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[megaomega123]

I have developed a missfire. It is popping and banging when revved hard.  It is doing it on both gas and petrol. Seems to be coming from only the drivers bank. Plugs and leads are all good on that side. It misses when driving normally.
It started maybe yesterday but I put it down to the gas needing recalibrated but switched to petrol today and still same.
Did oil and filter and air filter yesterday and camber today. Thats the only recent work.
Any ideas?

[JamesV6CDX]

Any codes stored Rob?

To be honest the gas shouldn't need re-calibrating often - once setup, it should just work, and the ECU will learn itself...

Is it worse on one fuel or the other?

[JamesV6CDX]

Check also you didn't disturb the air temp sensor or the MAF sensor when changing the air filter!

[megaomega123]

Hi James
It is slightly worse on gas but negligible. I'll check the MAF but it did start before I changed air filter. Would that only affect one bank. Oh I also removed the downpipe heat shields today but am 99% certain that the lambdas were unaffected.

[Iain]

My recent misfire was due to a knackered EGR valve

[megaomega123]

My recent misfire was due to a knackered EGR valve

I did blank that off a few weeks ago. I have just unblanked it but still the same.
It seems to be taking ages for the revs to drop back to idle after blipping the throttle too. It was cutting out on gas when clutch in but now seems to idle at 1500 before slowly dropping to normal.
Would ICV cause misfire? The EGR may do as all the missing seems to be coming from that side or is that just coincidence?
I am at a bit of a loss.

[cem_devecioglu]

if you are sure theres no ignition problem
try a compression test ..this may clear the picture..

but also I think you must have some codes stored..

[megaomega123]

if you are sure theres no ignition problem
try a compression test ..this may clear the picture..

but also I think you must have some codes stored..

Still have a code19 stored but have had that for ages, not sure it would cause misfire either. I get code 19 (incorrect rpm signal) with engine running and when not.

[Shagma]

My recent misfire was due to a knackered EGR valve

How did you find out about it..? did you blank it or exchanged it..?

[cem_devecioglu]

if you are sure theres no ignition problem
try a compression test ..this may clear the picture..

but also I think you must have some codes stored..

Still have a code19 stored but have had that for ages, not sure it would cause misfire either. I get code 19 (incorrect rpm signal) with engine running and when not.

Code 19 Crank sensor  :-? must show other symptoms also.. :-/

[Iain]

Mine mis-fired badly on 1&2,Snap on reader came up with code for EGR
Change it and it fixed the problem,also believe the car is a lot more responsive now

[megaomega123]

I think I have narrowed this down now. I found that lead 4 was not fully connected at the DIS end. There has been some water ingress and the lead end was corroded along with the terminal on the DIS pack.
I cleaned up the lead which is now good but misfire still present but not as bad.
Will this be a new DIS pack or will cleaning of that one corroded terminal fix things?

[megaomega123]

Does anybody know the part number of my DIS pack? It is 2000 2.5V6 and it has the oval connection.
Like this one:
http://cgi.ebay.co.uk/VAUXHALL-COIL-PACK-90541062-OMEGA-2-5-3-0-V6-DIS-UNIT_W0QQitemZ160331864683QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item160331864683&_trksid=p3286.c0.m14&_trkparms=72%3A1683%7C66%3A2%7C65%3A12%7C39%3A1%7C240%3A1318%7C301%3A1%7C293%3A1%7C294%3A50

[megaomega123]

Anybody any ideas if this is the right DIS pack or a part number please? Need to change as soon as poss