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Old 03-22-2018, 05:19 PM   #1
Tripp
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1998 SL2
Default Saturn wont idle

1998 Saturn SL2, have replaced every part under the sun, has been running fine, suddenly it wont run unless I have it reved up, at idle it just chokes and cuts off. Started last night.

Have replaced catalytic convertor, TPS, fuel filter, among a ton of other stuff. Only thing I have not ever touched is the fuel pump.

20 years old, 235,000 miles

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Old 03-22-2018, 09:54 PM   #2
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2001 SL1
Default Re: Saturn wont idle

IAC (idle air control) value needs replacing.

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Old 03-22-2018, 10:16 PM   #3
fdryer
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2003 L-Series 3.0L Sedan
Default Re: Saturn wont idle

1998 Saturn SL2, 235,000 miles and you expect they pump to last forever? When in doubt, test. Borrow a fuel pressure gauge from AutoZone or Advance Auto. You might have to leave it connected to observe if pressure drops of dramatically when the whole p engine won't idle. Guessing is easy. Eliminating possible issues requires testing to remove all doubt.

Testing the idle air control valve is simple and described many times. The easiest test is to block off the port in the throttle body throat in front of the throttle plate with a normal (650-850 rpm) idle. The idle should drop to 500-600 rpm. Unblock the port and idle should jump up immediately then return to normal idle. The jump and return to normal idle is the PCM commanding the iacv to fully retract then extend to maintain idle rpm. You're blocking the supplemental bypass air port the PCM needs to control idle speeds. The iacv is metering airflow for electronically controlled idle rpm. If this doesn't occur, something's wrong.

Last edited by fdryer; 03-22-2018 at 10:26 PM..

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Old 03-23-2018, 07:45 AM   #4
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1999 SL2
2004 VUE 2.2L
Default Re: Saturn wont idle

Have you bothered to do a true cleaning of the throttle body and IAC valve and ports? If not do it. Odds are that is your issue.

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