can anyone help with this problem car has misfire when on boost at around 12 psi fine below this. all new parts leads arm dizzy cap gpa coil and phase sensor set to correct gapping and running pp8 plugs on standard gap what should this gap be?

 

Hi
Around 0.65mm or a little bigger if you can get away with it.

 

0.65 and use 071 plugs.

 

thanks mate i'l give that a try

 

well im on .5mm with 34 psi but you should be able to go higher as already stated

 

are these plugs motorcraft or what make mate?

 

sorry pal,im running c59's and she doesnt miss a beat idles a little lumpy but it has an uprated cam so to be expected i guess.anything more than .5mm its misses at around 20 psi

 

welcome to pf btw mate

 

thanks mate so there champion plugs need to get a set soon or would i be able to regap pp8 what do you think?

 

yeah you can gap any plug as long as you have feelers,i only use these plugs cos of my big boost there not the best plugs for day to day as they are racing plugs,regap them to .6 and see how it goes mate as long as they are good condition and rest of system is ok then you shoukd be fine at that

 

COSWORTHJOE

 

****edited by webteam to get link working****

 

tidy looking engine bay looks like its been looked after

 

the is a f reg and was rebuilt in 97 and converted to 4x4 so its mega clean all round loads of paperwork for it

cheers mate