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What would let the engine start when its cold but when its warm it will not start

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Fuel pump failure,fuel pump relay failure,ignition control module getting hot,on Mercides A1 sensor(crankshaft position sensor).....the list is endless so you might need to check the absence of either spark or fuel to start with.

Posted on Apr 11, 2015

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Posted on Jan 02, 2017

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2000 ford excursion starts up fine after about an hour when the engine warm up and turn it off it will not restart but it seems after it cools it starts fine and go through the same process


The temperature sending unit tells the computer that the engine is cold when first started. After engine is warmed up, if the computer things engine is still now warm, it's still in cold start mode and dumping too much fuel into the engine and flooding it making it hard t start or no start at all. I'd have the temperature sending unit in the engine replaced to see if it's cured. It's separate from the gauge or light and they would show warmed up, but the computer is not getting the message.

Oct 13, 2014 | 2000 Ford Excursion

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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

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I have a 1985 mercedes 500 sl. It starts fine but when the engine is cold it has no power until 300 rpm. as the engine heats up this condition gradually goes awy. I have tested the EGR valve and it op


Friend, you have a faulty temperature sending unit. Change THAT and you'll have this problem no longer. The temp sending unit, when cold, will put the engine, by the computer, into cold start mode, the engine starts getting a bit more fuel until is warmed up, then the sending unit tells the computer it's warmed up and shuts down the cold start mode. Only makes sense, Right?

Nov 03, 2017 | Cars & Trucks

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Ok I have a toyota corolla AE91 ... It starts it runs for 20 minutes or so then it stalls. The engine cranks but does not fully start. It only restarts when the car has cooled down. My mechanic changed the...


One possibility is that the engine coolant temperature sensor is faulty and is stuck in full cold mode. Lots of fuel is scheduled for cold starts, however, as the engine warms up, it needs less fuel. Too much fuel when warm and the engine floods out or riches out. The engine coolant temp sensor is telling the computer that the engine is ALWAYS cold even when it is warm. So, too much fuel is being sent once the engine is warm.

Feb 13, 2011 | Toyota Corolla Cars & Trucks

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Good day: I don't accept that cold starting an engine at 2000 RPM is OK. Those immediate revs on a cold engine are wearing out parts that need oil lube and warm-engine clearances. Is there a simple way of...


I have heard that Fords theory behind that is to supply maximum oil pressure to moving parts sooner. All the Ford products do this and the motors last well into the hundreds of thousand of miles. I wouldn't be to worried about it since there is no issue with it to my knowledge and there is no way to limit the cold start RPM's.

Cold start warm ups are a thing of the past. Better lubricants, engines, fuel injection and other computer controls have made start ups easier on the engine. 30 seconds is barely enough time to warm up anything and after a few seconds oil has already reached all of its intended lubricating points. That first few seconds is the hardest on the engine. Regardless of how any RPM's it is turning.

Oct 20, 2010 | 2000 Ford Taurus

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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

2 Answers

Starts good on a cold start. As it warms up, it


Sounds like the automatic choke is sticking.

Feb 25, 2010 | 1989 Cadillac Sedan DeVille

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

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Cold starts ok warms up shakes and stalls


check engine coolant temperature when it gets warmer, or at operating temperature, and verify that the temperature gauge is showing warmed up to operating temperature. If the coolant temperature sensor tells the computer the engine is cold it will over fuel and miss and the engine will die. When cooled down it will run fine until it warms up. Also could be coil if it starts missing after warmed up.

Aug 18, 2009 | 1990 Ford Bronco II

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