Question about 2000 Saturn SL

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Engine idles at 2400 rpm:

My 1.9 liter SOC engine idle too high, at 2400 rpm. I replace the idler control value, as well as clean the throttle assemby and throttle body (both were caked with carbon). Still have the problem...could it be a vaccum line?

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  • Anonymous Jan 19, 2009

    My 2000 Saturn SL1 runs with a high idle after the car runs for a while. Sometimes it will idle down but most of the time if is around 2000 rpms

  • Rick Byrd
    Rick Byrd May 11, 2010

    vacuum leak , yes , quite possible , is the check engine light on ? did the instructions for the idle control valve mention to reset the adaptive values after installing it , (disconnect battery cable if you don't have a scanner) . a vacuum leak might be easily found with a can of brake cleaner , while spraying around the intake and throttle body , vacuum lines, you might hear it and sense the idle change when you hit the right spot .



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You sucking air somewhere!

Posted on Jan 28, 2009

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What is relearn predcudre for idle on 08 chev. 1500 5.3 eng.

Throttle Learn
The engine control module (ECM) learns the airflow through the throttle body to ensure the correct idle. The learned airflow values are stored within the ECM. These values are learned to adjust for production variation and will continuously learn during the life of the vehicle to compensate for reduced airflow due to coking. Anytime the throttle body airflow rate changes, for example due to cleaning or replacing, the values must be relearned.
A vehicle that had a heavily coked throttle body that has been cleaned or replaced may take several drive cycles to learn out the coking. To accelerate the process, the scan tool has the ability to reset all learned values back to zero. A new ECM will also have values set to zero.
The idle may be unstable or a DTC may set if the learned values do not match the actual airflow. Without Scan Tool - Learn Procedure
• DTCs P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0120, P0122, P0123, P0128, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0222, P0223, P0300, P0351, P0352, P0353, P0496, P0601, P0604, P0606, P060D, P0641, P0651, P1516, P2101, P2119, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, or P2176 are not set.
• The engine speed is between 450-4,000 RPM.
• The manifold absolute pressure (MAP) is greater than 5 kPa.
• The mass air flow (MAF) is greater than 2 g/s.
• The ignition 1 voltage is greater than 10 volts. Without Scan Tool - Learn Procedure
Important: Do NOT perform this procedure if DTCs are set. Refer to Diagnostic Trouble Code (DTC) List - Vehicle.
Start and idle the engine in PARK for 3 minutes.

The ECM will start to learn the new idle cells and Desired RPM should start to decrease.
Ignition OFF for 60 seconds.
Start and idle the engine in PARK for 3 minutes.
After the 3 minute run time the engine should be idling normal.
Important: During the drive cycle the check engine light may come on with idle speed DTCs. If idle speed codes are set, clear codes so the ECM can continue to learn.
? If the engine idle speed has not been learned the vehicle will need to be driven at speeds above 70 km/h (44 mph) with several decelerations and extended idles.
After the drive cycle, the engine should be idling normally.
? If the engine idle speed has not been learned, turn OFF the ignition for 60 seconds and repeat step 6.
Once the engine speed has returned to normal, clear DTCs and return to the diagnostic that referred you here.

Dec 18, 2016 | Cars & Trucks

1 Answer

Correct code P0504?

What Colorado do you have ? 2 wheel or 4 wheel drive ? Sport ,sport LS 3.5L , Z71, Z71 LS. etc. what size engine ? an does it have electronic throttle control ? I have factory service info an it is not showing that code .
DTC P0506

Circuit Description

The throttle actuator control (TAC) motor is controlled by the powertrain control module (PCM). The DC motor located in the throttle body drives the throttle plate. In order to decrease idle speed, the PCM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the PCM commands the throttle plate open allowing more air to pass the throttle plate. If the actual idle RPM does not match the desired idle RPM within a calibrated time, this DTC sets.

DTC Descriptor

This diagnostic procedure supports the following DTC:
DTC P0506 Idle Speed Low
DTC P0507

Circuit Description

The throttle actuator control (TAC) motor is controlled by the powertrain control module (PCM). The DC motor located in the throttle body drives the throttle plate. In order to decrease idle speed, the PCM commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the PCM commands the throttle plate open allowing more air to pass the throttle plate. If the actual idle RPM does not match the desired idle RPM within a calibrated time, this DTC sets.

DTC Descriptor

This diagnostic procedure supports the following DTC:
DTC P0507 Idle Speed High
Cleaning the throttle body mite take care of it !
Cleaning Cleaning An Electronic Throttle Body Safely

Jan 31, 2015 | 2005 Chevrolet Colorado

1 Answer

My 1998 Jeep wrangler is idling high I replace IAC Valve and still high, cleaned the throttle good still high, and the engine light is on.

hot engine or cold or both,? and how high is high?
which engine.???? USA car, not the Export? 2.5 or 4.0L
why ignore that CEL lamp. the PCM is trying so hard to communicate to you, so plug any scan tool on earth in that port, 16pin USA OBD2 port. (USA car?)
scan it , and get the codes. DTCs.
The car has MAP based system , called speed density.
all pro machinics knows that phrase.
the reason is Map BASED EFI , all race fast with air leaks.
what happens is the air leak is detected (the brain is clueless as to where) and the brain matches perfect fueling to said total air.
bam you are an expert. easy huh?

