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[mark.adams]

When driving, i can feel the engine very occasionally misses, like a heartbeat, It has a new HG, breathers are clear, new genuine cam sensor. Any ideas/suggestions where is hould start looking for the cause of this.
It's a 4 pot DBW 2.2 the Z22XE engine

[kevpuk]

Leads/plugs ?
I found that knackered leads (mainly caused by leaking cam cover gasket....) caused my occasional miss...

[mark.adams]

New plugs, GM Ones, no leads, its a dis pack (ecotec engine)

[feeutfo]

New plugs, GM Ones, no leads, its a dis pack (ecotec engine)

would suggest pulling the coil pac check for cracks and check rubber boots for splits

would double ceck with a code reader for missfire codes before buying a new coil pac though. the boots can be replaced seperately im told.

[kevpuk]

New plugs, GM Ones, no leads, its a dis pack (ecotec engine)

Doesn't the pack connect to the plugs via leads ?  

[mark.adams]

New plugs, GM Ones, no leads, its a dis pack (ecotec engine)

Doesn't the pack connect to the plugs via leads ?  

No it has spring looking bits of metal inside rubber boots.
Incidentally if i do see misfire in the logs would it be prudent to change the coil pack after checking the rubber boots??

[vauxmad]

it will tell you which sensor is picking up or not picking up something as the case may be, go from there

[MutantCav]

maybe MAF?? As said check codes

[mark.adams]

http://www.omegaowners.com/forum/YaBB.pl?num=1238429958
Think we have a result here guys, damned EGR valve, going to give it a blast with oven cleaner.
Is it worth me taking photos of this or do we have that already done??

[Marks DTM Calib]

http://www.omegaowners.com/forum/YaBB.pl?num=1238429958
Think we have a result here guys, damned EGR valve, going to give it a blast with oven cleaner.
Is it worth me taking photos of this or do we have that already done??

Photos please!