rough starting - suggested that its caused by the oil pump....?????

431 Views 2 Replies 3 Participants Last post by Project20v, Dec 2, 2001

jcorallo

Discussion Starter · Nov 30, 2001

Hello,
When I start my car cold, it *bursts* into life after a couple of cranks - as it should do, and ticks over OK and all is normal.
Now, if after warming up, I run my car hard, then leave it for a *few* hours, on trying to start it back up again, it doesnt start correctly. Well, it starts (just) but wont rev. If i touch the throttle, it tries to die. I have to wait about 15 to 20 seconds with it idling and sputtering like this before it kicks into life and will rev normally.
Its been suggested to me that there could be a problem with the oil pump pressure relief valve sticking open - so when i come to start my car, I'm not getting any lift to the followers.
Does this sound feasible?
Either that or it could be dodgy fuel pressure and/or maybe a vapour lock in the fuel rail?!?

Any ideas?
Cheers.
Jules

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TimM

· #2 · Dec 2, 2001

Re: rough starting - suggested that its caused by the oil pump....????? (jcorallo)

Sounds hokey to me. VW may have a sensor for oil pressure to allow the engine to run, meaning there must be oil pressure for ignitiong, but that would allow the engine to run or to not run not run lousily.
The lifters/tensioner would be noisey if it had low oil pressure one would think...
Sounds fuel related...but don't have enough experience to help...sorry.

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Project20v

· #3 · Dec 2, 2001

Re: rough starting - suggested that its caused by the oil pump....????? (jcorallo)

I really doubt your oil pump has anything to do with it. I sound like you are loosing your rail pressure (fuel pressure). You might check your regulator, a leak, or even a bad injector..........

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