Question about BMW 750

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1989 BMW 735i Hot start issue

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?

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  • David Harrelson
    David Harrelson Aug 28, 2008

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

  • David Harrelson
    David Harrelson Nov 06, 2008

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

  • ojoseph3rd 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

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  • 41 Answers

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..

Posted on May 23, 2008

  • Patricia Mitchell
    Patricia Mitchell 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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