M42club.com - Home of the BMW E30/E36 318i/iS

DISCUSSION => Engine + Driveline => Topic started by: difriri on July 14, 2017, 06:00:31 AM

Title: M42 hesitation
Post by: difriri on July 14, 2017, 06:00:31 AM

Hi guys!

I'm the proud owner of an E30 ph1 coupe with a 316 m10 spiced engine and a E36 ph1 coupe M42 318is.

I'm having trouble on the M42.
The engine feels hesitating when throttling at about 2000rpm.
What I feel is that when I speed up on the pedal, the answer of the engine isn't the same, it hesitates, like there's something pulling it from behind (I already checked twice and there isn't any sumo fighter in there ;D).

Replaced the fuel filter and the vacuum box on the intake for a very similar one (since our's no longer available and mine was wasted) and felt some improvements, but the hesitation is still there and is annoying me.

Any suggestions from de M42's gurus about what can be?

Thank you!

Title: Re: M42 hesitation
Post by: difriri on July 16, 2017, 12:26:28 PM

Guys, any help here?

Title: Re: M42 hesitation
Post by: colin86325 on July 17, 2017, 11:43:12 AM

Can you pull any error codes?

Title: Re: M42 hesitation
Post by: Dboy3er on August 15, 2017, 01:57:21 PM

Check your fuel supply first, That has always been my M42s issue. It started to eat fuel pumps up FAST. Turned out to be loads of rust in my gas tank causing it, so check either of those.

Title: Re: M42 hesitation
Post by: DesktopDave on August 26, 2017, 07:08:39 AM

I'd do a fuel pressure test and also a smoke test for manifold vacuum leaks. The rat's nest of preheater & icv hoses under the intake tend to leak at high mileage. Also check the crank position sensor for resistance.