Thanks for confirming that Rob I thought it was CIM but not being a expert on vauxhall wasn't sure if the said 'SIM' was also fitted there somewhere.

Matt

*Sorry that should have said SIM not CIM

Hi, I don't know the network topology off my head on a vauxhall but sure there will be 2 seperate networks ( high speed and low speed network). I would print a network diagram and establish if every module you can't communicate falls on the same network then decide on the next test after that . You ...

Hi.

Have you checked the key on timing gears?

Matt

Hi, Could you give the engine code as there are about 5 differnt engine codes on the mk4 1.8T. Think the early AGU had an ign amp that was prone to cause problems. Also on most engine codes ign coils and coil wiring harness caused problems. Becareful changing lots of parts as I have seen many times ...

and all exhaust from cylinder head to post lambda section?

The 3000 rpm fuel trim results will be vital to the next step.

When you performed your smoke test did you have throttle plate held open?

Have you checked for air leaks around the lambda probe?

Matt

Hi.

What are fuel trims at idle and say 3000 rpm?

If you cant measure fuel pressure try scoping fuel pump current as it may give some clues on fuel pressure.

Hi, I belive that technodiagnostics do truck package too, so maybe worth checking that out. Passenger vehicle software is good on french and Italian.

Matt

when I posted my waveform it was only to help you set up the scope. The actual waveform will differ becuase
A. It was air flow meter not MAP
B. It was not a perfect waveform - just one I happened to have on laptop.

Hope that didn't confuse you - sorry if I did.
Matt