Thread: Please help cam sensor fault

My understanding of the function of the cam sensor is that it establishes the position of the motor IE which cylinder it has shut down on, so that starting is facilitated, ie the motor does not have to do a full revolution for the ECU to find the gap in the sensor gear on the flywheel.

If faulty It is usually associated with slow starting.

AFAIK the crank sensor then becomes the primary source of signal for the ECU while the engine is running.

You really need a scan to establish the faults recorded as it could be crank sensor, O2 sensors , or MAF, or faulty coils or leads . I would tend to think coils or leads from your description.
Regards Philip A

I'd go for the MAF sensor first for these symptoms, i've seen cases when generic OBDII readers gave erratic readings on D2s, even though the petrol engine should be OBDII compliant the diagnostic protocol is a bit LR specific

Originally Posted by ENGINE MANAGEMENT SYSTEM - V8; 18-2-22 DESCRIPTION AND OPERATION

In the event of a MAF sensor signal failure any of the following symptoms may be observed:
l During driving engine rev/min may dip, before recovering.
l Difficult starting.
l Engine stalls after starting.
l Delayed throttle response.
l Emissions control inoperative.
l Idle speed control inoperative.
l Reduced engine performance.
l MAF sensor signal offset.

X2 for MaF.
Unplug the maf and see what difference it makes,, all v8,s will throw at least one crank angle sensor in its life

Thanks everyone for the reply, the maf has less then 1000ks on it I got it new right before the first motor did a ring, but i have also swapped in a known working used maf no change, new leads, plugs and swapped the coil pack with a known used spare i had, also I have replaced the crank sensor, I have had it on a scan tool and the error is po340 camshaft position sensor, I guess the only real thing left is the ecu, is anyone near enough to me with a nanocom or similar that is able to sync it to the car able to come to my rescue?

But did you check the MAF's feed and circuit untill the ECU too?...and just for peace of mind check fuse F2 in engine bay fusebox