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99 saturn races at startup, almost dies at idle

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It's the iac solenoid, ( idle air control solenoid ), try to tap on it if it idles when you do that then replace it

Posted on Dec 09, 2016

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Posted on Jan 02, 2017

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99 Isuzu Trooper RPM keeps racing! These sensors have been replaced; TPS, IAC, CTS, no Vac. leak. The RPM still races at normal operating temp. What sensor tells the computer the RPM of the engine?


redux1
after many posts, we see only 1 clue engine
MAF
the 6ve1 engine
that told me what engines. one word, mAF.
if just one MAF (no map)
so all air leaks are slow rpm caused by lean
but if pcm goes in to limp home mode.
it car race, due to loss of IAC controls
the engine does not run like you think
the CMP/Cke sensors,
if they die , the engine dies.
if they misfire, the engine misfires and slows and stalls'

are you using good scan tools real that see all factory codes. p1, p2xxx?
not just fedcodes, p0xxx?

the 3.5v v6 has a MAP and a MAF BOTH.
on some engines like this, the Map is for idle
and the mAF of for fast.
fooling many machanics
dual mode systems,
the MAF sensor is not very accurate at idle
is the reason for the dual mod
so vacuum leaks, I SAY.

Mar 01, 2017 | Isuzu Cars & Trucks

1 Answer

How do I adjust to lower my racing idle on my 1994 Saturn Sl2 ?


Make sure no hoses came undone...and u can try a idle relearn procedure to start off with..may b coincedental that something may have went out of sack w hits

Sep 17, 2014 | 1994 Saturn Sl

1 Answer

99 saturn loud revving sound in engine


Start the car and use a spray bottle to spray a bunch of water mist around the top back of the engine where the intake meets the head. If it starts to die you have an intake manifold leak. It\'s kind of a pain to change, but not really technical. Also, clean your throttle body and clean the idle air controller (IAC). Alos consider replacing the Throttle position sensor (TPS). Both are located on the back of the throttle body.

Dec 02, 2012 | 1999 Saturn SL

1 Answer

Engine Problem


first thing that comes to mind would be the throttle positioning sensor, or the mass air flow intake sensor on the air intake hose assembly.Symptoms of a mass airflow intake sensor would be very poor acceleration or engine dying when gas pedal is mashed hard. Throttle positioning sensor can give you and irradical idle while sitting still. You might want to have a scan to diagnose the problem.

Nov 24, 2011 | 1998 Saturn SL

1 Answer

My car is a 1999 Saturn SC1. The engine races and takes a looong time to return to idle, and only fully returns to idle when the car stops. And the Service Engine Soon light is on. I'm pretty mechanical;...


mcdevito75 here, You can check the cold idle switch or if equipt the idle speed motor, Where they are exactly is ?? try to contact a Saturn Dealership or auto parts store.

Nov 21, 2009 | 1999 Saturn SL

1 Answer

Trouble starting, engine won't catch


Try pulling the engine coolant temp sensor, They often crack not sure why but the ceramic tip cracks makes the car hard to start, the car's idle may race while shifting gears, and often smokes. The sensor is on the right side of the engine when looking at it on the head. Easy to change and get too

Jan 16, 2009 | 2001 Saturn SC

1 Answer

I have a 2001 Saturn SL2. I have to keep my foot on the gas pedal until it warms up or it dies and now the service engine soon light is on. Can you help me with this? Thanks Debbie


Try pulling the engine coolant temp sensor, They often crack not sure why but the ceramic tip cracks makes the car hard to start, the car's idle may race while shifting gears, and often smokes. The sensor is on the right side of the engine when looking at it on the head. Easy to change and get too

Dec 23, 2008 | 2001 Saturn SL

1 Answer

1989 Jeep Idle Races at startup


yes its the iac "idle air control" they go bad also loose batt conections cause this problem good luck

Sep 20, 2008 | 1989 Jeep Cherokee

2 Answers

Engine shuts off when it gets warm


Try crank position sensor, it's common for those to stop working when they heat up

Jun 09, 2008 | 1999 Saturn SL

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