engine wont rev please help

[dazcompact]

hi im new on hear iv tryed a few places to try and get this problem fixed but no joy... hear goes
iv just bought a m reg 316i compact done 107k engine runs wel no noice and is smooth but it wont rev over 4000 rpm iv chainged the air flow meater and its got alot more responcive but still wont rev any help would be great

cheers

[dazcompact]

some one has got to no whts wrong with it

[BMW POWER]

may be something to do with the injectors

[96_323]

No cant imagine its anything to do with the injectors. Whats it like when it revs? Is it hitting the 4k mark like it hits a rev limiter or is it struggling to even hit the 4k line??

[tonysticks]

Does it idle near 700 RPM or 500 ?

[dazcompact]

hi it revs around the 500 mark and it gets 2 4000 rpm quite quick and just limmets. before it was a bite ropey with flat spots so i chainged the air flow meater and it goes alot better but still limmets at 4000 rpm

[tonysticks]

When I bought my car, it was idling @ 500 RPMs which is really weird because all E36's I've seen were idling at 700 or 750. I've noticed also that when I drive the car very hard, the engine will cut off around 4000 or 4500 RPMs instead of 6000 or 6500. At the end, I found out that the instument cluster which was installed in my car was not the original one and that the previous owner of the car has replaced it somehow with a 6-cylinder cluster (my car is 318is M42). After, I replaced the instument cluster all together, my car is now idling at 700 and will rev until 6500.

I'm not sure if this is the same case as yours, but thought I'd let you know. Maybe it'd help. Of course, if your car used to idle at 700 and that the problem is new, then you don't have the same problem like mine.

[dazcompact]

i will give it a try i bought the car 1/5/09 and the car has done it sence iv had it and the other thing iv notest is that the mpg on the dials is not working

[tonysticks]

I believe you can get the corrent instrument cluster p/n from realoem.com . After that, you can easily remove your instrument cluster and compare its p/n with the one from realoem. If you found it to be different, then you can look for a replacement.

[dazcompact]

would the cam or crank sensar have anythink to do with it