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94 saturn sl bad map sensor symptoms.

I've has a bunch of problems with the engine the past 6 months. Cleaned intake, new Idle air control,TPS,cooling sensor (the 2 wire for cooling fan and computer)and presure regulator. The engine runs great almost. something tnhat happens now that I know never happened before was when really cold and lately we've had a cold snap in Houston. when it starts it has a higher rpm around 1200 and as the engine warms it eventually goes down to about 900 which is still a tad higher than since I had it for 7yrs. Normal is around 8 to 850 or so. the reason I question the idle speed at cold because when it started to do it reminded me of a choke set up on a carburetor vehicle.What's going on now is and not always I be Idleing for a while say 900 and ther is a blip and the idle will jump to about 1200 and drop right back down to 850 or 900 rpm. when this happens I get a check engine light. When the engine gets turned off and restarted the Check engine is out until next blip. Just got a code reader and engine off ignition on code for high idle (hard Code)but just got this code reader so don't have the hang of it yet about reading code but do understand 12 which is normal for reading codes or something like that.A thought maybe MAP sensor. Everything that has been changed has been somewhat for the better but the systoms were not what Im experiencing now and all parts were original except the cooling sensor. any suggestions would be appreciated. If this blip happens during an inspection it will surely fail.

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  • Cars & Trucks Master
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Sounds like a bad Throttle position Sensor. When was the last time fuel filter changed. Start with cheapest parts first.

Posted on Feb 28, 2017

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Posted on Jan 02, 2017

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SOURCE: Po 108 fault code

Sounds more like a mass air flow sensor problem.

Posted on Jan 09, 2009

  • 181 Answers

SOURCE: Mitsubishi Mirage 94 at idle fails

It sounds to me like the ICM ( Idle control motor )

Posted on Mar 07, 2010

Testimonial: "I am in the process of this... changing the ICM, I ordered one from Ebay at 100 dollars (cost range from 250 to 350) BUT the gasket was not included."

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One of 4 things. Your TPS [throttle positioning sensor] IAC [ idle air sensor ] vacuum leak, or intake manifold gasket getting bad.Easy test for you to do before you get into replacing parts is as follows. Start car, and take some engine cleaner spray, and spray directly onto the gasket where the intake manifold bolts onto the block. Spray liberally. If you hear the engine RPM'S change in ANY way, your gasket is bad. These cars are well known for this. I suggest that you try this first and get back to me. If this is not it, I can walk you through the next easy tests. Let me know, but if I were a gambling man, I'd gamble on it being the intake gasket. $40, and 2 hours to do it yourself. I also made a video while I was doing my own. Let me know if this info is helpful

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1 Answer

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There are two sensors on the throttle body and a vacuum line. You'll see two harnesses going to the throttle body, one is the IAC.

However, a quick diagnostic check can be done without touching the throttle body to confirm your problem. If the car has a normal idle when initially started but then rises to a higher idle and stays there BUT then if you were to shut the car off and restart it and it comes back to normal that is the Throttle Position Sensor (TPS). This is also located on the throttle body (the other sensor to the IAC). If it is the IAC it will be high and maybe fluctuate a bit.

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