Is my engine Misfiring?

My car started mis-firing, so I took it to a garage and had new spark plugs and new coils put it but it doesn't seem to be running the same and still mis-firing.

My mate came round with diagnostics and it's saying mis-firing cylinder four. The coils have been checked over and moved around and so have the spark plugs, but doesn't seem to have fixed it. What could be wrong with my car? Can anyone help me please

Asked on 28 January 2011 by Ash23

Answered by Alan Ross

So have you checked to make sure that you have a spark actually at the plug? Failing that you may need to carry out a compression test on all the cylinders (for comparsion to number four cylinder). If the reading is low, it could be a valve, valve seals, or piston ( not sure of your mileage). If the readings are OK, then check your TDC sensor (is known to play up on Meganes).

Tags: technical issues owning engine

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