What causes engine hesitation and stumble problems on the 90 +?

Then it developed an intermittent hesitation problem- you would be cruising at 60mph, on a 400 mile trip, ease off the gas pedal, and suddenly for 1/4 second, it was as though someone had switched off the engine and then turned it back on again. The car would then run faultlessly for the rest of the trip.

Is the 4L60-E transmission a teardown or rebuild?

This is a video of a 4L60-E Transmission complete disassemble and rebuild. You will recognize the first half of the teardown, the rest I had misplaced it but found it, so I put it all together as one video as I intended to do a long time ago. And yes, it’s an old video. Loading…

Why does my 4L60E make a horrible noise?

Horrible noise in 4th and feels like the brakes are on: overrun clutches are applying due to a cracked or leaking forward piston. Overrun clutches will be worn out after 30 seconds of this behavior. Car can be safely driven in D. Transmission must be removed and rebuilt.

When to replace the accumulator housing on a 4L60E?

Check the yellow spring inside the accum housing for breakage. Also, if the accumulator housing walls are scored, the housing must be replaced. 4. 1-2 shift is delayed and harsh, may not shift into OD: TPS needs to be checked for smooth and linear electrical response over the entire range of motion. If not, this must be replaced. 5.

Why does my 4L60E have no reverse?

Slow, slipping or no reverse: “lo-reverse” clutches are worn out, fluid leak in the reverse apply circuit, or broken sunshell.

How much does a 4L60E transmission weigh?

The 4L60E Transmission has went through many changes/improvements over the years since it first came out in 1982. From bells to valve bodies, added solenoids, changes in pump and convertors. The 4L60E transmission weighs 146 pounds dry, and 162 wet.

How much fluid does a GM 4L60E need?

The 4L60E transmission weighs 146 pounds dry, and 162 wet. It requires 8.4 quarts (9.64″ torque converter) or 11.4 quarts (11.81″ torque converter) of transmission fluid, Below is a list of common transmission problems with the GM 4L60E Transmission and possible solutions to repair.

What causes a car to stumble at high speed?

Severe cases require professional cleaning equipment. Other problems that cause acceleration stumble include vacuum leaks, low fuel pressure, a weak spark caused by low coil voltage or bad coil (s), retarded ignition timing, and contaminated gas.

Why does my S10 jerk at steady speed / RPM?

I have a feeling my problems are caused by my exhaust (burning a little oil, muffler is 5 years/60,000 miles old, God knows how plugged my cat is). Basically, the problem could be caused by anything. I’ll get started on my list in the next couple weeks and keep checking in for more ideas.

Why does my Mitsubishi Starion have engine hesitation?

As another example, I still have a 1987 Mitsubishi Starion, which ran perfectly for 35,000 miles. Then it developed an intermittent hesitation problem- you would be cruising at 60mph, on a 400 mile trip, ease off the gas pedal, and suddenly for 1/4 second, it was as though someone had switched off the engine and then turned it back on again.

What causes poor acceleration in a Chevy S10?

There are many things that can cause acceleration problems in any vehicle. The internal combustion engine is so complex that even the slightest problem can potentially disrupt the power delivery in a very serious way.

What causes a Chevy S10 transmission to slip?

While many transmissions have the potential to begin slipping after many miles of use, it is pretty much assured to happen on older S10s with an automatic transmission. A slipping transmission is caused by parts starting to wear out, especially the gear teeth and the automatic clutch.

Why is the intake manifold weak on the S10?

The intake manifold gasket is notably weak on many S10 year models. While this not only can disrupt the air pressure and air flow of the intake manifold, which is not a welcome problem, it can also allow coolant to leak into the combustion chamber.

Why does my car hesitate when I step on the gas?

When you go to step on the gas pedal to accelerate, you will suddenly feel like the power has been lost in the engine for a couple of seconds. Instead of going faster by stepping on the accelerator pedal, the speed will be reduced. The vehicle may even stumble entirely during these seconds. This is what it means when the car engine hesitates.

