What causes my engine to rev up and down?

If the engine can’t keep idling, it will keep trying to get the engine revved up to compensate. The cause of the erratic engine you’re experiencing could be a vacuum leak, sensor failure, or an EGR system malfunction.

What causes idle hunting?

Causes of a rough idle. Many different problems could result in a rough idle for your car or truck, including: dirty fuel injectors, clogged air filters, bad spark plugs, and a variety of exhaust system issues.

Is engine surging dangerous?

Surging and Lagging These surges occur because your spark plugs are not igniting the fuel in your engine at the proper rate, resulting in an uneven speed. This problem is a serious safety concern because, like engine misfires, it reduces the overall amount of control that you have over your vehicle.

Can bad spark plugs cause surging?

Weak Ignition from Damaged Spark Plugs Failing spark plugs can cause more than just surges or misfires. For instance, your car might sound rough when it’s idle. Not only that, but it can also cause you some problems when trying to start the engine.

Why does my Nissan engine not Rev over 3000 rpm?

So a little back round first. The engine has 10hours run time on it. Everything is pretty much brand new or reman. The issue is when driving when it hits 3000 RPM its like it hit a REV limiter. when in park again like it hit a REV limiter. When starting it take longer then it should to start (about 5sec of crank).

Why does my engine die at 3000 rpm?

The issue is when driving when it hits 3000 RPM its like it hit a REV limiter. when in park again like it hit a REV limiter. When starting it take longer then it should to start (about 5sec of crank). When starting from a light sometimes it will die, sometimes it will sound like it about to die (Like its REALLY bogged down).

Why does my Nissan Leaf not Rev over 3000 rpm?

The TPS is showing 0.4 Volt closed. If i check the right wires that is. (can someone confirm the wires I need to tap in to for this.) And the last thing, She is throwing a check engine code 11. I’m guessing the code is coming from start not the run cycle. since the code is the as soon as the key is turn to the “on” position

What kind of idle issue does Nissan EX35 journey have?

Car: 2008 EX35 Journey AWD Premium. Blue Slate/Wheat Idle issue & stutter solved! 1. Stuttering/low idle/near stall/stall when stopped in gear 2. Upon warm restart, engine idle would drop below 500 rpm and almost stall, 3. When cold, at light throttle input, a stumble/stutter around 1,700 rpm that almost felt like a transmission slip. 4.

Why does my car stall at low rpm?

The will likely force your computer to stall the engine and only allow it to run at low RPMs, which means the car will only move at slow speeds. This is a safety feature enforced by the computer so that your engine doesn’t get too damaged.