Question about 1991 Toyota Pickup

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In cold weather only, engine revs up and down until warmed up?

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1989 dodge ram revs up and done in cold weather

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Ajust your idler arm

Posted on Dec 13, 2009

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Bottom falls out of idle after revving engine cold


Its probably a problem with the water temperature sensor. Also do not rev a cold engine. The engine has a "cold start sequence" which is similar to a choke. When the engine gives a cold signal, the fuel mix is made richer and the timing is changed until the engine warms.

Let the engine warm at the preset factory settings. Sometimes the O2 sensors will cancel the cold start sequence before the water is warm. Racing the engine will warm the O2 sensors too quickly.

May 14, 2014 | 1993 Mercury Grand Marquis

2 Answers

High rev at cold (winter cold!) idle


Your toyota technician should know what a "cold starting solenoid" is. It is the little thing that works your throttle until the motor warms up and something else takes over. I'd suggest going to another technician.

Nov 28, 2013 | 2003 Toyota Corolla

1 Answer

Runs ruff while cold at start up


There is a door in your air intake that is thermoststicly controlled
that is to remain partially closed until tge engine warms up.Thereby letting in cold air on a cold engine, causing it to run rough.

Nov 08, 2013 | 1994 Dodge Spirit

1 Answer

1987 mercedes 420sel car idles higher and higher after it warms up and will not kick down until it's cold again.


You have a vacuum leak on the intake.Start the engine and spray carb cleaner around all of the vacuum hoses and see where the engine REVS UP while you are spraying there... that is your leak area... correct it.

Apr 12, 2013 | Cars & Trucks

1 Answer

Gmc idles rough in cold weather


Check the coolant temp. sensor (It controls warm up RPM, open loop ECU mode) And change the fuel filter every 20,000 miles to prevent water in filter from freezing ( fuel starvation).

May 29, 2017 | 2005 GMC Yukon

1 Answer

F250 Diesel engine won't start in cold weather


check your glow plug relay! located on the right side head

Dec 27, 2009 | 2003 Ford F250 Super Duty Crew Cab

1 Answer

95 jeep grand cherokee, hard starting, backfires, when cold


get a couple bottles of gas line antifreeze .. if you don't already use it and add it to the gas.

Robert

P.S. in minus 40 i don't even get out of bed... minus 23 here last nite... isn't winter grand

Jan 21, 2009 | 1995 Jeep Grand Cherokee

1 Answer

When I start the engine from cold it runs on high revs too long


Hi ..... This sounds as if it's fitted with an automatic choke, as long as the revs drop when it's warm there is nothing to worry about. The indication when these start to go wrong is that the car won't start when cold ................ even then any decent mechanic can fit a normal/manual choke.

Jan 03, 2009 | 2004 Hyundai Santa Fe

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