Question about BMW 535

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1988 BMW 535IS stalling

1988 E28 (535IS) runs rough on idle(rpm fluctuates between 600 ang 650) especially when hot and sounds like it is slightly missing. I have replaced all fuel injectors, both fuel pumps, fuel filter, adjusted valves, major tune up but still same. I also have some hessitation when I demand a lot of power; especially in the first gear; like it was struggling for gas.
Then it got worse last week; the car will stall after getting hot and will not start for nothing untill it cools down. Will be doing 80mph and then ....NOTHING! Car shuts off. What a drag.I which it would quit permanently so I can diagnose the issue.
I am thinking it could be the pulse generators(crank sensors), but could use some more ideas before I replace these costly little parts.
ECU or TPS maybe????

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  • AdeNangs
    AdeNangs Dec 09, 2009

    When the car quits, bypass the fuel pump relay located on the side of the fusebox with wires, and see if the car starts back up. An easy way to do this is to use about four strands of bare wires and connect all for prongs on the relay, plug it back in place and start the car. If all works, u have a faulty relay.

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Hi, check to see if your model has the added fuel pump relay under the passenger seat...my friend had almost the exact same problem in his 330......the relay was faulty, and when it got hot, it shut down, resulting in no fuel pump power.......i hope this helps......

jimbo

Posted on Jul 23, 2009

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