1989 m30 B35 no start

Post here for mechanical and engine topics such as fuel issues, transmission problems, rough idle, exhaust, electrical issues, etc

Moderators: GRNSHRK, ron, bfons

Post Reply
User avatar
89bigcoupe
Posts: 45
Joined: Tue Jul 16, 2013 9:30 pm
Location: New Jersey
Contact:

1989 m30 B35 no start

Post by 89bigcoupe »

Hello Bigcoupe, I've been having a strange issue with my 1989 635. It all started when I was driving down the road and suddenly the car would not take any load, but it wasn't misfiring. So I stopped and fount out that the MAF was unplugged. However even after I put it back in it still was running poorly and would not take even quarter throttle.

So the car is now sitting on the lift and I've done a few checks- I've bought a working MAF from a junkyard E34 535 (b35 engine) and no luck there. I found that for whatever reason the car would sometimes start with the new fuel filter on backwards. The distributor rotor had a large amount of corrosion on it so I am sourcing out a new one. But in the meantime I can't tell if it is a fuel problem or a spark problem. The car has plenty of fuel pressure, so perhaps it is a spark issue.

Anyone have any expirence with the B35?
2001 Titan Silver 330ci Convertible
1989 Schwarze 635csi Factory 5 Speed
1971 Ginetta G4 DARE edition

1988 AlpineWeiß 535is 5 speed - sold
1988 AlpineWeiß 735i Factory 5 Speed - sold
1978 SAAB 99 Turbo Coupe Pro Rally - sold
User avatar
Brucey
6 Series Guru
6 Series Guru
Posts: 10077
Joined: Fri Apr 09, 2004 7:17 am
Location: Cambridge, UK

Post by Brucey »

you need

- fuel pressure
- spark
- injector signal

so first things first, check for those.

cheers
~~~~~~~~~~~~Brucey~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
User avatar
89bigcoupe
Posts: 45
Joined: Tue Jul 16, 2013 9:30 pm
Location: New Jersey
Contact:

Re: 1989 m30 B35 no start

Post by 89bigcoupe »

A little late but I might as well update this in case anyone has seen this and wants an update. The issue ended up being the Crank Position sensor. Fairly common issue and in fact I didn't even have to replace it- the bolt came loose and had to be retightened.
2001 Titan Silver 330ci Convertible
1989 Schwarze 635csi Factory 5 Speed
1971 Ginetta G4 DARE edition

1988 AlpineWeiß 535is 5 speed - sold
1988 AlpineWeiß 735i Factory 5 Speed - sold
1978 SAAB 99 Turbo Coupe Pro Rally - sold
Post Reply