Volkswagen Passat misfire

Car: Volkswagen Passat
Variant: 1.8t se
Model Year: 2000

Categories: Engine & Drivetrain

The car is fitted with the APU petrol engine. Had new head gasket, plugs, coil packs and rocker gasket. When on tick over it hunts slightly but when you go to pull away it tries to stall until revved to around 2500rpm. It will then drive but misfires quite badly. The misfire gets less noticeable the faster you drive.
Does anyone have an idea on what may be causing this?... Thanks

Posted: Aug 7, 2015 (9 years ago)

nitrorat

Points: 11

I'd be looking for a vacuum leak,
somewhere that lets unmetered air in "AFTER" the Air flow meter.
And with this engine I usually end up removing the inlet manifold,
the crankcase breather and associated piping is where I find the faults.
and because of it's location it's seldom checked.
hence inlet removal.
And a good time to remove all inlet hoses and eyeball all of them and hose clips.
Crank oil mist can soften and distort the inlet ducting material.

Posted Aug 8, 2015 (9 years ago)

1/4drive

Points: 1,892

Might be worthwhile double checking timing set up correctly .

Posted Aug 8, 2015 (9 years ago)

whittingehame

Points: 38,685

Thanks for the advice guys. I was hoping it weren't a more mechanical prob like a sticking valve or maybe a head gasket blow by.

Posted Aug 8, 2015 (9 years ago)

nitrorat

Points: 11

Turns out that the cable to injector 4 wasnt properly plugged in.