Why does my GM Truck hesitate at low rpm?

From buying research to owner support, join 1.5 MILLION GM Truck Enthusiasts every month who use GM-Trucks.com as a daily part of their ownership experience. first the basics. I have a problem that is driving me nuts trying to figure out. at low rpm (truck in gear and moving) the truck hesitates, sometimes almost stalling out.

Why does my car run rough with no gas?

What I observed was that an engine can have quite a few things not functioning properly and still run- The fuel pressure regulator can be inoperative or the EGR can be non functional and you may not notice it, the exhaust gas sensor may not work , so the engine runs a bit rougher etc.

Why does my car hesitate when I press the gas?

So when the stoplight turns from red to green, you punch the gas pedal, hoping to sail through the intersection a little, um, faster than usual. But instead of moving when you hit the gas pedal, your car hesitates. Juuust long enough for every car behind you to honk, flip you the bird, or angrily swerve around you.

Why does my car hesitate when I open the throttle?

Engine Hesitates, Stumbles, Lacks Normal Power. The computer uses this information to determine how much fuel is needed to maintain the correct air/fuel mixture, and when extra fuel is needed if the throttle suddenly opens wide.

What causes hesitation and stumbling in a 1990 Chevy c1500?

An expert that got 10 achievements. Re: 1990 chevy c1500 hesitation and stumbling during… Based on what you said, I would say the engine is starving for fuel. The computer has to be disabled to set timing – there should be a procedure for that. I would start with checking fuel pressure at the throttle body.

Why is my Chevy Suburban bogging down on hard acceleration?

I have a 97 Suburban 5.7, 2wd. On hard acceleration it is bogging down like there is to much air, because sometimes it backfires. Or a plugged exhaust. I replaced the fuel pump-because it was bad in July.

When does Chevy Silverado 1500 engine hesitate during acceleration?

Chevrolet Silverado 1500 Engine hesitates during acceleration Inspection at your home or office. Our certified mobile mechanics come to you 7 days a week between 7 AM and 9 PM.

Why does my Buick Lucerne engine hesitate during acceleration?

A vehicle with a combustion (gas or diesel) engine requires an exact mixture of fuel and air to run efficiently. If this mixture is thrown off in any way, it may result in an engine running too lean (not enough air), or too rich (not enough fuel).

What causes a car to hesitate when accelerating?

A vehicle that hesitates while accelerating or while driving up a hill may have a weak fuel pump. Throttle position sensor: A throttle position sensor tells the vehicle’s computer how far the throttle is open and how hard the accelerator is being pressed.

Why does my Buick Enclave hesitate when accelerating?

It can be frustrating for any driver to expect certain acceleration from their vehicle only to find that the vehicle seems to be hesitant while speeding up. This hesitation could be potentially dangerous in situations like entering and exiting the highway from an off-ramp, where acceleration may be necessary to merge with traffic.

What does it mean when your engine hesitates under load?

An engine that hesitates, stumbles or misfires when accelerating or when it is under load, is an engine that is either sucking too much air, not getting enough fuel, or misfiring. If the Check Engine Light comes on, you may find any of the following codes: P0171, P0174 Lean fuel condition codes P0120 to P0124 Throttle position sensor codes

What causes engine hesitation when using a timing light?

This systems can cause hesitation when maladjusted, by using a timing light this situation can be checked and corrected. If the timing is adjusted too far retarded (behind the timing mark) in relationship to the engine crankshaft it will cause hesitation.

What causes car engine to hesitate when accelerating?

The exhaust gas recirculation valve, or EGR valve, may be damaged and causing a leak. This is known to cause engine hesitation problems, so it should be addressed. If you are using bad fuel which is has been sitting in your tank for too long or is too low of an octane for your engine, it can cause many different problems.

What does it mean when a car engine hesitates?

