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[psnimv6]

hello have started to get a slight mis fire out of my 01 mv6 it only happens on very light throttle and when you nail it it goes as normal, last week i changed the plugs and checked the plug wells they are bone dry and the leads look as new no eml on and never has ( other than when starting engine) the car has only 42000 miles on it and it is serviced every 5000 miles , so where do i look next any ideas would be apprecaited thanks in advance

[JamesV6CDX]

I wonder if there's an EGR issue?

Failing that, a dodgey coil pack? Is there any missfire under engine load?

[psnimv6]

it is misfiring only on light throttle and i think it is misfiring when in neutral at 1000-2500 revs but only very slightly the car is up for mot in the new year and a misfire will almost certainly fail the emissions and also is not good for the cats so it needs fixed asap but it is not a easily noticed when driving

[biker]

I would go with coil pack your symptoms were exactly the same as mine on my v6.

[psnimv6]

thanks for the replys but is there anything else to look at before i hand over my hard earned cash what about the suggested EGR how would i check if this is the problem or not

[Kevin Wood]

You could try blanking off the EGR valve with a metal plate under it and see if that improves matters, or clean it out.

Kevin

[psnimv6]

also i have noticed that the car does hunt a little bit on idle if that helps any, any more suggestions much appreciated

[TheBoy]

also i have noticed that the car does hunt a little bit on idle if that helps any, any more suggestions much appreciated

I would be inclined to block egr with a bit of coke can, if that doesn't help, look for possible air leaks...

[psnimv6]

thanks for the advice will do that and see what happens and will post back the out come

[psnimv6]

ok blocked off EGR but still missing also looked for any air leaks but so far can find no sign of any ( removed the wiper panel off for a better view) but every thing looks ok any more ideas, tried to look as dispack but it is a real b*t*h to even see as you all know all to well as for removal  

[Marks DTM Calib]

Start with the obvious stuff first....make sure the spark plugs are correctly torqued down and that there are no vac leaks.

Also chack the leads.

[psnimv6]

new plugs fitted last week and did,t help so that rules them out as for the leads they all look as good as new, as for air leaks have listened and had a good look but as yet everything looks as it should is there any vacum pipes that are likely culprits that are not easily spotted from just looking?

[bigdods]

Same symptoms as I had a few weeks back. Turned out water had got into the dis pack and corroded two of the terminals and the HT lead ends as well. Looking at the state of it I cant fathom how the thing ever ran at all but until it started major misfire the only symptom was a variable tickover. New dis pack and leads and shes running very sweetly now, no tickover problems no misfires and the power I didnt know i was missing has returned.

It is a pain getting to the dis pack and cables but it sounds most likely - but you may be lucky if its only a slight misfire might just be corrosion where some water has got in to one of the connectors you may be able to clean it out ( I am not a mechanic so someone will probably come along and tell you why this isnt a good idea). I initially thought mine would clean up but it was just too far gone. But then my misfire was 2 cylinders at anything under about 3k revs so it was undriveable

[psnimv6]

this is a old post but my omega is still misfiring i took a real good look today and removed all the plug leads and checked the dis pack for any corrosion or signs of damp but there is not any they look as good as new and took a real good look for any air leaks and the only one i found was a pipe that goes from the heater matrix to the pollen filter ( broken of at the pollen filter end ) i don,t think this will be any thing to do will the misfire and will be a real pain to repair, what is this pipe for and what effect will it have on my car i would prosume the climate control, anybody think of any thing i have missed to do will the misfire or this vacum pipe ( by the way it seems to be sucking air if this helps )

[Entwood]

Try blocking that pipe with a suitable sized bolt and jubilee clip, making sure you are past the broken bit ... see if it fixes the problem. This is an old fashioned way of tracing vac leaks but it still works