Question about 2000 Saturn SL

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Engine idle to high under load. Then drops to normal

I have a 2000 SL, 1.9 SOHC. 185K. The service engine light code came on, was an EVAP code and EGR code. We replaced the gas cap, and the EGR valve, PCV valve. All sparks are clean.

This issue is that when I start the car, the idle jumps to 3K, holds for about 10-15 seconds, then drops to the normal 600-1K (depending on AC on). When I drop it to Reverse or Drive the idle jumps up to 1300-2000. When I apply the gas all seems fine, but when I let go the car does not slow down. When braking, the car will try to keep acclerating. From a dead stop I have made 30mph in less than 1 mile. Without touching the gas pedal! I am a little concerned I might not be able to stop at some point.

My mechanic says it might,might be the vac lines or an O2 sensor but both will be expensive. Any other ideas that might not cost a full day of labour at the shop?

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  • sillyXsaturn Dec 08, 2008

    i have pretty much the same problem. During start up, the idle jumps to almost 3 grand, but then drops to normal. sometime after driving it, i will notice when im at a red light, the idle is a little over a grand (normal is around 600-700RPM.) This makes it hard for stopping sometimes, as the car wants to go by itself, and sometimes it can reach up to about 20-25mph by itself. Then when i put the car in park or nuetral, the idle automatically jumps to 2000RPM+. I have checked all vacuum hoses and cvonnections. I cleaned out the intake and throttle valve, which at first seemed to help. so i figured maybe the pintle in IAC valve was sticking. I replaced the IAC. the problem went away for 2 days, but it still does the same thing, just not as often. In the past i have had the MIL on with an O2 sensor code, EVAP code, and and EGR code. I have not attempted to clear any codes. The MIL will turn off by itself, then it will come on again maybe after a month or so. This idle problem had occurred when i first got the car last november. During the summer, the problem seemed to have dissappeared. Now that its the winter again, the problem seemed to have come back. I know this is obviously putting alot of stress on the engine, and i dont want to cause any further damage. Im loooking for some suggestions or answers.

  • Anonymous Jan 06, 2009

    SAME PROBLEM BUT IT DIES... REPLACED BOTH O2 SENSORS.... MAYBE POSSIBLE EGR VALVE...

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  • Saturn Master
  • 11,467 Answers

Clean the throttle plate . videos on youtube . Throttle sticking , check cable also . You could check this with voltage check at the throttle postion sensor signal wire to PCM . With the key on you should read 0.5 at idle

Posted on Mar 13, 2017

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Posted on Jan 02, 2017

  • 101 Answers

SOURCE: 2002 Saturn idling high then drops to normal

Your 2002 Saturn car has an electrical recall .I think its the ignition modual.Owners should contact saturn @ 1-800-553-6000, Prompt 3
Please remember to rate my help in this matter ! Thankyou!

Posted on Dec 16, 2008

  • 1 Answer

SOURCE: Saturn 2001 SL code showing high idle misfire cyl,1 egr valve

i had that problem, you need to get your head gasket replace.

Posted on Mar 28, 2009

  • 1 Answer

SOURCE: EGR Valve, O2 Sensor

Absolutely a bad o2 sensor can cause problems with performance. If you replace one it is highly recommended to replace both or all four depending on your vehicle. If one o2 sensor is making your vehicle run rich you will burn more fuel and in return increase the amount of carbon or unburnt fuel if you will in your egr valve you could probably get away with cleaning it but I would recommend replacing it, it will save you from having to pull it off again. Check your catyletic converter because long exposure to carbon will mess it up.

Posted on Jun 06, 2009

  • 1915 Answers

SOURCE: I have a 1999 Saturn 4 cyl. The engine idles

leaking o-rings at the fuel injectors would explain the hard starting when warm-when you hold the petal to the floor, it shuts off the injectors, which will make it possible to start it after the injectors leak down on shutdown. O-rings are easy to replace, just disconnect the battery and pull the injectors straight up to remove, get the old rings out and install the new ones, light lubricate the base of the injectors and pop them back in.

that might explain the high idle too, although usually the idle is not consistent when the injectors are leaking at idle-idle is rough. I would make sure the engine coolant temperature sensor is new (they are very important on saturn, the original one is plastic and they are known to crack easily-the replacement should be brass)-also, check the Idle air controller, best to remove the throttle body (4 bolts) and remove the IAC and clean it thoroughly, being careful not to get the top half wet-sensitive electronics. Clean the post that the IAC goes into, and clean the throttle body (both sides) while you have it out.

