Here is same car with one injector for reference...

Fortunately I have two of these in the workshop at the same time, can anyone explain the tailpipe pulse trace on the one that is failing an MOT emissions test, it has no fault codes. The top trace is from a good known vehicle, the bottom trace is from the vehicle is question. The anomaly appears on ...

I have borrowed a donor car now and uploaded a good trace for cams (inlet/exhaust), crank and compression for cylinder 1, traces with VVT solenoids connected and disconnected, files are in the waveform library.

Regards, Simon

Hi all, I have checked the waveform library but no listing for an A16XER engine, does any one have a scope trace for the cam and crank sensors? Preferably with both cam sensor signals and with/without the VVT valves disconnected?

Regards, Simon