This is what it means when the car engine hesitates. It is usually the result of a problem with the air and fuel mixture within the combustion chamber. However, there is a long list of other reasons which could be the cause of this hesitation problem too.

What causes a car engine to stop working?

Repair or replace any hoses which are causing the leak. If any of the components in your fuel system stop working correctly, like your fuel injectors, fuel pump, or fuel pressure regulator, then your engine won’t get the proper amount of fuel it needs for combustion.

What should I do if my car hesitates when I press the gas?

Here’s what you might discover—and what you can do to fix the problem: Dirty air filter. The Fix: Replace the air filter. The spark plugs may be dirty or worn. The Fix: Replace spark plugs. The ignition wires may be bad. The Fix: Inspect and replace ignition wires. Ignition system problems. The Fix: Check distributor cap or rotor.

What causes an engine to overheat in an old car?

An engine that is running lean may be hesitating. A too-lean condition may also cause overheating, and prolonged operation will cause engine failure – at minimum, burned valves with the added possibility of burning holes in pistons.

Why does my Toyota Corolla hesitate during acceleration?

When a vehicle is hesitating during acceleration, it should be inspected by a mechanic. A vehicle with a combustion (gas or diesel) engine requires an exact mixture of fuel and air to run efficiently. If this mixture is thrown off in any way, it may result in an engine running too lean (not enough air), or too rich (not enough fuel).

Why does my car hesitate when I hit the gas?

Whenever you took off from rest, the harder you jumped on the gas pedal the deeper and longer the hesitation. At higher revs the engine seemed to be a slightly down on power. Thinking the problem was related to vacuum, fuel delivery and improper fuel air ratio, I spent a lot of time looking at things in this area, but how completely wrong I was.

What causes engine hesitation on a Dodge truck?

The engine hesitation on your Dodge may be created by problems in one or more components. In most cases, a bad throttle position sensor (TPS) fails to signal the engine computer about throttle operation. Other causes may be bad or worn out components in the ignition secondary system, causing the engine to accelerate poorly and even stall.

Why does my Dodge engine stall when I start the car?

Other causes may be bad or worn out components in the ignition secondary system, causing the engine to accelerate poorly and even stall. These steps will help you inspect these components and solve the hesitation problem on your Dodge vehicle.

What should I do if my check engine hesitates?

Protective eye wear and gloves. Begin by parking the vehicle on level ground, in park with the emergency brake on. The engine will be running in many of these tests so use necessary safety precautions. Step 1 – If a malfunction has occurred that the computer has realized, the check engine or service engine soon light will be illuminated.

What happens when you hesitate at the throttle?

5) While driving at normal road speeds (after the hesitation) or accelerating and the throttle is not fully closed, there is no miss whatsoever, and the engine performs very smoothly. While ever the throttle is partially or full open, the engine performs very smoothly and with normal power, apart from the initial hesitation.

What was the problem with my 1990 Na?

Power steering dropped out, but luckily I was able to bring the car to a stop just in time to avoid smashing into the footpath (sidewalk). Started the car again, and you know, this problem has never happened since. The problem I had was with my 1990 NA, which had mysteriously developed a deep hesitation whenever the car moved off from rest.

How to troubleshoot a car engine temperature gauge?

Touch the positive lead from your meter to the reference supply wire. You should see 5 or 12 volts with the ignition key in the “On” position, depending on how your vehicle is designed. Proceed to the next step, if you receive a voltage reading. If you do not get a reading,…

Why is it when driving the RPM gauge drops or jumps up?

Somewhere the fuel drop then suddenly rpm decrease better check the complete fuel system from tank to injectors also check the rpm sensor . Was this answer helpful? This could possibly be your output speed sensor, related to the transmission.

What causes engine hesitation when fuel meter is set?

The (MAF) sensor monitors the amount of air entering the engine. It then sends that information the engines computer, so it can set fuel metering accordingly. A stuck or failed (MAF) sensor will throw these readings off, and may result in stumbling and hesitation.

