I have a strange misfire in my car, a saff 2wd with 4x4 engine stage 1 with new spark plugs at 0.7mm
When i normal drive with the car there is no problem and when i realy go for it still no problem but after that i drive again normal and then around 2500 revs in 3rd +- 50 km/h it misfires but not all the time just sometimes, when he misfires then it doesn't matter in what gear i'm in.

It's difficult for me to realy good discribe the problem.

Cheers Ruud

 

its probably not it - but once i push mine to max boost it will overboost. then cuts in at low boost in any gear. does this sounds at all like yours?

 

is it when comeing on boost if so check plug leads had the same prob when going over 14 psi turned out to be shit leads

 

No, the boost is not coming in. When i drive at aprox. 2500 revs and i hold the gaspedal to that rev, then suddenly he misfires and i can see the rev counter dropping for 0.5 sec and then again a misfire and then it's over.
When i'm driving at 3000 revs no problem it's just between the 2000 and 3000 revs with no boost.
Sometimes 2 days no problem then suddenly he misfires for two or 3 times en that's it no more misfires.
It's very strange and he only does it when i'm driving ,when the gear in neutral en then at 2500 revs there's no problem just under load he misfires.

Cheers Ruud

 

Think off the top of my head the recoomended gap size is .65mm, worth a try.

 

I had a very similar problem and it turned out to be a dodgy dizzy cap. I had tried all the usual stuff and then thought sod it, may aswell try the dizzy cap and it cured it!

 

Thanks m8 i will try this

Cheers