Question about GMC Sierra 1500

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Over revving When starting the car the auto choke always activates even when the engine is at normal operating temp. it does settle down after about 20 or so seconds, and returns to normal idle. when driving all is ok but upon braking and coming to a stop the engine revs are at 1200rpm and again it takes about 20 seconds before returnig to idle, at times when you are driving and take your foot of the accelerator the car takes a few seconds to realise that the accelerator has been released. Can someone please help me with this problem.

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I don't know the year but it could be a defective IAC solenoid. If its an older truck then it could be a throttle cable.

Posted on Jun 18, 2009

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I have a 2004 daihatsu delta, it has the turbo diesel toyota engine.


diesel engine do not have chokes
next I suspect that you have an exhaust brake in operation (solenoid controlled flapper valve in the exhaust) that is activated by the brake pedal and
check for a switch or wire problem that is randomly activating the brake
the light will be like a butterfly in a tube with bars on either side of it

Aug 03, 2016 | Daihatsu Cars & Trucks

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As soon as I start my 94 honda accord lx it's always revved up like I'm holding the gas pedal down a little what can this be


Its your choke revving up the engine untal it warms up. Once its warmed up it should not do it. If it does then the choke is stuck. Spray with some WD40.
It maybe more but simple stuff 1st. Mike

Mar 02, 2016 | Honda Cars & Trucks

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Auto choke on a 911 porsche 1980SC not working


check the cam action on the linkage from the auto choke to the throttle screw.

Apr 02, 2014 | Cars & Trucks

1 Answer

1984 olds cutlass supreme brougham. Drives good until operating temp is reached. It starts to cut out. Changed plugs,wires,cap,rotor. Checked timing. Still cuts out. No smoke from exhaust. Changed fuel...


I would be suspecting a faulty condenser and coil as when they reach operating temperature they start to break down electrically.. Check that the auto choke is coming off and not tending to over fuel the engine

Feb 16, 2014 | Cars & Trucks

1 Answer

I turn on ignition and vehicle starts to idle real high seems like accelarator cable is sticking


Hi Clucas, If you're talking about a cold engine, the vehicle is fitted with an automatic 'up idle' system. Depending on how cold the ambient temperature is. The colder it is outside the higher the idle, until the engine reaches normal operating temp. The engine should then settle down to the correct idle speed. If however the cold start raises the speed to more than 1350, have a scan carried out. If the idle speed is always at a high rpm, do the same.A leakage of air into the intake manifold can also cause the latter problem. A leakage however will not be evident via a scan. Regards Johngee10

Sep 08, 2011 | Lexus ES 300 Cars & Trucks

1 Answer

My Ford Mustang 2002 Idles high at start up. Why does it do that? It even idles high in gear when i am not pressing the gas and the idling is causing it to speed up more on its own when Im not pressing...


Hello and welcome to FixYa!

All EFI (electronic fuel injection) engines idles high during start ups. It serves like an auto choke to regulate the vacuum supply and most of all to lessen the wear and tear of the engine. Please drive the car only when it reaches the normal operating temp.

Hope this helps and thank you for using FixYa! Have a good one!

Apr 06, 2011 | 2002 Ford Mustang

1 Answer

Engine stalls at operating temp. and will not restart until cooled down, when started will sometimes backfire ?


sounds like your auto choke is stuck on had the same problem with a honda i worked on would be fine untill got to running temp then would run like **** and stall out and wouldnt start again till cold

Mar 04, 2011 | 1990 Oldsmobile Eighty Eight

1 Answer

When turn on the car in the morning, i accelerate and the revolutions up to 6,000rpm normal. In 3 minute when the car up the motor temperature to the normal operation, i accelerate and the revolutions up...


To begin with, if you are revving a cold engine to 6000 RPM, you are asking for a blown engine. Most OBD vehicles are equipped with a rev limiter that will cut off fuel at 3000 to 4000 rpm to prevent you from over-revving your engine and blowing it up. If yours is revving to 6000 RPM cold, then the rev limiter, for some reason is not working while it is cold. I have no explaination for this. The best thing I can tell you is to stop revving your engine so high when it is cold unless you really want to see what an engine looks like after is has gone off like a grenade.

Nov 27, 2010 | 1996 Honda Accord

1 Answer

Return to idle


Sounds like your throttle is sticking, try looking under the hood for a cable that come out of the firewall. WD40

Jun 18, 2009 | 1994 Nissan Sentra 4-Door

1 Answer

High idling at low temp.


Hi,

Offhand, yes this would be normal. The high idle is brought about by the auto choke whose purpose is to hasten the reaching of operating temperature of the engine. The fact that the idle RPM goes down after some time is a good indicator, it tells us that the auto choke is working.

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Nov 22, 2008 | 1996 Toyota Corolla

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