94 740IL has problems starting - vapor lock?

Aug 31, 2005 4 Replies
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Lately my 94 740IL has been having problems starting. It didn't start for



2-3 days over last weekend, started and ran fine Monday but hasn't started since. All the electrical systems in the car are fine, the battery is fine, no other issues going on. Funny thing is, when I drive to work and it won't start at the end of the day, if I wait 20-30 minutes it starts right up, which leads one of my co-workers to think it could be vapor lock. I've only had this problem when the weather is 75+. Any ideas?

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J

Vapor lock is a non-issue in fuel injected cars. I'd be checking my temp sensor.

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D

Oh no it's not. I have an EFI V-8 (not BMW) which suffers badly - but only when you attempt a hot re-start on a very hot day. It will eventually start on a couple of cylinders and come good after some time. But unlike a carb car where you have to re-fill the carbs after evaporation for a cold start the injection makes this instant because of the pressurized fuel rail

But I'd say you're right it's not the reason in this case.

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J

When my 635 did this it was a combination of bad relays and dirty wiring. First thing I'd try is a new fuel pump relay.

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J

Agreed. Probably a bad solder joint or component in the relay. I've seen this on several E28/23/24 models.

JB

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