1995 Ford Contour Car dies occasionally at idle and loses p

Hello nappinkat\

Welcome to 2carpros.com


You probably have a vacuum leak or fuel delivery issue.

An EGR valve that is stuck open at idle can have the same effect as a vacuum leak
Or a loose PCV hose.you can use a carb cleaner or propane to check suspected vacuum leak around the intake.
The important thing to keep in mind about vacuum leaks is that they have the most noticeable effect at idle. At part and full throttle, there is so much air entering the engine that a little extra air from a vacuum leak has a negligible effect.
If you have a scan tool, look at the Short Term Fuel Trim (STFT) and Long Term Fuel Trim (LTFT) values. Normal range is plus or minus 8. If the numbers are +10 or higher for STFT and LTFT, the engine is running LEAN. If you rev the engine to 1500 to 2000 rpm and hold it for a minute or so, and the STFT value drops back down to a more normal reading, it confirms the engine has a vacuum leak at idle. If the STFT value does not change much, the lean fuel condition is more likely a fuel delivery problem (weak fuel pump, restricted fuel filter, dirty fuel injectors or a leaky fuel pressure regulator) than a vacuum leak

Thanks for the quick response. This only happens when the car is run for a little while and it is intermittent. I was told to look at the IAC ?? Could that be the problem?It idles fine when I start it. Then all of a sudden I will be with my fooot off of the gas and the idle drops abruptly. I hope this makes sense.Thanks!

Hello nappinkat

If your engine is idling too fast, too slow or stalling, the problem may not be the idle speed control system, but an engine vacuum leak. Check for vacuum leaks first to rule out this possibility.
A common condition is to find the idle air bypass solenoid extended all the way out (closed). This usually means the engine has an air leak and the PCM is trying to bring the idle speed back down by closing the idle air bypass circuit. If there is an open or short in the idle air control solenoid, Wiring or driver circuit, or the idle speed is out of range, it will usually set one or more fault codes and turn on the Check Engine light. If the light is on, you need to plug a scan tool into the diagnostic connector and read out the codes that set the light.
The diagnostic procedure involves disconnecting ISC motor, then starting the engine to see if the idle speed increases (it should). Turn the engine off, reconnect IAC and start the engine again. This time the idle speed should return to normal. If it does, the problem is not in the IAC circuit or motor. Check for vacuum leaks or other problems that would affect idle speed.

I will try these things and let you know. Thanks!

you're welcome.