Vectra 1.8 VVT - weird misfire

Honest John Back Room » Technical matters
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Mon 2 Sep 2013 17:34
Vectra 1.8 VVT - weird misfire - Archie
Hi all. My Vectra has developed a strange misfire. It starts fine and accelerates fine when cold, but when it is hot there is a misfire that is especially obvious when accelerating from 2500 rpm. There is no fault light, economy is not affected, but the misfire is starting to creep down the rev range. It only happens when the car is moving. When stationary the tickover and throttle pedal response are fine. Is it coil pack, MAF sensor or a vacuum leak?

Archie
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Mon 2 Sep 2013 18:10
Vectra 1.8 VVT - weird misfire - madf

Coil pack failing when warm.

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Mon 2 Sep 2013 18:25
Vectra 1.8 VVT - weird misfire - Peter D
The mis-fire will be damaging your cat convertor. Get it sorted sooner rather then later or will will end up with a large bill. Regards Peter
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Tue 3 Sep 2013 14:04
Vectra 1.8 VVT - weird misfire - Archie
Many thanks for the responses, alas changing the coil pack didn't fix it. Running out of ideas now.
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Thu 12 Sep 2013 17:49
Vectra 1.8 VVT - weird misfire - Archie

Turned out to be the VVT system, pulley on inlet cam shot.

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