Camshaft Position Sensor.

Dave Lindsay

Newbie
Joined
May 22, 2018
Messages
4
Location
Edmonton Alberta Canada
Model of Z
Z3
1998 Z3 1.9L , 65,000 miles.
When I was replacing the serpentine belt I noticed that the belt had chaffed and shorted the CPS cable down to bare copper. So I snipped the cable and isolated the conductors. Engine pulls really well but has a rough idle.

The cable was improperly routed and I also suspect that the cable had gotten pinched by the belt as well, because a slight tug and it pulled out of the sensor. New CPS coming in the mail.

Would this be the cause of the Rough Idle?
 

colb

Zorg Guru (IV)
British Zeds
Joined
Nov 25, 2012
Messages
1,190
Location
Newport, South Wales,UK
Model of Z
Z3 M43 1.8 (1999) and Z4 E85 2.5 (2003)
Could well be the cause, CPS is a really important sensor can affect running if failing and be the cause of a non starter if completely duff. Hope you got a OEM replacement, cheap pattern parts are not such a good idea.
 

littlefeller

Zorg Guru (IV)
British Zeds
The M44 Massive
Joined
Oct 18, 2015
Messages
2,918
Location
evesham
mine wouldn't run with a duff sensor, left me stranded. I brought a cheap replacement, fitted it then went for a drive, after about 1 mile it just cut out. it would start but just kept cutting out.
mine still idles a little rough even with the new sensor though.

to be fair most M44 engines sound a little lumpy :)
 

Dave Lindsay

Newbie
Joined
May 22, 2018
Messages
4
Location
Edmonton Alberta Canada
Model of Z
Z3
mine wouldn't run with a duff sensor, left me stranded. I brought a cheap replacement, fitted it then went for a drive, after about 1 mile it just cut out. it would start but just kept cutting out.
mine still idles a little rough even with the new sensor though.

to be fair most M44 engines sound a little lumpy :)
Thing is, my CPS is disconnected ! And it runs great and is smooth off of idle !
 

t-tony

Zorg Expert (II)
Supporter
British Zeds
#ZedShed
Joined
Dec 31, 2013
Messages
38,861
Location
Torksey Lock,Lincoln, England
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Z4 3.0 Auto
Not sure how that could be unless it's in "limp home mode" and running solely off the crank sensor. You would notice a huge difference with a cam sensor in the circuit I'm sure. Can you post some pictures please?

Tony.
 

Dave Lindsay

Newbie
Joined
May 22, 2018
Messages
4
Location
Edmonton Alberta Canada
Model of Z
Z3
Not sure how that could be unless it's in "limp home mode" and running solely off the crank sensor. You would notice a huge difference with a cam sensor in the circuit I'm sure. Can you post some pictures please?

Tony.
CPS is still in the mounting hole, but damaged cable has been snipped of and wires isolated with heat shrink. Only thing I can think of is a 'hack' further towards where it plugs in. But I am not peeling back the upper manifold until the sensor arrives. At that time I will post photo's.
 
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