Q: Q: Car wont stay running

asked by on

ok car will start fine for about 2-3 seconds then will start shaking and dies, i check fuel pressure is ok, coils are ok, wires are new, spark plugs are ok, timing is ok, what can be the cause no cel on, also i was having trouble with the transmission but do u think that has something to do with it thanks

My car has 180000 miles.
My car has an automatic transmission.

It sounds like you may have a sticky or faulty idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle. This valve is controlled by the vehicle’s computer and will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage. This is also an important function when starting the motor as it allows the motor to run and idle on it’s own once the motor fires. When you accelerate, the engine RPM increases, and as you let off the gas, the RPM slowly returns to the normal idling speed with the help of the idle air control valve making the transition from a higher RPM back down to idle speed while adjusting the air/fuel ratio constantly to allow this to happen smoothly. When the engine RPM drops below the normal range of about ~800 RPM, this often times will cause the engine to stall indicating a dirty or faulty idle air control valve. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your vehicle.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Q: Car wont stay running

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Toyota Celica GT 1983 - Knocking noise when car is moving forward, gets louder and faster as the car gets faster.

The first thing to do is get out your lug wrench and be sure all of the wheel bolts are tight if you don't find anything that way, your problem could be in the brakes somewhere or even a bad...

Q: Car accelerates without me pushing the pedal

The very first thing to do is to make sure the floor mat in the floor is not out of position and causing the gas pedal to be touched by the carpet or floor mat. If mat is deformed then...

Q: How much to replace intake manifold gasket on 1999 chevy astro van 4.3 engine?

On your model, it probably takes around 4 hours to replace both the upper and lower intake manifold gaskets but if you have rear A/C it is somewhat longer. A gasket kit is necessary because other gasketed parts are removed...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...