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Re: car idle high
Zab, You will need a "scan" tool to read the codes. There are several after market shops the will do this for you free. Auto Zone and others will want to sell you their parts so will pull codes for you.
Let me know what codes you find.
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I have had this happen on saturns before and it has turned out to be a bad intake gasket. The gasket cracks allow extra air to get into the engine causing it to idle high. It also will normally have the check engine light come on indicating a cylinder misfire. 4 thumbs up is appreciated if this helps
The Check Engine light will light when the ECU stores a trouble code.
Counting the Flashes
To retrieve trouble codes, turn the ignition key to the "on" position with the engine OFF.
The Check engine light will flash many short blinks. The total number of blinks equals the code number. For example, flash,pause, flash,flash = code 12.If more than one code is stored, the Check engine light will flash the codes in sequence (lowest to highest) with a pause between each code. The codes will repeat until the key is turned to the OFF position.
Transaxle codes present
Diagnostic check only
Oxygen sensor circuit
Coolant sensor/high temperature
Coolant sensor/low temperature
PCM fault - pull-up resistor
6X signal fault (92-95 models)
Throttle position sensor-voltage high
Throttle position sensor-voltage low
IAT circuit low
VSS circuit-no signal
IAT circuit-Temp out of high range
Quad driver output fault
EGR system fault
MAP sensor - voltage out of range high
MAP sensor - voltage out of range low
IAC - rpm out of range
Ignition control circuit-open or shorted
Bypass circuit - shorted or open
IC control circuit grounded/bypass open
Knock sensor circuit shorted or open
O2 sensor indicates lean condition
O2 sensor indicates rich condition
Power steeringpressure circit(91 models)open or shorted
High idle indicates vacuum leak
PCM memory error
System voltage error
trans fluid temperature too high
Trans fluid temperature too low
A/C pressure sensor
ABS message fault
PCM internal communication fault
You either have a bad engine coolant temp sensor & connector.Located under upper radiator hose at cylinder head Yellow & black wire.Original sensor is ceramic & replacement will be brass from saturn.Also you may check for vacuum leaks at PCV hose & valve.Hope this helps
Zab, First things first, check for any vacuum leaks, hoses that are disconnected, cracked or just plain worn out. Also check for vacuum leaks around the throttle body.
It really sounds like you have an EGR valve that is stuck open ever so slightly. The MAP sensor is a result of a low manifold vacuum. The IAC (idle air control) motor is trying to compesate and keep the engine running resulting in the high idle speed. I would remove the EGR valve and clean it gently with a brush and pick to remove any carbon build up.
Let me know, regards.