warm engine start problem. Ok guys my 94 318 will start every morning fine . turn it on for 30 seconds shut it off restart's fine 4 0r 5 times . as soon as it warms up it wont restart unless i wait 5 minutes or hold the pedal open and crank it for 30 seconds i believe it's a bad crank sensor or coil pack . maybe even a bad dme relay any feed back will help crank shaft sensor on it's way hope that solves the problem. every thing else is new except for the coils . thanks |
I would think it is a relay. Crank sensor would most likely not screw up on a constant basis, also I don't think they stop working then start working. They usually die and never work again. Might be a hard one to track down with a relay sticking or maybe it is in the tune. Maybe too much enrichment when the car is warm. I had the same issue with my car when the DME temp sendor was not plugged in fully. It was telling the DME the car was ice cold so it always started fine when it was cold but after it warmed up it was 30 seconds of cranking with wide-open throttle to clear out the flooded motor from enrichment fuel. It never threw a code for some reason but Barrie found the temp sendor issue when looking at the values in INPA. John S |
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Best of luck finding it, John S |
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Opinon only John S |
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Engine temp sendor. If this is bad and tells the DME the engine is cols all the time is will be a bear to start when warm. I had this issue when my sensor was unplugged and it took like 30 seconds of cranking or more to start my car when it was warm. Bad temp sensor or unplugged will cause starting issues like you are having. Unloader relay on my car is located in with the DME. It is the only relay in the DME compartment. When you crank your car all accessories should turn off until your done cranking... |
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Does all you accessories stay on whenyou crank the car? radio, interior lights, head lights? If so your unloader is not working correctly and you might not have enough juice to fire your coil correctly...Weak spark like you said you had on a hot start Head temp sensor first though since I think that is the issue. Ok JohnS |
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Are you running after market coils? Make sure you check your head temp sendor cause it sounds to me like your car is getting too much enrichment on hot start which would be the head temp sendor. ***The coil low voltage issue would cause issues with cold starts too.*** Another thing maybe a bad starter... check the voltage on a cold start and if it is much higher then your starter is bad and drawing too many amps when it is hot. I've had a bad starter when it was hot it would draw big amps due to a warped armature this was not a BMW but can happen to any starter. If the starter has low voltage on a cold start and starts the car fine then you need to go to my head temp sensor therory. |
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