Car won't rev out :(

[slim91]

Hi all I'm in need of some ideas please I've just finish rebuilding the back end of my car. put it back on the floor, drove it around my car park all fine tested new lsd ;) still all good come and started it today and now won't rev over 5000rpm now. Only thing I've touch since I put it in is the airflow metre tryed disconnecting it and trying still the same out come it had a danth ews delete and raised rev limit... Only mentioned as someone told me it may be the ecu but I'm not so sure thinking of maybe a crank sensor or lambs sensor as have recently taken the out and put back in.

Any idea or help much appreciated pleeeeaaassee

[rich318i]

speed signal 100% car is in limp mode.

clear the faults and revs up to 6.5k but will go to limp mode again
the ECU thinks the ABS is not working. check your wiring as its a common mistake!!!

[slim91]

I've got abs but never had it working alway had the relay out, prior to engine change as well abs light always on. It's worked fine for a few month and wireing is good got a danthe loom.

[rich318i]

its in limp mode not E30 side ABS but the E36 ECU is looking for the signal from the E36 ABS signal 100% thats the problem!!!!

[slim91]

Forgot to mention in the first place I've out an m52 in it sorry

[rich318i]

still.. thats the problem speed signal to ECU

[slim91]

Ow right see I now cheers. Is that a sparky job? Or try changing the sensors first? Thanks

[jmc330i]

Is this a newly finished conversion that's never revved over 5k, or have you been driving it around all fine and it's suddenly limited itself to 5k?

[slim91]

No mate I've been driving it for 6 months or so now and havent had a problem yet

[rich318i]

what have you had done to the diff rebuild ? E36 into a E30 case?

[jmc330i]

No mate I've been driving it for 6 months or so now and havent had a problem yet

As you've used one of Dans looms and the fact it's been ok, you can probably rule out the speed signal.

It's more than likely something you've disturbed, you mention the lambda sensor etc...
I think duff or badly connected lambda sensors will put the engine into limp mode for example.

[E30BeemerLad]

Have you connected the 2 lambda sensors the wrong way around on the top of the engine.

The rear plug on the top of the engine takes the lead from the lambda sensor for the front 3 cylinders and the front plug the rear 3 cylinders.

[slim91]

thats a good point aha i will check the lambda sensors tomorrow. it has driven fine tho for a day? i dont think i have as i did mark them but mistakes do happen aha.

no i havent ive just rebuilt an e30 slipper with porshe dog ear plates some friction plates from america need some new belvil washers to but didnt no where to get any

[slim91]

Hi all thanks for your help its was the fact the osr abs sensor wasn't plugged in

[etouring]

Hi all thanks for your help its was the fact the osr abs sensor wasn't plugged in

Hi Iv got the same problem, but I haven't connected the abs control wires from the E36 loom to anything . What colour wires go to the oar sensor??