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Is200 Misfire Mystery


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Can anyone shed any light on this for me?

I've got an IS200 93 plate and last week the engine management light came on. This turned out to be a misfire on both 1 & 2 cylinders, but this only happens when the engine is warmed up and I've done about 7 miles. A garage has looked at this and it doesn't stay on those cylinders, it randomly switches across all 6! They don't know what it can be but have ruled out a gasket failure. Has anyone out there had anything like this or have I bought a "Christine"? It runs really sweet until it gets hot.

Could it be coil packs overheating?

Any input would be most appreciated

Many thanks,

Paul

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fuel injector(s) would be where I would start. Unlikely to be coil packs unless it is a single error on one cylinder that moves with the coil pack.

It isn't unknown for a single fuel injector to provide misfire errors across multiple cylinders.

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you can disconnect the wiring and measure the resistance, it should be between 13.4 and 14.2 ohms.

Even if the resistance is correct there can still be problems. Ideally you remove them and test on a bench to make sure they output the correct amount of petrol and don't leak.

You can just move them to different cylinders see if the error(s) being recorded move with the injectors. They are a bit of a pain to get to so this isn't something you want to keep doing and if you remove any you should replace the o-rings to make sure they don't start leaking.

As with all these things the cost in labour to diagnose (if the mechanic has the knowledge and correct tools) can outweigh the cost of just replacing parts.

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