Question about 1998 Ford Explorer

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When motor is cold ,it wont idle when started runs ok when engen warms up

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This is a very common problem with these year ford explorer, the intake manifold (upper ) gaskets are made of a rubber or neoprene type material and in time they get very hard. they seem to seal up fine when there warm due to the expansion of the seals,but on a cold cold start they have shrunk and allow them to leak causing a large vacuum leak. replace these gaskets and your problem should be solved.

Posted on Dec 30, 2010

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My ED Ford wont idle when it is cold but it idles ok when engine is warm?


Hi check electronic cold start valve or sensor ,idle control unit and air leaks around induction manifold.

Dec 17, 2014 | Ford Cars & Trucks

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1995 Buick LeSabre 3.8 Liter Wont start unless I push down on gas pedal like it wants more gas, Why? Runs OK when running


Possibly a bad or dirty Idle Air Control motor. The engine computer controls the operation of this motor to control idle speed. A pintle on the motor extends and retracts, according to signal from the computer. The pintle controls an air passage below it to give or take away air during idle -when the throttle shaft is closed, no air will get into the engine through the throttle body except through the idle air passage . The IAC motor or valve is on the throttle body, with a 4 wire connector. Take it off and look for carbon or coking deposits around the valve's pintle, and in the air passage beneath it. With the idle valve off, plug the connector back on it, then watch the pintle as the key is turned to on. If there is no movement whatsoever, the motor is probably bad.

I have also heard that a bad coolant temperature sensor can cause such a hard start. If the computer does not know the engine is cold, it won't put enough gas into the cylinders for easy starts. The engine needs more gas to start and run when cold.

Sep 13, 2014 | 1995 Buick LeSabre

1 Answer

Rough idle,tps,iac,fuel pump and filter replaced,was running great,then all of a sudden,started running bad at idle,runs ok going down the road...any thoughts?


does it run rough after warm up??or cold too,,u mite have a vacuum leak,,,take some injection cleaner spay,,carb or brake cleaner spray,,seen many different spays used,,,but spay around air intake,,around base,,see if engine will stumble,,also seen temp censer problems,,where its tell the ecu that the motors cold,so it rich-ens the fuel,,injector,,hoped it helped,,

Apr 25, 2010 | 1994 Chevrolet S-10 Blazer

1 Answer

Replaced coolant temp sensor like diagnostic code said too didnt help none.it runs ok going down hiway but when i slow down or come to a stop it stalls out wont idle on its own.


There a 2 coolant temp sensors. One for the guage and the other for the computor. You need to replace the one for the computor. With a faulty coolant temp sensor for the computor, it doesn't recognize a cold start to cycle. You know when the engine idles higher when you first start it up in moring then the idle drops as the motor warms up.

Apr 05, 2010 | 1992 Toyota Paseo

1 Answer

89 dodge shadow. hard start. normal idle cold, fast idle warm. sometimes it wont start until i hear fuel pump activate.


Hello,
The car may be hard to start because it may need a normal tune-up. If the spark plugs are pretty used, they will slowly stop burning as much fuel because the spark slowly gets lesser and lesser. On a cold day the fuel is harder to ignite with a small amount of spark.
Normal idle when its cold means that your cars idle is probably too high. If you lower the idle, the choke on a cold day will keep the idle a little higher until the motor warms and then it will kick back off. If the idle is too high, it will run very rich, smothering itself with fuel, and causing the idle to stay low. When the car warms, its creating better spark when its warm, and with the idle being too high its running at a fast idle.
The car wont start sometimes can be the cause of a few things. If the ground is bad on the fuel pump, it wont make a good connection sometimes for when you turn the key on, the fuel pump dont pump the fuel to the engine. Another one can be that your accessory switch can be loose going to the fuel pump. I think its your ground though. Good luck! Hope this helps.
Have a nice day. -Steve

Dec 06, 2009 | 1989 Dodge Shadow

2 Answers

Colt idle problem.


Most likely you have a bad Idle motor which is a small motor mounted on the intake manifold. If the motor can run better with your foot on the gas but dies if removed then it is probably this. This motor is controlled by the OBDII computer which gets it's control signal from the temp sensor which is located either on the radiator or engine block (which could also be bad), if the electric fan (if equipped) turns on then this is not the problem part, but the idle motor is. Another possibility is that you have some bad /cracked vacuum hoses which should be checked for first, before replacing the idle motor.

Jul 05, 2008 | 1991 Plymouth Colt

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