Posted on Feb 22, 2011

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97 mercury villager p1400 code.stumble when I exellarate..? Stumped. ....


Possible Causes
  • EGR/EVAP solenoid connector is damaged (check pins for damage, moisture)
  • EGR/EVAP solenoid control circuit open or shorted to ground
  • EGR/EVAP solenoid has failed
  • PCM has failed
Setting Conditions:
Engine running at Cruise speed under light engine load; and the PCM detected an unexpected voltage on the EGR/EVAP solenoid control circuit.

Sett

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2005 Dodge Ram 1500 4.7 Engine. Starts fine, Idles fine, but when engine shifts into high gear and RPM lowers engine runs really rough under load


Have you checked for a broken valve spring. Repaired a dodge engine with the same running issue as you have described and it was a broken intake valve spring.

Feb 22, 2015 | 2005 Dodge Ram 1500

1 Answer

I meant how do you replace an egr sensor in a 2005 rendezvous?


A faulty egr would not create a high idle issue. if an egr valve were to open while idling then it would create a heavy stumbling engine or it would die right out. if there is a check engine light on (or service engine soon light) have the codes pulled. Failing that then I suggest taking it to a reputable shop

Feb 23, 2013 | 2005 Buick Rendezvous

1 Answer

How do i know if it is my ECTS or IAC for high reving in my 98 saturn sl sohc


The engine coolant temp.sensor and idle air control will usually make the check engine light come on if they go bad.If you have high idling then check for vacuum leaks or sticky throttle.

Nov 30, 2009 | 1998 Saturn SL

1 Answer

1994 gmc safair 4.3 wont run at idle and bad enough at high rpm you can't drive it. replaced plugs,wires,cap.roter,o2 sensor,used throttle body,used computer,new fuel pump,new fuel filter,can't figure it...


Is the "service engine" light on at all?
If so, what codes are present.
Have you checked the EGR valve. If the valve is stuck, the engine will idle very poorly. You can remove it and clean the carbon deposites and make sure it moves freely.
The EVAP purge solenoid will also cause an idle problem but should show up as a service engine light problem.
Let me know.
Regards,

Apr 20, 2009 | 1994 GMC Safari

1 Answer

Saturn 2001 SL code showing high idle misfire cyl,1 egr valve


i had that problem, you need to get your head gasket replace.

