Question about 1988 BMW 7 Series

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A 1988 bmw 735 i does not start and floodes the spark plugs

I have checked the spark plugs and the gas flow everything seems fine but for whatever reason it floods the spark plug.i think the gas flow system is reversed i am not sure but it enters through the injectors and return from the top where the fuel pressure regulator is.would you please illustrate the gas flow system and could you help me find out the problem and the solution of course.thank so much.

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  • mulima1966 Jul 21, 2010

    i have not look for the hose yet but i would like to have a picture of the location of the hose in intake manifold.cheers!



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The fuel system is correct the problem could be a simple rubber pipe come off the inlet manifold causing the auto choke to stay on ,this is an ancient vehicle even by spanish standards and on the inlet manifold is a rubber pipe that runs to ignition module for the advance ****** and i think this may have come away from teh manifold where its perished and broke ,have a good look for it because i have had this before on these cars and the black smoke was bad and it just choked its self up

Posted on Jul 21, 2010

  • mulima1966 Jul 21, 2010

    thank you for the time but would you please show me a print out or illustrate this rubber hose that you are talking about where is located exactly i know it may sounds like i am asking too much but just stressed out about this problem.

  • Colin Stickland
    Colin Stickland Jul 24, 2010

    sorry dont have access to a workshop manual for every motor ever made ,but have a look at the injector rail this is the metal pipe that delivers fuel to all the injectors ,its on the end of here that the valve is ,also check all the thin rubber vacumn air line hoses as one of these could be running to something and its perished which is causing the problem



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1988 jeep Cherokee Laredo won't start turns over ,has spark, gets fuel

no engine size stated, (so i toss coin, 4.0L) 5miilion strong.
the 1988 is the gawd awful French RENIX fuel injection.
i owned 2 of these pigs. (sure it runs) but sux.
why?, no CEL lamps , no flash codes, no OBD1 , no OBD ! anything.
only the very old and rare factory and dealer tools can scan this pig.
lets do this better?
in vivid details.
NO start 101: (order matters too)
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  2. spark at all 6 spark plugs good,? not just 1.
  3. car is tuned up. spark plugs.cap rotor, wires, and filters?
  4. the ign timing light on #1 wire, shows spark landing near TDC 0 degrees or under hood stated spec. (open hood look up )
  5. i now check for flooding, is it? spark tips , TALK to me.?
  6. yes, then check fuel pressure. next.
  7. no, then are they dry, you said wet. ('gets fuel means what"?)
  8. if flooding, i unplug the fuel pump relay and start car with test fuel if it runs for 3 seconds and stops, that is a PASS condition so but if not 1, to 7 above was skipped. lets say its flooding
  9. if flooding did you try cranking per opr guide wide open throttle? this CUTS all fuel and clears all flooding on all gas engines. and for sure all EFI. gas engines.
  10. my guess is its running now. right? if here?
  11. if not, check fuel pressure per the fsm cranking, and the MAP sensor. out put voltage key on, and cranking. and post that.
  12. good luck.

get the engine to run on test fuel first. this saves big time labor
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doing a real tuneup , is not ever a waste.
a tuned up engine pays back in lower gas costs. big time.
fuel is expensive.

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