high rpm bog?

[hendrixvodu]

having an issue with the car, has a bogging feeling at high rpms as if it hits a speed limiter almost... its also random and sometimes it will not do it. changed the maf, filter and plugs...has perfect idle and start, runs great besides.. car is an 84 318i with m50tu from a 95 e36...it has a noisy inline pump im wondering if that could be the issue? ...any info would help, thanks guyzzzz

[matt]

Do you have a check engine light wired up? And do you have your speed sensor hooked up?

[hendrixvodu]

Do you have a check engine light wired up? And do you have your speed sensor hooked up?

the m10's didnt come with cel so i wasnt really sure how to wire it, i have a late model m20 cluster now...and what do you mean by speed sensor ?

[JGood]

How high of RPM's does it cut out at? My buddy had an m50 e34, and the ground wire in the front of the engine, near the lift point, was bad. There is a resistor on that ground wire inside the fuel injection harness housing, and his had failed. His car cut out at around 5k-6k IIRC.

Just a cheap/easy thing to check.

[hendrixvodu]

i will check that out...i have a chip and the red is 7...it cuts at 6ish

[BenM]

Sounds like you may be missing the speed signal from the harness to the cluster and experiencing a soft rev cut.

http://www.r3vlimited.com/board/showpost.php?p=1676063&postcount=3

[jahnaboi]

Sounds like you may be missing the speed signal from the harness to the cluster and experiencing a soft rev cut.

http://www.r3vlimited.com/board/show...63&postcount=3

Don't know why people keep missing this easy fix...

[SamE30e]

It doesn't apply to NV's, or late model car I think.

[BenM]

Don't know why people keep missing this easy fix...

Seriously. Late model cluster should be easy to wire up too.

It doesn't apply to NV's, or late model car I think.

car is an 84 318i with m50tu from a 95 e36

?

[matt]

Sounds like you may be missing the speed signal from the harness to the cluster and experiencing a soft rev cut.

http://www.r3vlimited.com/board/show...63&postcount=3

This is what I mean by speed sensor.

[rThor432]

?

'95 E36 would have the 2.5 technical update (VANOS) motor. That's all he's talking about.

[BenM]

This is what I mean by speed sensor.

Yeah I know. I remembered the soft rev cut, but couldn't remember about the speed sensor.

'95 E36 would have the 2.5 technical update (VANOS) motor. That's all he's talking about.

But all OBD-I cars (or M50TU) need the speed sensor signal unless the they have the speed sensor delete chip, correct?

[rThor432]

But all OBD-I cars (or M50TU) need the speed sensor signal unless the they have the speed sensor delete chip, correct?

Oh yeah, absolutely. Without the signal or speed sensor delete the engine won't rev above 6,300 rpm.

A few other things (like VANOS) are affected by the lack of signal as well resulting in the car not performing 100% ideally. IIRC that is because without the speed signal the DME doesn't sense an engine "load".

[hendrixvodu]

well then thats my problem...any clue where i wire it to in the back of the cluster? i have a 90 m20 cluster but its an 84...so i assume the wiring is different?, thanks a lot guys this saved me a lot of headaches..i really thought it was fuel pump related haha

[hendrixvodu]

anyone know what i wire it to?