The car runs well except when idling at lights or in traffic and occasionally on cruise at say 110Km/hr. During the rough idling the engine misses and coughs perhaps missing on several cylinders and nearly dies. It seems to be worse on short journeys in summer and when it gets hot in traffic. The computer shows no fault and the idle speed has been lifted to no affect. It does seem to be getting progressively worse. Can you help.
Hi, the valve springs are bad in this vehicle. this is causing the misfire. this is quite hard for the CPU to pick up. normally, the cam sensor will at times.
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localwonder - thanks for the advice. Checking the internet suggests 9 possible causes (vacuum pipes, Direct ignition unit(DI), Throttle body (TB), mass air flow sensor, low oil pressure sensor, O2 ensor, fuel pump, Coolent temp sensor, Map sensor (what ever that is) idle air control valve. Yours is a new one. I will go armed to my mechanic tomorrw! But cam't possibly replace one after the otheruntil its fixed, where do you start? Cheers.
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