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|5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)|
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Is it possible that someone installed a limiter from an ETA engine?
it might that be the rev limiter thats causing u probs. it might be a fuel to air ratio prob thts causing ur car to sputter* sputter* sputter* at the rpm u say
take witeshark's tip and recheck fuel metering...
It looks like you need to know more about all the criteria the engine control system uses to set the limiter. I don't know of any way to simply change it manually. Some sensor must be off, and I think your fuel economy is a big clue.
That's what I had been thinking. So I went through the Mass Air, TPS, O2 sensors and checked the injectors for leaks. Replaced many old hoses to tidy up vacuum leaks. Also thought maybe it was stuck in "cold" mode due to bad engine temp sensor but that wasn't it either.
My main theory now is: what if the VANOS isn't cycling? The computer looks for the cam to reposition due to the solenoid energizing just above idle and then reposition back at a higher rpm (which I've read is somewhere in the neighborhood of 4500rpm). If the computer doesn't see the cam reposition, will it prevent further rpm rise? This would also affect fuel metering if the cam is not advancing and retarding as designed. How can I tell if VANOS is working? Mine makes no noise that I can hear as I rev it up and back. Should I be able to hear the solenoid as it picks up just above idle?
if any of the sensors or VANOS wasn't working, it would have thrown a CEL.
Have you done a scan yet? :-)
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