air leaks 101 (its is complex in diagnosis but IS simple physics.)
  1. why not state what too high is 801 rpm 1000, 2000 RPM.
  2. The plenum vacuum at near 20 inches.?
  3. All vacuum hoses leak free, or worse missing or fell off
  4. did you pinch all vacuum lines to find the leaker (rpm drops)
  5. is the throttle cable set tight? it must not ever be so.
  6. is the Throttle valve full of gunk blocking is close up.?
  7. the key to finding this is blocking all air paths 1 by 1.
  8. The engine coolant never reaches and holds 180F + temp.
  9. The fast idle input to the PCM is true.
  10. Some one hacked the throttle stop(factory set?)
  11. see magic below:

the IAC motor never fails but does love to stick
cleaned my 3 jeeps like a 100 times. in 500k miles total.
its just a simple stepper motor.
keep in mind fast idle speed is a feature of the ECU.

to prove i have leaks , on my 4.0L
i removed the IAS stepper, motor. and unscrewed (causing closed
then put it back with no connnector. and started the engine.
it hot idle screams YOU HAVE AIR LEAKS.
acid test, no engine can run with zero air supply, that is my magic.
controlling ALL that air. what ever that takes.

more data here.fsm words.
The PCM is also equipped with a memory program that records the number of steps the IAC stepper motor most recently advanced to during a certain set of parameters. For example: The PCM was attempting to maintain a 1000 rpm target during a cold start-up cycle. The last recorded number of steps for that may have been 125. That value would be recorded in the memory cell so that the next time the PCM recognizes the identical conditions; the PCM recalls that 125 steps were required to maintain the target. This program allows for greater customer satisfaction due to greater control of engine idle.
Another function of the memory program, which occurs when the power steering switch (if equipped), or the A/C request circuit, requires that the IAC stepper motor control engine rpm, is the recording of the last targeted steps into the memory cell. The PCM can anticipate A/C compressor loads. This is accomplished by delaying compressor operation for approximately 0.5 seconds until the PCM moves the IAC stepper motor to the recorded steps that were loaded into the memory cell. Using this program helps eliminate idle-quality changes as loads change. Finally, the PCM incorporates a No-Load engine speed limiter of approximately 1800 - 2000 rpm, when it recognizes that the TPS is indicating an idle signal and IAC motor cannot maintain engine idle. A (factory adjusted) set screw is used to mechanically limit the position of the throttle body throttle plate. The IAC motor through the PCM controls all idle speed functions.

Oct 20, 2014 | 1998 Jeep Wrangler

1 Answer

Vibrations during idling

which engine.??? never post lacking engine ,here is why.
1.3 L G13B I4
1.5 L G15A I4
1.6 L G16B I4
1.8 L J18A I4
1.8 L BP-ZE I4
1.9 L XUD9 diesel I4

Ill answer in the generic and for GAS engines. only.
that is illegal RPM, the ECU regulates it to 800 all the time
that means the ECU can not regulate the RPM now, for many reasons.
and sure it vibrates too low, that is normal for all 4cylinders to do that.
no bad engine mounts never lower RPM to 600, ever.
they dont control idle speed at all.
the #1 reason for most cars to idle too low are:
1: EGR leaks, (clean it)
2: ISC stuck closed (electric idle speed acututor dirty) clean it.
3: gross misfiring , caused by bad spark or bad fuel mix.
4: low compression on 1 or more cylinders (real low) Do compression test at WOT. throttle.

Apr 19, 2014 | 1997 Suzuki Baleno

1 Answer

The engine is idling high around 2500 rpm, I have already replaced the idler air control valve. No vacuum leaks are present.

There will be a vacuum leak around the base of the throttle body gasket. You can confirm this by spraying carb cleaner around it's base. You should remove the throttle body, clean it thoroughly and replace the gasket. If you would like to really check, you can get a scan tool and monitor IAC counts. If the engine is still idling high and the counts read "0" on a warm engine, this means that the computer is trying as hard as it can to block all idle air, so it must be coming in somewhere. Possibly the throttle valve? has anyone been playing with the factory setting on the minimum idle screw?

Jan 16, 2011 | 1995 GMC Jimmy

3 Answers

My 2005 altima idles high and engine code

This P0507 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle. In this case, the P0507 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is greater than the desired (pre-programmed) RPM. In the case of GM vehicles (and possibly others) if the idle speed is over 200 rpm higher than expected, this code will be set.

Jun 07, 2010 | 2005 Nissan Altima

1 Answer

My 96 toyota celica 2.2 Liter will (5SFE0) will not idle down to where its supposed to be whenever i come to a stop. It stays at about 1700 rpm. I have to step on the gas to make come down to 750 rpm where...

Probably the "idle speed controller",(the ecu is programmed with target idling speeds values to respond to different engine conditions, coolant temp, a/c on/off etc,sensors transmit signals to the ecu which controls the flow of air through the bypass of the throttle valve and adjust idle speed top target value)
however this what the manual says,
check for defective throttle linkage or cable
check idle up-up vacum switching valve
check coolant temp sensor
check throttle position sensor.
Usually if its major, then the check engine light comes on,

Jul 09, 2009 | 1996 Toyota Celica

2 Answers

The throttle sticks during the warmer months

The throttle body is located on the driver side of the engine compartment.
If throttle plate has not been clean you might want to get a can of carburetor cleaner, remove the inlet snorkel hose and clean around and behind the throttle plate.
The IAC (idle air control) motor may need to be cleaned. The IAC controls your idle rpm.
Good luck, let me know.

Apr 27, 2009 | 2001 Chevrolet Malibu

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