Question about 1999 Chrysler 300M

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Why my motor ildles high

Car was recked set in garage one month installed new radiator now engine idles high when i start car

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Posted on Feb 12, 2009

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1 Answer

Overheating when I sit idle.


Over heating the engine is a serious concern. With the hood raised you should hear the motorized fan turn on just behind the radiator as the engine requires additional cooling.. If you look in from the rear of the radiator you should see the fan blades.

This electric powered motor operates on a thermostat and when the engine temperature rises this fan should come on. I'm assuming from your description that when driving and air is flowing through the radiator as the car travels the engine is nor overheating.

Check fan motor thermostat, check fan motor and check wiring.

Wiring Diagrams related to the Honda Civic
http://www.wiringdiagrams21.com/category/automotive/honda-automotive/civic

Motor engine cooling fan only runs as engine temperature requires additional cooling.
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Jan 05, 2016 | 2001 Honda Civic

Tip

Engine Overheating due to Radiator Fan Motor


Found out PT Cruiser has a 2 speed fan and when engine runs hot in traffic or at idle or low speed it usally means the high speed on the fan motor has gone bad. I bought a new fan motor with the cowling on ebay that is a generic one and it cost only about a $100 with shipping from a company in Tennesee and it has solved the problem now for over 10 months now.

Replacing the radiator fan and cowling was 2-3 hours work even with some help from another person.

Rich

on Dec 18, 2008 | 2001 Chrysler PT Cruiser

1 Answer

Idle speed valve


cold or hot. there are 2, on all suz engines (what transmission, 3sp,4sp or 5sp)
post symptoms, sure bad idle but hot , cold or both
hot means engine is at 180F or more holding......
is hot idle above 800 RPM or Below?
is the idle surging out of control hot?
Does hot idle (spec 800) drop in RPM with cab heat fan on and Headlights turn on at the seam time.? (yes, bad iSC funcition)
if ildle is low, say so, that is cause by other bad parts. (or set wrong)

Dec 11, 2013 | 1991 Geo Tracker

1 Answer

I have a 1990 S-15 with 4.3 motor idles high when you start, idles down , set and idle for a while it starts idling up and down.any idea's?


Could be a faulty idle air control valve.
The computer controls idle speed by regulating how much air enters the throttle body thru the valve.
You could unplug the valve when the idle speed is close to normal, then shut the engine off and restart to see if the idle speed is still in the same place. Unplugging the valve will also set a trouble code and turn the warning light on.

Mar 07, 2013 | Chevrolet Cars & Trucks

2 Answers

1994 crown victoria engine races


Problem with idle speed. The idle is controlled by the pcm (engine computer) through the operation of the Idle Air Control valve or motor. But several other sensors are also at work, like the throttle position sensor, the coolant temperature sensor, the MAP sensor or the Mass Air Flow sensor. The computer monitors all engine conditions to optimize performance and driveability-this includes keeping idle speed correct.
Would probably help you if you could see what all those sensors are telling the pcm-so you need a scanner capable of giving live stream data. And don't forget, your '94 is OBD-1, not OBD-II like all cars since 1996 on have. A garage should have such capable scanners, but they are kind of high end, not your typical cheap code scanner.

May 07, 2017 | 1994 Ford Crown Victoria

1 Answer

My 1993 jeep grand cherokee laredo idles rough after warm up. it also idels high around 2000 rpm at start up sometimes and needs to be shut off and restarted to calm idle speed. whats is causing the...


usually rough Idle is not noticable at high ildle. Once it is idles normally try Disconnecting one injector at a time. If the idle stays the same than that cylinder is the culprit. Remove that spark. If it is wet than do a compression test. Should read better than 100lbs of compression.If compression is good take a spark plug and hook it into the end of the plug wire.Lay it across the intake,start the car and watch for spark. If you have spark than you probably have a bad injector. A miss will cause the vehicle to idle high. The computer is trying to keep the car from dieing out. Hope this helps. No spark do a tune up.

Dec 05, 2010 | 1993 Jeep Grand Cherokee

1 Answer

Vehicle idles high for a few minutes, then shuts


did u use fuel stabalizer? if not the gas can turn into a varsale like substance that can clog fuel filter and reck injector seal's, also check the disributor cap and rotor for condensation, this can happen over a period of sitting

Jun 07, 2010 | 1985 Toyota Pickup

1 Answer

2000chev1500havetoflushheatercoreevery2monstogetheat


I recommend this procedure, starting with a cold engine: Remove the radiator cap, remove the thermostat, re-install the thermostat housing, leave the radiator cap off, start engine and idle for not less than fifteen minutes, then turn engine off. Allow engine and radiator to cool completely, then open the petcock at the bottom of the radiator, and drain completely (there will still be some coolant/water in the system).
Remove the thermostat housing again, then remove the old water pump and install a new water pump, replace the thermostat with a new one rated at 195 degrees, and be sure to install it in the proper direction. Fill radiator with water only (you don't want to waste money on antifreeze until you are sure you have heat), leave radiator cap off, start engine and let it come to operating temperature, not less than fifteen minutes. Turn engine off, and let cool compltely. Fill radiator with water only, install radiator cap, and restart vehicle. Let come to operating temperature again, not less than fifteen minutes, turn off. Let cool completely, drain radiator again if your truck got proper heat in cabin, then refill with the proper mixture of water/antifreeze. This sounds like a lot of repetition, but this will flush your entire system, boost your water pressure, and properly regulate your engine temperature. If the problem repeats in your two month window, have the radiator professionally serviced and the heater core will probably have to be replaced.
Always use the proper type and amount of anitfreeze!

Jan 28, 2010 | 2000 Chevrolet Silverado

1 Answer

Ildleing up and down and running high on the rpms


I had a simular problem on my car, but it is'nt a Pontiac, it's an Mazda 323. I solved the problem to be that the Idle air control valve was dirty, and therefore sticking. This caused the engine to idle eratically and sometimes stall. Sometimes it would even stall whilst changing gear.
On most cars the idle air valve is located at the top of the engine, normally near the air filter. And to be honest is very easy to service. It's just a matter of disconnecting and cleaning it with carburetter cleaner.
You probably know this already lol, I'm not sure if you mean this when you say sensor. Hope this was of some help! :)

Feb 03, 2009 | 2005 Pontiac Grand Prix

2 Answers

High fast idle at start up.


On most newer cars there is a fast idle motor controlled by the computer that will hold the fast idle till the engine reaches a preset temp in the computer then the engine should drop down to the set idle according to specs for that car. If the oil pressure continues to stay low after the idle goes down you may need to replace the oil pressure sending unit or if worse case the oil pump.

Nov 18, 2008 | 2003 Hyundai Tiburon

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