What are the symptoms of a bad fuel gauge sender?

Usually a bad or failing fuel gauge sender will produce a few symptoms that can alert the driver of a potential issue. 1. Fuel gauge behaves erratically One of the first symptoms of a problem with the fuel gauge sender is a fuel gauge that behaves erratically.

Engine hesitation can make your vehicle seem like its; bogging down, misfiring or stumbling when you hit the gas pedal. When you step on the gas pedal; you will suddenly feel like the power has been lost in the engine. Consequently, After the engine hesitation it goes back to normal; but it may take a second or two to respond.

When does Ford E-150 engine hesitate during acceleration?

Ford E-150 Econoline Engine hesitates during acceleration Inspection at your home or office. Our certified mobile mechanics come to you 7 days a week between 7 AM and 9 PM. Our certified mobile mechanics can come to you now. received a Engine hesitates during acceleration Inspection.

What was the cause of the stumble engine?

As with engines before the days of Electronic Fuel Injection (EFI), stumble had two basic causes- incorrect ignition and incorrect fuel/ air mixture for the required operating condition.

Can a faulty EFI cause an engine stumble?

With computer controlled EFI, the computer or any of its sensors or actuators can go faulty, and when this happens you can get, you guessed it- incorrect ignition and incorrect fuel/ air mixture for the required operating condition, thus engine stumble. Here is the list of items on the 90+ that can be sources of this problem (no particular order):

As with engines before the days of Electronic Fuel Injection (EFI), stumble had two basic causes- incorrect ignition and incorrect fuel/ air mixture for the required operating condition.

Can a bad throttle position sensor cause idle surging?

Idle surging can be caused due to other issues in the car, but if it happens in conjunction with other throttle position sensor symptoms, the culprit is often the TPS. At idle, the ECM will not get the correct information and the throttle will variate randomly causing idle surges. 3) Check Engine Light

How to troubleshoot a hesitating or bucking car?

Step 1: Physically inspect the fuel filter. If the fuel filter is dirty like the image on the right, it’s probably causing a restriction of fuel flow to the engine and should be replaced. Step 2: Check for leaks coming from fuel filter connections. The fuel line is spliced between two fuel lines.

Why does my AC quit working on my Ford E-450?

Normal operation. When the load or the throttle position reaches a predetermined point the AC compressor will automatically shut off until the load or the throttle backs off then it will kick back in. 5 people found this helpful. So, I’ve also had this problem in an E-450 can on my class C motor home. Took it to Ford.

Why does my car stumble when I Turn on the ignition?

3 Basic Causes of Stumble As with engines before the days of Electronic Fuel Injection (EFI), stumble had two basic causes- incorrect ignition and incorrect fuel/ air mixture for the required operating condition.

What causes an engine to surge during a tune up?

Step 2 – An engine’s tune up is a regularly scheduled service, when this service is neglected it can cause the engine to surge. Learn more Step 3 – If a fuel pump or regulator is failing is can cause an unsteady volume or pressure for the fuel system causing the engine to surge. Learn more

Why is my car surging at idle speed?

When an engine’s computer can “hunt” or “surge” at cruising or idle speeds it is searching for program compliance, there is a problem elsewhere in the system.

Can a vacuum line cause an engine to surge?

Learn more Step 5 – If a vacuum line has caused a leak the engine will surge, as vacuum lines age they can become brittle and fall off the engine or accessory. Learn more Step 6 – If an air intake boot becomes torn and develops a leak it will cause the engine to surge.

What was the top speed of a 1989 Thunderbird?

A stock SC could do 0–60 in 7.5 seconds and the quarter-mile in the mid-15s at about 90 mph, impressive for a two-ton car in the mid 1990s. Top speed was about 140 mph. Road & Track wrote, “… the 3.8 puts power to the rear wheels with the smoothness of a monster electric motor.”

When did the Ford Thunderbird SC come out?

