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High rpm but car does speed does not match - 1998 Pontiac Grand Prix

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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

Still searching the right answer on Jag S TYPE- HIGH RPM PROBLEM - RPM won't pull back when foot taken off accelerator when coasting. RPM will match the running speed of vehicle. and stay the


Hi Richard, I'm not an expert on Jags, just a little jealous I don't have one. Looks like a very nice vehicle. Have a close look, inspecting all hoses and vacuum pipes on the intake manifold side of the engine for any damage or loose fitting. The problem seems to be a leakage of air which is raising the idle speed. Regards John

Sep 09, 2012 | Jaguar S-Type Cars & Trucks

1 Answer

Acceralating sienna problems


from what i read, the RPM goes high and the speed is slow it sounds like your transmission is slipping.

Sep 04, 2012 | 2005 Toyota Sienna LE

1 Answer

I have a 2000 Toyota Carolla AE110 and its idle speed is too high. When its warm enough for trhe fan to even come on the idle speed is still over 1200 rpm, I took off the throttle body and cleaned it but...


Typical poor IAC control is cold stalling or slow idle speed response to changes in electrical load, The IAC is check by monitoring Idle RPM,when you turn on the head lamp and press brake pedal,The IAC responds for electrical load, You say you cange the ECM,it has to match if you are protocal CAN,without a reflash the behavior of the transmission is compromised, Whenever a transmission component or transmission change is performed the ECM must have its learned value performed,Yes the ECM could of been the solution,as for removing the ABS relay your vehicle has a zero point calibration.Flash the ECM

Mar 10, 2012 | Toyota Corolla Cars & Trucks

1 Answer

92 NISSAN WITH BOGGING AT 2800 3500 RPM AND AT LEVEL SPEED 4CYL AND 5 SPEED


For this types of problem,there are few help inks to troubleshoot the problem.Click the link below to go through the troubleshooting procedure to resolve the issues :----Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html-----------van idles rough? http://howtobyme.blogspot.in/2012/01/2004-ford-freestar-van-idles-rough.html
--------------runs lean and idles rough? http://technoanswers.blogspot.in/2012/02/ford-runs-lean-and-idles-rough.html
-----------Car still runs Rough after tune up? http://howtobyme.blogspot.com/2011/12/car-still-runs-rough-after-tune-up.html
------------Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed? http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html
----------High rpm in neutral? Inconsistant high RPM in neutral? http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
------------Engine Backfires? http://technoanswers.blogspot.in/2012/02/jeep-backfires.html----------- Nissan stalls and bucks on Acceleration?

http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html

-----------
Nissan Pathfinder Backfires? http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-backfires.html
---------How to adjust rpm? http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
------------Engine cuts out at 3000 RPM? http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html
----------This will help.Thanks.

Feb 17, 2012 | 1992 Nissan Pickup

3 Answers

The engine 4M41 is overheating heating on hills


if you drive on hills at high rpm ur engine temp. will surely shoot up due to the load on ur engine while trying to gain the desired speed/ u should not drive uphill with high rpm try to maintain low speed with low rpm

Apr 08, 2010 | 2000 Mitsubishi Montero Sport

2 Answers

I have a 1999 Pontiac Sunfire. It seems to be high on the RPM's when i go faster in the car. Is there anything i can check to see what the problem is.


rpms do increase when you push the pedal to go faster....but then if it is an automatic tranny, it may be slipping thus rpms are fast but speed doesn't match rpms. luck to you

Mar 26, 2010 | 1999 Pontiac Sunfire

1 Answer

Too high engine rpm at freeway speeds


that is a normal rpm for the nissan pickup (hardbody)

Nov 27, 2008 | 1997 Nissan Pickup

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