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[Glyn]

Morning all.
I have been getting more and more frequently a misfire when first started in the morning. The misfire will sometimes last just a few seconds and then clear. Other times like this morning three or four mins.The code is P0303 cylinder 3 misfire detected. It is always the same code. I have changed the plugs, made no difference. There is no oil in the wells. As there are no HT leads I have replaced the coil pack with a Bosch one feeling confident that must be the problem, and obviously it wasn't.
Any ideas anyone
Thanks

[Andy B]

I know the engine isn't quite the same but it's similar  ;)SWMBO had a 16 valve Astra that had a problem with a misfire. A change of plugs sorted it ..... for a week  So I put a pattern coil pack on it! Sorted! For just a couple of days. Speaking to Dr O of Ellemere Lookers he advised that these inlet manifolds foul up  :-/ (I trusted his 30 years playing with assorted Vauxhalls) and to try injector cleaner. I removed an induction hose from the manifold and sucked some directly to the manifold & the rest went in the tank.
Sorted!  But the car was only then on the road for a few months before it was written off. 

[Glyn]

Thanks for the reply Andy.
I have already tried injector cleaner, although only through the tank. Also I would have thought if it was a bblockage of some sort it would be permanant. Mine is intermittant, and once the initial misfire has gone the car will run fine all day.

Glyn

[feeutfo]

Is it worth swapping an injector to another cylinder and see if the fault follows it?  :-?

[Glyn]

Is it worth swapping an injector to another cylinder and see if the fault follows it?  :-?

Yes probably. I have not done that before is it easy or hard job.
Glyn