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#1
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BMW 520 i SE 1989
Problem with cold starting. Hit or miss. If you miss it, car floods
and I have to wait for a while to have another go. If it kicks in, I still have to wait a while for engine to warm up before I can drive away otherwise the engine cuts off and of course the steering locks. Is it something to do with the auto choke? Either way, what can I do to solve this problem. Would be most grateful for ANY help or suggestions on the above. Fiddler -- Posted at author's request, using moderated http://www.AutoBoardz.com interface Thread archive: http://www.AutoBoardz.com/BMW-520-SE...ict247866.html |
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#2
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BMW 520 i SE 1989
> Problem with cold starting. Hit or miss. If you miss it, car floods
> and I have to wait for a while to have another go. If it kicks in, I > still have to wait a while for engine to warm up before I can drive > away otherwise the engine cuts off and of course the steering locks. > Is it something to do with the auto choke? It doesn't have an auto-choke. It has Motronic fuel injection. Could be a few things. Temperature sensor (or it's wiring) may not be telling the ECU that the engine is cold. -- Who needs a life when you've got Unix? :-) Email: , John G.Burns B.Eng, Bonny Scotland Web : http://www.unixnerd.demon.co.uk - The Ultimate BMW Homepage! Need Sun or HP Unix kit? http://www.unixnerd.demon.co.uk/unix.html www.Strathspey.co.uk - Quality Binoculars at a Sensible price |
#3
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BMW 520 i SE 1989
In article >,
John Burns > wrote: > Could be a few things. Temperature sensor (or it's wiring) may not be > telling the ECU that the engine is cold. IMHO they usually fail the other way round - causing overfuelling. -- *Don't worry; it only seems kinky the first time.* Dave Plowman London SW To e-mail, change noise into sound. |
#4
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BMW 520 i SE 1989
On Jul 7, 3:22*am, Fiddler > wrote:
> Problem with cold starting. Hit or miss. If you miss it, car floods > and I have to wait for a while to have another go. If it kicks in, I > still have to wait a while for engine to warm up before I can drive > away otherwise the engine cuts off and of course the steering locks. > Is it something to do with the auto choke? Either way, what can I do > to solve this problem. > > Would be most grateful for ANY help or suggestions on the above. > > Fiddler > > -- > Posted at author's request, using moderatedhttp://www.AutoBoardz.cominterface > Thread archive:http://www.AutoBoardz.com/BMW-520-SE...ict247866.html HI, I've seen this problem on other cars I've worked on. It turned out to be leaking gaskets on intake manifold and leaking engine vacuum lines. On older engines, the heat destroys these parts and it's hard to diagnose it down to one vacuum line or one gasket on the manifold. After I replaced all vacuum lines with silicon ones and put new gaskets for intake manifold all these odd problems went away. The engine also ran much smoother. Is your engine running a bit rough when it does run? Have you run any computer diagnostics on it? What's the mileage? Good luck, Oskar |
#5
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BMW 520 i SE 1989
Fiddler > wrote:
>Problem with cold starting. Hit or miss. If you miss it, car floods >and I have to wait for a while to have another go. If it kicks in, I >still have to wait a while for engine to warm up before I can drive >away otherwise the engine cuts off and of course the steering locks. >Is it something to do with the auto choke? Either way, what can I do >to solve this problem. There is no carb to flood and no automatic choke. Before doing anything else, I would do a very careful search for vacuum leaks, check the air mass sensor, and carefully inspect the hose between the air mass sensor and the throttle body. I'd also make sure the throttle body isn't gunked up and that the throttle is moving properly while I have the thing out for inspection... it wouldn't hurt to clean the throttle body anyway. If that doesn't do it then it's time to start checking other sensors... --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
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