Mar 22, 2009 | 2001 Saturn SL

1 Answer

1995 mercury villager check engine code p1200 injector open


P0400 = EGR Flow
P0325 = knock sensor (Do not ever change a knock sensor, they don't affect anything and cost $600 to replace for absolutely no gain)
P1200 = I can't find this one. I think it's injector flow
report back on what you find.
Egr flow may be plugged egr passages or a bad solenoid.
--------------
1996 PCED OBDII-Villager SECTION 1B: Description and Operation
Exhaust Gas Recirculation System
Exhaust Gas Recirculation (EGR) System Operation The exhaust gas recirculation (EGR) system (Figure 1 below) recirculates a portion of the exhaust gases into the intake manifold under average vehicle driving conditions to reduce combustion temperatures and exhaust gas NOx content. The amount of exhaust gas recirculated varies according to operating conditions and will be cut completely under:
  • Engine starting condition
  • Low engine coolant temperature condition
  • Excessively high engine coolant temperature condition
  • Engine idling condition
  • High engine speed condition
  • Mass air flow sensor failure
The exhaust gas recirculation (EGR) system on the Villager uses the exhaust gas recirculation/evaporative emission (EGR/EVAP) control solenoid valve to provide vacuum to both the EGR valve and the EVAP canister when commanded by the PCM. If the exhaust backpressure is sufficient to close the EGR backpressure transducer valve, vacuum is sent to the EGR valve and allows EGR gas to flow into the intake manifold. If the exhaust backpressure is not sufficient, the EGR backpressure transducer will remain open and allow vacuum from the EGR/EVAP control solenoid to vent to the atmosphere.
The EGR system monitor, for OBD II regulations, uses an EGR temperature sensor to monitor the EGR system. The EGR temperature sensor is a thermister located in the EGR passageway. When hot exhaust gas is recirculated into the engine, the temperature at the EGR passageway increases. This increase is sensed by the EGR temperature sensor and a signal is sent to the PCM to indicate EGR flow. If the EGR temperature sensor does not detect EGR flow when commanded by the PCM after two consecutive drive cycles, the malfunction indicator lamp (MIL) will be illuminated and a diagnostic trouble code (DTC) will be stored. The MIL will be turned off after three consecutive drive cycles are completed with no malfunctions detected. The DTC will remain stored in the PCM memory until 80 drive cycles have been completed without the same malfunction detected in the system.
Figure 1: Exhaust Gas Recirculation (EGR) System Diagram Item Number Description 1 — EGR/EVAP Control Solenoid 2 — Air Cleaner Housing 3 — Throttle Valve 4 — EGR Temperature Sensor 5 — EGR Valve 6 — EGR Backpressure Transducer 7 — EVAP Canister
Exhaust Gas Recirculation (EGR) Backpressure Transducer Valve The exhaust gas recirculation (EGR) backpressure transducer valve is used to control EGR. The EGR valve is operated by ported vacuum, but the ported vacuum will normally be vented off at the EGR backpressure transducer valve. As rpm increases, exhaust pressure increases and pushes on the diaphragm in the EGR backpressure transducer valve and closes the vacuum vent.
Figure 2: EGR Backpressure Transducer Value
Item Number Description 1 — Throttle Valve 2 — Vacuum Port 3 9D475 EGR Valve 4 9F452 EGR Backpressure Transducer Valve 5 — EVAP Canister 6 — EGR/EVAP Control Solenoid 7 — Vent
EGR/EVAP Control Solenoid The exhaust gas recirculation/evaporative emission (EGR/EVAP) control solenoid (Figure 3) is controlled by the powertrain control module (PCM). The EGR/EVAP control solenoid controls vacuum to both the exhaust gas recirculation (EGR) valve and to the evaporative (EVAP) emission canister. When the EGR/EVAP control solenoid is off (12 V signal from the PCM) vacuum is supplied to both the EGR valve and to the EVAP canister. When the EGR/EVAP control solenoid is on (ground supplied by PCM) vacuum is vented to the atmosphere keeping the EGR valve closed and no vacuum to the EVAP canister. The PCM will command the EGR/EVAP control solenoid on at:
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  • Low engine coolant temperature condition
  • Excessively high engine coolant temperature condition
  • Engine idling condition
  • High engine speed condition
  • Mass air flow sensor failure
Figure 3: Exhaust Gas Recirculation/Evaporative Emission (EGR/EVAP) Control Solenoid
Exhaust Gas Recirculation (EGR) Temperature Sensor
The exhaust gas recirculation (EGR) temperature sensor (Figure 4) is a thermister type sensor that monitors the temperature of the exhaust in the EGR passageway. As the EGR flow increases, the temperature increases. This process creates a change in the resistance of the sensor, which decreases as the temperature increases. The signal is sent to the powertrain control module (PCM) to indicate that the EGR system is working properly. If the EGR temperature sensor does not change resistance as the PCM expects on two consecutive drives, the malfunction indicator lamp (MIL) will be illuminated and a diagnostic trouble code (DTC) will be stored.
Figure 4: EGR Temperature Sensor Exhaust Gas Recirculation (EGR) Valve
The exhaust gas recirculation (EGR) valve (Figure 5) recirculates portions of the exhaust gas back into the intake manifold to reduce the amount of the NOx released during combustion and to reduce combustion temperature. The amount of exhaust gases that are released into the engine is proportional to the load on the engine.
Figure 5: EGR Valve

Mar 20, 2009 | 1995 Mercury Villager

1 Answer

4.3 Liter V-6 Idles rough when in gear, runs fine on highway.


Can you check fuel trims at idle and under load?
If fuel trim is high at low speed and load, look for a vacuum leak.
If fuel trim is high at high speed and loads, look for fuel volumn problem or restriction.
If fuel trim is high at all speeds and loads look for pcm input fault, maybe a maf sensor problem?
If fuel trim is negative low speed and load, look for fuel pressure regulator or injector leak. If fuel trim is negative at all speeds and loads check ect and iac.

If you have the spider fuel system, that system is noted for problems. key on engine off, 60--66 psi fuel pressure.

Mar 06, 2017 | 1999 Chevrolet Silverado 1500

2 Answers

Check engine light is on and high idle (1500rpm)


Some times the E.G.R. will stick half open. This will make the engine surge or have high idle. Try replaceing the E.G.R. located under the upper intake. Do not go with after market E.G.R. The spring in them are to powrefil and the E.G.R. wil not open. Also try replaceing the O2 sensors. This could give the engine more fuel thus a higher idle. Some vehicles the T.P.S. can be ajusted, do some checking to see if yours is adjustable.

Please contact me if your problem presists.
Thanks, Charlie

Feb 03, 2009 | 2000 GMC Jimmy

1 Answer

Idles high


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.

Jan 20, 2009 | 1995 Saturn Sl

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