Ford built about 58,000 Thunderbird SCs; 1990 was the best sales year at just under 22,000. Kreisz’s ’92 SC, which he bought in 1994 as a daily driver and later modified for higher performance, is one of three he owns.

What was the year of the 1990 Thunderbird?

He also has a 16,000-mile 1990 Thunderbird 35th Anniversary Edition with a five-speed and a 1995 five-speed model with 105,000 miles. His Anniversary car was part of a special Thunderbird display at Carlisle in 2015.

How much horsepower does a Thunderbird SC have?

The Thunderbird SC’s 3.8-liter supercharged V-6 made 210 horsepower and 310 lb.-ft. of torque, later upgraded to 230 hp / 330 lb.-ft. Some SC parts are scarce. Kurt Kreisz

Why does my car struggle to go up hills?

Once you start experiencing low cylinder compression, your vehicle will always be struggling on an incline because the engine power won’t be strong enough to push it up there. If you start to have acceleration problems as you attempt to drive uphill, do not slam down on the gas pedal to try to get up the hill.

What causes a car to lose power on a hill?

If the fuel pump is on its way out, it may work intermittently or not at all. A symptom of starving the car for fuel is a car that runs correctly at idle and low load, but falls flat on its face as you ask for more power (when climbing a hill, for instance). Fuel pumps may fail due to age, sediment buildup, or running the incorrect fuel.

Is it dangerous to drive a car uphill?

You may be able to drive slow on flat roads but once you get to an uphill road, you likely won’t be going anywhere fast. A clogged exhaust can be dangerous, as it is a fire hazard in extreme cases. If you think your exhaust may be clogged, the issue should be addressed as soon as possible.

How to solve engine hesitation and stumble problems?

One way is to divide the problem into 2 parts- one which involves locating “conventional ” faults and the other deals with the computer controlled aspects. Conventional fault tracing involve basic checks such as vacuum leaks, bad fuel, wiring faults, and worn or fouled spark plugs, loose alternator belt or faulty alternator.

Is there a hesitation problem in a 1999 Legacy wagon?

1999 legacy wagon 2.5-same exact problem everyone else is having, saw this thread and thought yes! Work in an all make shop and have seen tons of weird problems caused by bad grounds. Gotta start with the basics, which we often forget!

Why does my Ford Taurus stall at idle?

Problem With Idle Air Bypass Valve May Cause Engine Performance Problems Engine Stalling and/or Hesitation on Acceleration due to Faulty Idle Air Bypass Valve on Ford Taurus Problem Description

What is the trouble code on my Taurus?

I have a 1995 Taurus that is giving me trouble codes 543, 211 &212. The cars symtoms are after initial crank the car does run slightly erratic but … read more

What are the problems with a 1994 Ford Thunderbird?

Most problems show up after a short drive (1/4 mile to 1/2 mile), stop then no restart after 20 -40 min rest, or … read more 1994 Ford Thunderbird SC – Car won’t start, drove it to work with no problems, 8 hours later it turns over, but won’t start.

What’s the cost of a Ford Taurus idle valve?

This valve helps the vehicle idle steady when the accelerator pedal is not pressed. The average cost for a Ford Taurus Check Engine Light Diagnosis & Testing is between $88 -$111. Learn More My Taurus want stay running unless I keep my foot on the gas.

Why does the transmission of my car hesitate?

Here are a few common reasons why your transmission may shift erratically, jerk or hesitate. There’s an old adage when troubleshooting: start with the least expensive and simplest fix. In this case, check the transmission fluid level first. Low fluid can prevent the transmission from shifting properly.

A bad TPS can easily cause jerking hesitation, since the computer thinks you’re rapidly opening and closing the throttle. If everything in the world seems to be going wrong at once, check your engine and frame’s ground straps and the battery connection. A bad ground will cause everything to act up, including the computer.

Why did my 1991 TT engine cut out?

