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- This document was written because my VE Commodore began to misfire one day on the way home from work.
Previous to this problem, I had intermittent missing symptoms when starting the engine on cold mornings.
(In my case, the engine would run very rough, with the instrument cluster displaying an ESP disabled or check engine warning immediately after starting).
Once the engine had warmed up (I.E. after leaving the engine to run in this state for a period of 60 seconds), I would turn off the ignition,
and restart the engine. 90% of the time this was sufficient enough to get the engine firing on all cylinders, and running normally.
On the way home from work one day, the engine permanently developed a misfire.
Using a scan tool, the scan tool reported a P???? error code (Cylinder 4 fuel injector circuit fail).
At least with this error code, I had something to work with in order to repair the problem.
The following diagram may help when dealing with diagnostic trouble codes read via an OBD Scantool or reader.
This image outlines the cylinder numbering used by GM (Holden, Pontiac, Chevrolet, Vauxhall, Buick and Cadillac) for their V8 Engines.