1986 BMW 325es with an odd problem

Asked by Jun 04, 2012 at 10:40 PM about the 1986 BMW 3 Series 325es

Question type: Maintenance & Repair

Sometimes when it sits in the hot sun, it will not start.   But it does not happen all the time.  It sounds
like it is not getting gas; not a dead battery.  After the sun goes down, it will start.  The gas tank is full.  
The battery and fuel pump are both relatively new.  My mechanic could not find the problem.  i left the
car in his lot for a week but every time he tried to turn it on, there was no problem.  Any ideas about
what is causing this promblem?

3 Answers

257,865

http://forums.bimmerforums.com/forum/showthread.php?t=304014&page=2 ..........Read post #29, I think this might be a fix for you. It could be due to the clearance on the starter motor, moving just enough in the heat, not allowing it to start. Good Luck!

115

I'm not sure where you live, but it could be vapor lock due to the ethanol in your fuel. Alcohol has a much lower boiling point than gas and it will boil and then it doesn't allow your fuel pump to work, so your fuel injection won't work. Just throwing it out there...

2 of 2 people found this helpful.
5

if you have a security system than check it or override it, the AFM could have a faulty air temperature sensor but do not know if that would keep the car from starting at least..

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