Question about 2001 BMW 325

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I just bought a 1986 BMW 325 that starts fine when cold. When the engine is hot and I try to start it puts out black smoke and idles rough and dies. Where do I start to look to fix this?

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I have a 1987 bmw 325i .The car will Start and Stay running and then says coolant ..then maybe 15 mins of driving (city) white smoke and moisture is coming from the tail pipe. What is this ? then it will not keep going I have to let it Sit and then it will Start again. Please please please help

Posted on Mar 26, 2013

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Hi there?
It sounds like it has air leak, make sure the breather pipes have no splits or hols in them.
Most of the time you can actually hear the whistling.
Failing this try and clean the throttle housing with brake cleaner or throttle cleaner.
I'm guessing you have changed the spark plug if not check the spark plugs and checked the points in the distributor cup.
Try this and see how it goes

Posted on May 20, 2011

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Coolant temperture sensor. Look at the front of the cylinder head. There will be a square 3 pin connector. This should be the one you need to replace. What happens is that it is stuck telling the computer that the coolant is cold thus providing more fuel to start. Once the system is warm this excess fuel is not needed and can create the black (raw fuel) smoke that is coming from the tail pipe once warm. This is a very simple repair. Let me know if you need anything else.

Posted on May 20, 2011

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Its a hot start issue.

Can be related to low fuel pressure or problem with crank sensor.


Also it can be weak battery or starter.


But possibilities are to be inspected to confirm what exactly it is.------


To troubleshoot and confirm the issue,i suggest you refer few solved help links with similar types of problem like yours:------


Click the link below:------


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