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Overheating, when at idle or slow speed - 1992 Chevrolet Lumina

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Check fan operation, my guess is it's not working and the faster you drive the more air cools the rad. When going slow not to much air to cool it off. If engine is hot fan should be on.

Posted on Aug 21, 2010

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How to increase idle speed on 97 mercury grand marquis, idles to slow,then stops running.


Idle speed is controlled by the computer. If it is idling slow then there is a different issue. A malfunctioning sensor is the most likely culprit.

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Stalls when slowing down


check idle speed sensor as the motor is still under load while slowing down. Try placing tranny in neutral before slowing down and see if that improves the situation. Check the idle speed while stationary and in gear. It should drop 100-200 rpm under neutral idle but any more and I would be looking at idle speed sensor .

Jan 23, 2013 | 2000 Ford Taurus

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2000 mercury villager, runs a fast idle. whether cold or warm the idle remains at a high idle speed, it even pulls with the brake applied.


Could be a vac leak, or a dirty throttle body, or a faulty idle air control valve. The computer controls idle speed by regulating the amount of air into the intake. Could also be something pulling on the throttle cable such as the cruise control.

Sep 28, 2012 | 2000 Mercury Villager

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Hello my honda accord lx 90' stops whenever i make a stop or slow down can you help me?


IDLE SPEED COULD BE LOW CHECK IDLE SPEED SHOULD BE 650 - 750 RPM.CHECK IDLE SPEED IF OKAY YOU COULD HAVE FAULTY FUEL PUMP OR VECHICLE COULD BE GETTING HOT OVERHEATING SHUTTING OFF ENGINE.YOUR EGR VALVE OR PCV VALVE STUCK OPEN.CODE SCAN FOR FAULT CODES.

Aug 11, 2011 | 1990 Honda Accord

1 Answer

MY VAN IS OVERHEATING WHAT ARE THE STEPS FOR TROUBLESHOOTING


When does it overheat? At idle, or at highway speed? Is the coolant level where it should be? Overheating at idle or highway speed may be a faulty thermostat. If it overheats only at idle then it is likely a cooling fan fault. To determine if the fan is working start the engine and switch the A/C on, the fan should come on, if it does not, then you need to have the computer "scanned" to see if it can detect the reason for the fan not coming on. If the fan is switching on, then you need to have the water pump checked to see if in fact it is pumping coolant (this could also be the cause of overheating at highway speed) If you are overheating only at highway speed you may want to have the enigine checked for a blown head-gasket, or faulty radiator.

Apr 18, 2011 | 1997 Oldsmobile Silhouette

1 Answer

When car picks up speed the heat blows. when u stop or slow down. cold air blows


Tell me when you speed up is the heater set on hot and high speed?????
WHEN you slow down is the fan still going at the same speed or dose it go very slow when on idle.
If the Fan stays on high but runs cold when going about 80 in top but when you speed up it gets hot and then back off slightly then its sounds like Water pump isent pumping the water around the engine correctly ,but then it should make the engine run overheated.or it could be a slipping fanbelt, but then that should make the Alternator to make a noise,so {throttle to 2000 rpm from idle standind still} and see if there's a noise coming from the water pump area.
The belt should have just a little free movement more on the longest part of the belt(a very little about 1/8' movement
So check it out and let ne know how you get on .
Ron

Nov 28, 2010 | 2003 Nissan Altima

1 Answer

When idling my jeep overheats. The cooling fan is running and it speeds up when temperature goes up. The temperature gets close to 260 degrees and the engine tries to stall. when I start moving it cools...


At idling speed an engine does build up a lot of heat and the cooling fan will kick in. In slow moving traffic or traffic jams the temperature gauge can touch the red - particularly on hot days. The reason it cools down when you start moving is because of the air flow through the radiator.

Presumably there are no leaks from the cooling system otherwise you would have mentioned it. In normal circumstances the fan will not be running as you are driving at speed, as the air-flow through the radiator is sufficient to cool things. The fan only kicks in to get rid of excess heat - and this usually occurs at idling speed or after you have parked the car.

If the fan is running all the time as you drive, this points to either a fault in the fan switch, or the car is running too hot. presumably in normal driving the fan isn't running and the temperature gauge reads normal?

It is common - in stationary traffic many cars overheat (particularly big engined models) try to stall and 'cut out'. Restarting can be difficult until the engine cools down.

Is your car overheating in normal driving conditions or just at idle speed? Overheating in normal driving conditions can be caused by things like a failing water pump, blocked radiator, collapsed hose, faulty thermostat or, in the worst case scenario, cylinder head problems.

Overheating at idling speed is 'common'. Check your coolant level. If your car isn't using/losing coolant then there probably is no major problem. You can flush out the cooling system and refill with new coolant - and also check your radiator. Are the cooling fins crumbling with age? Or maybe they're partly clogged with insects and debris from the road? A blast with a hosepipe wil sort that out ..

The question is how much does your car overheat in normal driving? If it doesn't .. it appears as though you have nothing to worry about as such. Most cars have 2 speed fans... the 2nd faster stage kicks in at some point dependant on engine temperature. Perfectly normal.

Aug 14, 2010 | 2003 Jeep Grand Cherokee

2 Answers

2004 chrysler sebring idle speed is too slow. HOw


why do you want your rpms higher while idling? you don't want them high because your gas bill will reflect that. slow shouldn't matter but if it's dying while on idle it could either be your mass air flow sensor or your fuel filter being clogged

Mar 23, 2010 | 2004 Chrysler Sebring

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My 97 jimmy sometimes dies while driving and idling. no lights come on, fuel pump is working, is not overheating. once it dies, it starts up again immediately.


Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Aug 12, 2009 | 1997 GMC Jimmy

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