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Bmw e30 m30

Posted: Sat Aug 18, 2012 2:49 pm
by bmw_e30_2011
Hi all,
I have a issue with my car and im coming preety fustrated with it.
Iv done the e30 m30 swap and its been fine, but recently the cars been running like a bag of crap...
Its gained a misfie that i cant seem to budge..i have swapped the coil and afm, changed plugs lead crank sensor fuel pump and still having no joys...it has spark..
Im now thinkin along the line of injectors breaking down or the loom..
Any help would be gratefully apreciated...
Thank you

Re: Bmw e30 m30

Posted: Sat Aug 18, 2012 3:49 pm
by Speedtouch
Check engine to body earth strap. Also try disconnecting the battery or ECU, leaving it for an hour or so to reset it, then let it idle for at least 10 minutes to enable base idle settings to be learnt, switch off, then take it for a drive throughout the rev range.

And check that the TPS functions properly.

Re: Bmw e30 m30

Posted: Sat Aug 18, 2012 3:55 pm
by bmw_e30_2011
Thank u for the added info apreciate it..how can i check tps?

Re: Bmw e30 m30

Posted: Sat Aug 18, 2012 4:12 pm
by Speedtouch
Listen for the click as you open and close the throttle (activate the throttle body lever in the engine bay).

It is a switch that tells the ECU whether the engine is in idle or open throttle mode.

You may want to remove the connector to it and verify that the switch opens and closes using a multimeter on either low resistance or continuity test (buzzer) mode.

Re: Bmw e30 m30

Posted: Sat Aug 18, 2012 4:22 pm
by bmw_e30_2011
Sorry if i sound stupid u said listen for the click is that when the cars running??im assuming when the cars off right...thanks again

Re: Bmw e30 m30

Posted: Sat Aug 18, 2012 4:32 pm
by Speedtouch
Yes, with the car off.

Re: Bmw e30 m30

Posted: Sat Aug 18, 2012 5:03 pm
by bmw_e30_2011
Its seems ok it does click...does the crank sensor have to be a certain distance from the crank...

Re: Bmw e30 m30

Posted: Sat Aug 18, 2012 9:45 pm
by Speedtouch
Yes, it will have to be within a given distance of the toothed crank pulley wheel. Usually within 5-10mm or so.

Re: Bmw e30 m30

Posted: Sat Aug 18, 2012 10:27 pm
by leeparkes
Crank sensor needs to be 1mm from the toothed wheel and resistance should be between 500-600ohm at the plug.

Whats the dizzy cap and rotor like? if you do need to replace them there the same as M20 ones.
Does it smell like its running rich?

Re: Bmw e30 m30

Posted: Sun Aug 19, 2012 5:01 pm
by bmw_e30_2011
The dizzy looks ok and so does the Rotor arm.. The only thing that comes to my attention is the pulse sensor on the 6th lead...when unpluged nothing changes in the cars running..could that be a reason???
Im going to do a compression test now( what should it b reading?) and im goin to recheck the valves...

Re: Bmw e30 m30

Posted: Sun Aug 19, 2012 5:04 pm
by bmw_e30_2011
Yes its running rich for sure...

Re: Bmw e30 m30

Posted: Sun Aug 19, 2012 7:59 pm
by leeparkes
That sensor lead tells the ECU to fire the injectors in banks of 3 when you unplug it all 6 fire at the same time, it will run fine without it connected but will use a tad more fuel.

Re: Bmw e30 m30

Posted: Wed Aug 22, 2012 1:47 am
by bmw_e30_2011
Thanks for all the feed back.
I managed to solve it after all that. I re-ajusted my valve and seems to have solved my misfire..
Im 1 happy chappy..
Thank you fellow e30 zoners

Re: Bmw e30 m30

Posted: Wed Aug 22, 2012 11:14 am
by Speedtouch
Which valve - fuel pressure regulator?

Re: Bmw e30 m30

Posted: Wed Aug 22, 2012 7:29 pm
by bmw_e30_2011
Sorry all of them..they were adjusted by a fellow mechanice and were done to tight..there wasnt enough valve clearance ..but now i have adjusted them it seems to be driving even beter than it did before..

Re: Bmw e30 m30

Posted: Wed Aug 22, 2012 9:57 pm
by Speedtouch
That would explain it.

Good to hear you got it sorted. :)

Re: Bmw e30 m30

Posted: Thu Aug 23, 2012 12:07 am
by leeparkes
Good news.

Re: Bmw e30 m30

Posted: Fri Aug 24, 2012 7:02 am
by bmw_e30_2011
Cheers lads apreciate it