With my 1991 TT, last year I was on a 400 mile trip with about 50 miles to run. I decided to pull over in a small town for a break. As I was part way through a U turn, doing about 5 mph, the engine stumbled and cut out.

When does your car hesitate at 45 mph?

I started getting a hesitation/bucking in my 2001 F150 SCREW 5.4L 96,000 miles. It does it most often when you are barely on the gas at 45 to 50 MPH and then you press the gas to accelerate. It hesitates for a second and then takes off.

What kind of car loses power at highway speed?

2003Nissan Altima 2.5s…. while driving at highway speed {60} the car lost all power and died and all dash lights went off. A second or two later all the lights on the dash and headlights as well as radio came back on. I tried to put it in neutral and restart it while it was coasting but the starter wont engage to try and start motor.

Why is my Mitsubishi Triton surging at 60K?

Anyway I took it back to the dealer and they explained that at the 60k service the fuel filter is changed. The filter is smaller than the position it sits in and expands to fit after running the engine for 20sec to a minute due to diesel flow. Unfortunately that means unfilters fuel gets past for at least 20sec maybe more.

What causes engine to hesitate at low rpm?

If any of the vacuum hoses around your engine become damaged or worn out, you could experience air leakage from them. Then you will experience engine hesitation which is most noticeable at low RPM. Repair or replace any hoses which are causing the leak.

When did my Triton glxr start surging at 100km?

I purchased a brand new Triton GLXR in 2010, it started to surge at around 60,000km particularly when it reached 20000 rpm at 100km. I have just had my Triton in for a fourth time, to rectify the same issue of surging and I am not totally convinced the surging has been fixed this time.

Do you always hesitate when running rougher?

It will not always buck or hesitate once it runs rougher, but it will ONLY do it after the load, sound, and running rougher have started. Dealer has rebuilt transmission, put in new timing chains, other diagnostic work.

What causes a car to hesitate at 45 mph?

Basically – part throttle, light load, slight grade or hill. 45 to 60 mph Engine will start getting to wear it is working, starts to sound “different” and run a bit rougher, then it will buck or hesitate. It will not always buck or hesitate once it runs rougher, but it will ONLY do it after the load, sound, and running rougher have started.

Why is my Great Lakes 4×4 running rough?

Also, when you idle the ammount of air and fuel mix is small, less air = less fuel needed for lower engine speed. While your engine is getting more air (vacuum leak) and this little bit of fuel that is being dumped at idle is not enough to creat proper combustion, and could cause your rough running condition.

What should I do if my engine is surging?

There may be a fault in the computerized engine control system. Check engine control systems with a scan tool. Have a mechanic test the circuits and repair or replace components as required, since this is generally not a DIY job. The fuel filter may be partially clogged. This is an easy fix! The fix: Replace the fuel filter.

What’s the problem with my Chevy truck hesitation?

This is a very tricky problem to diagnose, and there could be a number of causes, which I go over in the video. It could be as simple as a clogged fuel filter, which would cost $20 to fix. Or it could be a very expensive fix it like a catalytic converter or a fuel pump.

Why does my GMC Sierra 1500 stall at high RPM?

At higher rpm seem almost like the exhaust is clogged but the cat has been bored, itll rev up but just wont really go. Today experienced a poping sound almost like a backfire from underneath. After the truck starts and is warm at a stable idle in park/neutral it’ll rev up fine.

How much does a GMC Sierra engine hesitate during acceleration?

Our certified mobile mechanics come to you 7 days a week between 7 AM and 9 PM. Our certified mobile mechanics can come to you now. GMC Sierra 1500 HD Engine hesitates during acceleration Inspection costs $89 on average.

Why does my Chevy truck sputter when I accelerate?

The engine starts and runs fine, when I leave for or from work. But when I accelerate out of the parking lot it hesitates and really sputters. If you try to accelerate more it backfires a few times and then takes off like there’s nothing wrong.

What causes engine hesitation and stumble problems on the 90 +?