Question about 1997 Oldsmobile 88

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Won't start when engine is warm, starts fine when cold and at normal operating temp

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You might want to make sure the vehicle is not overheating. If all checks out, it may be in the ignitions, spak plugs/coils, wires. It could be a leaking injector. Keep in mind, it needs air, fuel, and fire to start.

Posted on Mar 21, 2011

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Posted on Jan 02, 2017

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2002 Ford Mustang GT, CAR STARTS UP FINE WHEN COLD. Hard to start when warm No Check Engine lights come on.


Think about how the vehicle is acting. Starts fine when cold, hard to start when warm. In these computer operated systems, the computer runs everything. Starts fine when cold: the computer has the engine in cold start mode putting more fuel in till it warms up. Temperature sending unit in the manifold sends a message to the computer telling it to stop the cold start mode and it stops dumping excess fuel into the cylinders and it runs fine. IF, mind you, IF the temperature sending unit is faulty, it's not telling the computer to stop the cold start mode and is flooding the engine with fuel cause it's sill in cold start mode. This is my take away on your situation and the temp sending unit is something to check to be sure it's functional. Check it out. I hope this WAS the answer to your problem my friend. It's typical. Luck to'ya Bro.

Jun 06, 2017 | Ford Cars & Trucks

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After I start the engine it runs fine until it warms up to operating temperature and then runs rough and produces black smoke until t dies. It will not re-start normally until it has cooled.


Bad coolant temp sensor making ECU think engine is still cold, thus running rich, as if choke is on. There are two temp sensors, one for dash gauge (one wire) and one for the ECU (two wires). You can remove it and test with voltmeter by placing unit in hot or cold water to compare readings.

Jan 14, 2015 | Cars & Trucks

1 Answer

Car has trouble starting in warm weather


scan data if engine temp. is normal if ok see if there is engine faulty code.
hope it helps

Mar 20, 2014 | 1999 Pontiac Sunfire

1 Answer

Won t stay running when first started. runs fine once its warmed up


This sounds like the temp sending unit for the ecm is bad. There are 2 temp sensors, 1 for the light/gauge and 1 for the ecm. The sensor sends a signal to the ecm to tell it engine temp, the ecm them adjusts fuel mixture for cold or warm engine.This works much the same way as the choke does on a carb for cold starts

Jan 11, 2014 | Dodge Durango Cars & Trucks

1 Answer

My 2004 RX8 won't start when the engine is warm, when its cold it starts no problem. If I drive the car till it at operating temp and shut it down I have to wait an hour until start it again


if this car is on the cold start injector when it is defective. Injects additional fuel to the engine is still warm. Is it to feel warm by running more than normal gasoline smell?

Mar 15, 2011 | 2004 Mazda RX-8

1 Answer

2.0d x-type 2005 Est. Starting problems when engine is warm


Ok, time for car school. The vehicle is operated by the computer, every electrical concept that is. When the engine is cold, it starts fine because the computer has placed it in "cold start mode", putting more fuel into the engine than normally would until Once the engine is warmed up, a temperature sending unit or temp sensor tells the computer to change to normal run mode. IF said temp sensor is faulty and is not telling the computer to make said change, it stays in cold start mode, still dumping excess fuel in the engine that is now not required, cause it's warmed up. Like keeping the choke closed on older vehicles. Now I think you can answer your own question, when this no start action is happening after warm up and it always starts fine when cold, what's the first thing you check ? Right, the unsuspected temp sensor. Change that and no more start problem. Have a wonderful day. Glad I could be of service.

Jul 11, 2017 | 2005 Jaguar X-Type

1 Answer

When the car is warm after a while it is hard to start, takes a few cranks. when it starts it smells like fuel. on cold start it is fine.


Kinda sounds like the ECM or "start mixture" control module is faulty or is getting a bad input from a sensor. For example, it man not be getting a proper temperature sense from the exhaust manifold or the intake manifold water temp sensor. So, every start seems like a cold start....

If your cold start is on a "cold" engine - fine. If your cold start is on a "warm" engine - problem. Mixture is too rich for a warm engine.

Again, could be sensor sending a bad temp signal... or the control module not responding to the signal.

A bit too complicated a problem to exactly troubleshoot via long distance... but you now have a starting point.... -Jim

Oct 23, 2009 | Chevrolet Suburban 2500 Cars & Trucks

1 Answer

2000 maxima has erratic idle on cold days and will stall out on extremely cold days. Also, have noted antifreeze leak (on ground) on those really cold days. Car runs fine once it reaches normal operating...


It sounds like an engine temp sensor is open.. When your engine is cold or anti-freeze is cold your ECU or ECM gets a signal from the temp sensor for cold engine start. It would make sense that it works fine when hot because the resistance on the sensor is a lot lower. Take an ohm meter if you have one and check the resistance across the temp sensor pins. When the engine is cold the resisitance should be really high. Start and warm up your car to normal temp and check it again. It should be a lot lower now. If not replace it. Hope this helps.

Sep 24, 2009 | 2000 Nissan Maxima

1 Answer

Oil pressure high when engine cold. but fine when engine is warm


It is normal for oil pressure to be higher when the oil is cold. As the oil heats up, it will thin out. Since your oil pump is driven faster with the acceleration of the engine, your pressure will also increase. On a engine up to full temp, your oil pressure will probably be around 20 psi and maybe up to 60 at full load. But on a cold engine, you may see 60 psi at idle. I dont know if your high oil pressure is causing your vehicle to stall, but maybe your running the wrong weight/type of oil for your truck. If you live in a extreme cold area, you may want to look into a block heater to help warm up your engine faster.

Mar 14, 2009 | 2001 Chevrolet S-10

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