Question about 2002 Saturn S-Series

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Engine reving very high, not the air idle, or throttle position

1.9l idles high, I change the aic and tpcensor and the throttle body itself, but still revs high. Could it be a bad EGR?

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You have a vacuum leak

Posted on Dec 29, 2012

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Posted on Jan 02, 2017

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No, its the intake manifold gasket.  This is a very common problem with the SL/SL1 engine.  There are only three bolts around the #1 cylinder and no bridge in the block between #1 and #2 cylinders.  The flexible factory gasket tends to pull out in this area.
A confirmation of this is to spray some carburetor cleaner, fuel injector cleaner or even WD40 on the gasket around the #1 cylinder and if it affects the idle in any way, its because its leaking.
Felpro makes a good replacement gasket.

Posted on Nov 22, 2008

  • 39 Answers

SOURCE: 1999 saturn sl1 rough idling

a pit\ston might not be working properly

Posted on May 29, 2009

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SOURCE: 98 Saturn SL2 - Stalling issues

DTC P1635

The 5 volt reference circuit provides a signal voltage to the linear EGR, MAP sensor, and TP sensor. The return line is grounded through the PCM. DTC P1635 detects a short to ground in any of the 3, 5 volt reference circuits or inside the PCM.

Conditions for Setting the DTC

The 5 volt reference is monitored whenever the ignition is ON.

DTC P1635 will set if the 5 volt reference signal is below 3.5 volts or above 5.5 volts. This voltage is monitored internally by the PCM.

Diagnostic Aids
If DTCs P0563, P0108, P1106, P0452, P0453, P1122, or P0122 are set, a short to B+ on the 5 volt reference circuit is probable. If the short exists while attempting to diagnose, PDT communications will be lost and driveability conditions will exist.

Posted on Jun 24, 2009

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2 Answers

Over reving

Can be a number of things (check all of these):

  1. Stuck throttle linkage or accelerator pedal;
  2. Loose butterfly on throttle body;
  3. Stuck or malfunctioning idle air controller;
  4. Loose or damaged throttle body or bad throttle body gasket;
  5. Cracked intake manifold or bad intake manifold gasket;
  6. Bad ignition control module.

Jun 24, 2014 | 1994 Eagle Summit

1 Answer

Where is the aic on a 94 sierra

Its located right on the throttle body. If your talking about the air intake temp sensor, thats mounted by the air filter or in the plastic tube that goes off the throttle body to the air box, its a 2 wire hook up. The idle air control "iac" is located on the throttle body side. "iac" idle air control. "ait" is air intake temp. 2 totally diff sensors.

Feb 20, 2013 | 1994 GMC Sierra

1 Answer

2002 saturn sl1 rough idle,misfire,popping sound from exhaust. replaced fuel pump,fuel filter,plugs and wires no help

My 02 did the same thing. If I were you I'd first check for vacuum leaks and check the intake manifold gasket. They are known to go bad.Take engine cleaner, or brake cleaner and spray directly onto the intake while the engine is running. This is right under the fuel rail. Spray and listen for a change in the idle. If there is any change at all, the intake manifold is bad. Spray all vacuum hoses too. If that is not the problem you should clean the TPS throttle positioning sensor, and the AIC air idle control. Also clean the throttle body. These cars are known for this too.. First take off air cleaner hose, and disconnect the battery. On the throttle body TB you will see 2 10mm bolts. Undo them and the throttle cable. Don't lose the metal gasket. Take TB off and look at the back side of it. Is it carboned up? If so, clean with same cleaner making sure the 2 vacuum hoses are clear. Take the AIC off with a #20 torx screw driver. Dont lose the rubber O Ring. Clean it up, but dont try to move the plunger. Clean inside the TB where this plunger seats. Dirt can cause your symptoms. Clean it up good scrapping the carbon off the back of TB. The TPS is right above the AIC and can also be cleaned up a bit. put it all back together and it should run right.It's usually one or the other with these engines, please let me know what your test results come up with thanks

Jan 21, 2013 | Saturn SL Cars & Trucks

1 Answer

Engine reves up and down. have spayed carb. cleaner around trying to find a vacum leak, none found/ Please help!

you have a bad idle air control valve it is located to throttle body next to the throttle position sensor

Dec 07, 2012 | 1998 Saturn SL

1 Answer

High idle after new throttle body

No, a idle sensor is an electrically-operated valve which allows air to bypass the throttle plate in a fuel injected engine to regulate idle speed. The throttle body sensor is used to monitor the position of throttle in internal combustion engine.-----------------------------------------------------------------------
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Nov 23, 2012 | Cars & Trucks

1 Answer

High idle o n a 1996 chrysler concorde. have change the tps and the idle air control valve. i think its a vacum line but i dont know which one. which one s effect the idle

High idle is usually caused by a vacume leak. First place to check is the cold air intake manifold. All hoses, throttle body, and sensors. Throttle Position(TPS), Mass Airflow(MAS), Idle Air Control Motor (valve) IAC. Controls Idle speed

A malfunctioning throttle system can cause both a high idle as well as an engine stall.

A dirty air intake or cracked air intake tube is often the culprit.

How to Fix an Engine High Idle in Under 15 Minutes

Oct 16, 2011 | 1996 Chrysler Concorde

1 Answer

I change the oil in my isuzu redeo and now it reves up high

Technically, there is no connection between an oil change and the vehicle's rpm settings. However, a disconnected vacuum line could affect engine idle. Even a loose oil filler cap can introduce air into the crankcase and pcv inlets. Please make sure that no vacuum hoses are cracked and/or disconnected. Try to "backtrack" and make certain that all electrical connectors to the idle air control motor and throttle position sensor were not loosened accidentally. Finally. check the accelerator cable linkage to the throttle body to make sure that the cable is not hung up.

I hope this helped,

Have a great day !!!

Apr 08, 2011 | Isuzu Rodeo Cars & Trucks

2 Answers

Where to locate and clean throttle body

TBI is the part where the plastic duct coming from the air filter housing mates the engine. The part where the clamp attaches on the engine side is the TBI. The TBI has attached the Throttle Position Sensor TPS and the Air Intake Control Valve AIC,
A HELPFUL - 4 THUMBS - rating for this solution would be greatly appreciated. Thank you for using FixYa.

Nov 09, 2010 | 2008 Mercury Mariner

1 Answer

Will not idle but will stay running if under load. I changed the TPS but only changed the idle for about ten minutes. Please help im lost

Sounds like the AIC (Air Idle Control) motor might be bad or stuck in the closed position not allowing enough air to enter the engine at idle. Also when you changed the TPS you need to make sure that it is set for 0 deflection, if not the same will occur because the computer won't know that the throttle is at idle and will close the the AIC thinking you have you throttle depressesed.

Sep 15, 2010 | 2002 Jeep Grand Cherokee

1 Answer

Idol runs fast after starting vehiicle

the idle air control valve is stuck,or there is a vacuum leak.check the vacuum lines,the throttle cable is not sticking and the idle control valve which is on the side of the throttle body and the throttle position sensor.check all the plugs on these for a good connection.

Jul 13, 2009 | 2003 Chevrolet Venture Passanger

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