How big should the vacuum be on an Acura MDX?
Start by checking engine intake vacuum. Connect a vacuum gauge to a vacuum port on the intake manifold. Start the engine and note the vacuum reading. On most engines, intake vacuum should be steady between 16 and 22 inches.
Why does my Acura MDX idle too fast?
The powertrain control module (PCM) will maintain normal idle speed and compensate for a small vacuum leak by closing down the throttle body air bypass. But if the leak is too large and the idle control system cannot compensate for the extra air, the engine may idle too fast.
What happens when you put propane in an Acura MDX?
The resulting “correction” in the engine air/fuel ratio should cause a noticeable change in idle speed and/or smoothness (Note: you may have to temporarily disconnect the idle speed control motor while doing this test). Use caution because propane is highly flammable and can be ignited by a spark or flame.
Where can I find the misfire code on my Acura MDX?
If a misfire is occurring in only one or two cylinders, you will usually find a misfire code for that specific cylinder rather than a random misfire code. Start by checking engine intake vacuum. Connect a vacuum gauge to a vacuum port on the intake manifold.
Start by checking engine intake vacuum. Connect a vacuum gauge to a vacuum port on the intake manifold. Start the engine and note the vacuum reading. On most engines, intake vacuum should be steady between 16 and 22 inches.
The powertrain control module (PCM) will maintain normal idle speed and compensate for a small vacuum leak by closing down the throttle body air bypass. But if the leak is too large and the idle control system cannot compensate for the extra air, the engine may idle too fast.
The resulting “correction” in the engine air/fuel ratio should cause a noticeable change in idle speed and/or smoothness (Note: you may have to temporarily disconnect the idle speed control motor while doing this test). Use caution because propane is highly flammable and can be ignited by a spark or flame.
If a misfire is occurring in only one or two cylinders, you will usually find a misfire code for that specific cylinder rather than a random misfire code. Start by checking engine intake vacuum. Connect a vacuum gauge to a vacuum port on the intake manifold.