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1989 BMW 735i Hot start issue

rustfarmer on May 23, 2008

" "

After shutting off warmed up engine and sitting for ten mins. or so, upon restart engine runs rough and seems flooded and revving engine several times will clear problem, I know there is a cols start injector, but if car sits for only 2 or 3 mins. problem does not happen. Is it more likely that temp sensor is sending wrong temp, or that injector is slowly leaking down? How hard is it to change this injector?

Comments:

Aug 28, 2008

- Where is the cold start injector and is it easy to swap?

Nov 06, 2008

- where is cold start injector located? My crappy Haynes manual doesn't give any info. Thanks

Jan 11, 2009

- hellow from Joseph .new to bmw.i need specs on sensors any help . appreciated 1985 bmw 735i .runs great until warms and idle slows then starts crapping and shuts down will start after cools off . ------------------------------------------------------------------ new to bmw - ojoseph3rd

Best Solution

posted on May 23, 2008

MsMitch

Rank: Wiz
Rating: 79%, 27 votes

You might want to try replacing your throttle return spring, or at least lift the hood and see if here is a change while it smooths out..

Comments:

May 23, 2008

Look for visible signs of leaking around the cold start injector.
When foreign material gets into a cold start injector, it can leak. This will result in rough idle and backfire.
Residual fuel pressure (pressure remaining in the line after the pump is off) can cause the injector to leak. This can cause hard starting and an overly rich mixture during starting.

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This Problem Also Relates To: 2002 BMW 3 Series 1998 BMW 7 Series 2007 BMW 525xi Sedan 1992 BMW 3 Series 2005 BMW 3 Series 2005 BMW M6 2000 BMW Z3

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