M44 idle issue

Johnwindwood

Dedicated Member
Joined
Nov 14, 2019
Points
42
Location
Bacup
Model of Z
Z3 M44
Guys
1.9 M44 engine. Sometimes when sitting idling at lights etc the revs drop off and it corrects by revving the engine before it drops back to normal. Any ideas as to cause ? Other than this it drives perfectly and never stalls.
Cheers.
 

NZ00Z3

Zorg Guru (IV)
Supporter
New Zealand Zeds
Joined
Dec 9, 2014
Points
158
Location
Timaru, New Zealand
Model of Z
3.0L, 2.8L, 2.0L Z3 Roadsters
Hi John

Put a scanner on it and look for trouble codes in the engine computer (DME).

Then look at the fuel trims to see if any are >8%, which is a sign of a vacuum leak.

Regards

Murray
 

handsomejackuk

Zorg Guru (III)
Australian Zeds
The M44 Massive
Joined
Aug 8, 2016
Points
145
Location
t
they do drop once the car is standing its linked to rotation of the wheel... there was a software mod to write this out of the ecu map.. but it could also be linked to a vacuum leak if the revs are hanging when you are at standstill....

if all that make sense
 
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