Misfire mission

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MY VR Commodore has been misfiring when idling. My mechanic told me I needed spark plugs, spark plug leads, injectors cleaned, coil pack, DFI module. After my mechanic did the tune-up the engine still misfires when idling but not when driving. What causes this?

Answered by CarsGuide

23 September 2004

CarsGuide team

YOUR mechanic has covered the most common causes of a miss. The next things to check are vacuum leaks and fuel pressure. Start with the vacuum leaks, and look for leaking vacuum hoses or a leaking intake manifold. Next check the fuel pressure, which might show up a faulty fuel pressure regulator.

Disclaimer: You acknowledge and agree that all answers are provided as a general guide only and should not be relied upon as bespoke advice. Carsguide is not liable for the accuracy of any information provided in the answers.

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