Question about 1996 Pontiac Grand Am

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Power surging The car starts in morning (cold start). RPM's are normal but to be runnig 5 to 6 hours the car starts surging then the RPM's are 3-4 times higher.

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Try cleaning the idle speed control airbypass valve, they get sludged up and cause this kind of idle problem.

Posted on Nov 11, 2008

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Why does idle speed surge?


Thread: 6.0 V12 XJS High RPM When Warm - Jaguar Forum.co.uk

www.jaguarforum.com/showthread.php?t=54266
Mar 3, 2013 - I recently bought a 1993 6.0 V12 XJS and when it is started from cold it runs ... to 1300 RPM so it wants to surge forward when braking which is strange. ...Classics · XJS 3.6,4.0,5.3 & 6.0; 6.0 V12 XJS High RPM When Warm ... You might want to adjust the aux (extra) air valve to bring the idle speed down.

Sep 25, 2015 | 1989 Jaguar XJS 5.3

1 Answer

2008 ford ranger 2.5, what could be the problem if engine starts normal but after second the engine fluctuate?


Bleeding the fuel system is typically only needed on high pressure systems like GDI and Diesel vehicles, and only to get them to start if they run dry once.
If your engine keeps running but the idle speed moves up and down there are many things that can cause that. More information is always helpful. Does it always do it whenever the car is running? Or does it only do it conditionally (IE Only when 1st started in the morning, only after warmed up or getting off the dreeway, only with AC on or at night...describe as much as you can.)
Most newer cars have computer controlled idle strategy that wants to idle the car cold around 1000-1500 rpm (After an initial higher rev called a FLARE) and then bring it down in 3 or 4 minutes to 700ish rpm. If it CANNOT bring it down by normal means, then many resort to something called FUEL CUT IDLE where it actually turns off the fuel momentarily and the RPM will drop because the car is stalling and running out of gas...then back on and it starts to rev back up and when it gets too hiugh it turns back off. Cars that do this can have annoying surges from 500-2000 back and forth at idle forever.

a vacuum leak or MAF meter problem can cause rough idle. ALmost any engine code that turns on CHECK ENGINE lamp may be suspect, does it have any current fault codes?

As well, consider Sticking manifold runners, EGR systems, and temperature sensors all can cause surging, so can a defective Oxygen sensor, slightly jumped timing, and dirty throttle plates the ECM wants to close more but they wont due to dirt. If its not something fairly obvious, it may require deeper checking.

Jan 29, 2015 | 2008 Ford Ranger 2.5

2 Answers

03 corolla petrol revs up on its own when idling and then settles down again


R u start the car in cold morning or any cold condition? If so, it is normal revs up itself. Sometimes I see some cars revs up to 2000 rpm for 2 to 5 mins, then drop down to 1000 rpm.

Jan 03, 2014 | Toyota Corolla Cars & Trucks

1 Answer

Increase then decrease idle when engine is cold especially


cold engine idle surge. (problem)
RPM range of surge not stated
300-700 or 800 to 1500? (range is critical to diagnosis)

bad fuel
running summer fuel in winter (running old fuel?)
needs a tune up bad, see the list in the operator guide.
idle speed controller,sticking or EGR valve same. (clean them)
location not stated, so cant guess about local air temps.?
no other symptoms, lack of engine power? etc?
was it ok last week, or better, when was the last time it was OK?
1week, 1year?
surge , causes, on a tuned engine might be:
1: too lean. so lean the ISC can not control idle. rpm low, stalling
2: too rich, flooding, stalling, spark plugs foul (look at them)
3: weak compression in 1 or more cylinders.
4: bad spark.
5: air leaks, in the plenum causing , ISC to lose control.
why high RPM?

especially?
well that means it fails hot too.
and there is a simple tests. for hot surge.
is engine fully hot? 180F and holds solid there?
say rpm is about 800
and you turn on head lights, heater fan and (not AC) and defrost.
the RPM must hold or the ISC is failing.
ISC -= idle speed controls. (all EFI has this function)

Oct 28, 2013 | 1996 Honda Prelude

1 Answer

Hi..my kia avella rpm reaches for about 1200 rpm when I start up in the morning and gradually decreases to about 600 rpm.but it takes 10 mins bfore the rpm goes down.is this normal?m And my engine loses...


Yes, that is normal operation for an engine. It needs to run at higher idle when cold and the computer does that through the temp sender. Make sure it's not excessive due to any vacuum leaks. This and the AC power loss would be exaggerated if the engine is not running correctly.

Aug 18, 2013 | Cars & Trucks

1 Answer

I have a 2000 BMW 528, 140,000 miles. On cold mornings my car turns off when I try to warm it up. It starts without any problem. After approximately 30 seconds to 1 minute, the RPM gauge starts to go...


Could be the VANOS Seals. You can buy them for 60.00 and it takes about 5 hours to do (but will save you a lot of money). Follow the steps at this site and you're good to go: http://www.beisansystems.com/


Good luck!

Dec 31, 2010 | BMW 528 Cars & Trucks

1 Answer

When I start my 1999 honda CRV it surges to about


no the surge that high is not normal a normal cold start should go to around 1500 then settle slowly to 750 or so but this all depends on engine temp and ambient air temperature

Feb 07, 2010 | Honda CR-V Cars & Trucks

1 Answer

Engine surges up and down when first starting, and heater blows hot and cold


it may be your mas air flow censer making the engine to surge in rpm.
The heater problem may be from the thermostat not operating normally. When is the last time you did maintenance on the cooling system?

Dec 28, 2009 | 1992 Acura Legend

1 Answer

2000 durango 5.2 cold starts, engine stalls or rpm surging


i know this may sound stupid but if your battery is old or a little weak on this vehicle the idle air control solenoid will act speradicley hunting for were it should be and the vehicle will stall.replace battery

Jan 31, 2009 | 2000 Dodge Durango

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