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Cranking a cold motor why does it take a long time to idol back down ?


Once started an engine needs to idle fast for a while and then progressively slows as it warms and becomes capable of smooth and reliable idling. This is built into the software of electronic injection models and the linkages of both manual and automatic choke or strangler devices.

It is more pronounced with some models than others but generally normal idle should be attained within 2 minutes even in very cold weather, sometimes less than half that. If that doesn't happen there is probably a fault that should be investigated.

Some models have a damper fitted to the throttle to prevent it returning suddenly and sometimes these can be troublesome, effectively holding the throttle open a little after the engine has been revved and allowing it to slow down only gradually. They are usually much worse when cold.

Apr 01, 2017 | Cars & Trucks

1 Answer

Normal idling speed


A manual transmission is about 400 RPM and and automatic is about 700. When you put the automatic in gear it will drop by about 200. When the engine is cold you can be about 1100.

Mar 28, 2014 | 2005 Toyota Corolla

1 Answer

Engine starts then die when idling, changed fuel pump and also magnets (COILS)


I had the exact same problem with my 2003 Galant. The above solutions may be correct but try some other things first.
1) start car and with engine idling turn on the AC. If the rpm's drop and don't come back up or the car dies, it is probably a dirty max air flow sensor. This is an easy fix even for a novice. Many you tube videos to show you how to clean.
2)check spark plug wires and boots. Cheap solution and a likely culprit.
3)Is your service engine soon light on? Could be an emissions problem. If you are able to drive the vehicle and notice that even at highway speeds you slow down with pressure on the accelerator you may have to replace something in secondary emissions control. Not likely.

If it is a vac. hose leak you should be able to hear it and locate it with your hood up and engine running.

Mar 11, 2014 | 2003 Mitsubishi Galant

1 Answer

I have a 1998 Chevy lumina 3.1 that when you started it starts at idling in the red zone if you try and t hich the gas it automatically kills the engine so it doesn't blow up


You have a Vacuum Leak that is sucking in AIR and that is causing the Increased RPM.

Does it slow down after it warms up?

I once had a Idle Air Control that was causing it on a 3.1 and when I replaced it, the Idle went back to normal....

Apr 08, 2013 | Cars & Trucks

1 Answer

Have acceleration problem when passing


really need a bit more information.does the engine sound slow or is it revving quite high as you are trying to overtake another car?slow may be a blocked fuel filter and or air filter.revving but slow moving may be a slipping clutch if it is a manual gearbox,or a worn transmission if it is an automatic(although check the fluid level while idling in park,and handbrake on firmly.)
Hope this helps,if not if you can supply some more info,then I can be more precise in diagnosis and repair

Mar 27, 2011 | Toyota Corolla Cars & Trucks

1 Answer

My vw passat (an automatic) stalls when I have to come to a stop a lights, or even sometimes when I have to slow right down to an 'almost' stop - any ideas what the problem might be ????


Probably the IAC which control the idle but usually you will see some erratic idling as well. Pretty sure something to do with the control of idle and fuel. Maybe you need to clean throttle body and raise idle some might help. Have IAC checked. 

Jul 09, 2010 | 1990 Volkswagen Passat

2 Answers

Blowing cold air when idling


temp should rise while idling unless thermostat is stuck open and not letting heat build up

Nov 11, 2009 | 2006 Chevrolet Impala

1 Answer

2001 isuzu first startup rattling metallic sound under cars front


You didn't say which model or engine.
Check for loose heat shields, broken engine or transmission mounts.

Aug 18, 2009 | 2006 Pontiac G6

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