after rebuilding the engine on the cossie it all seems fine till it starts to boost and then it pops and backfires and cuts out and will re start again no problems drives fine off boost just getting some ideas in so i can get a look at it if it ever stops raining

 

try the plugs mate
it can blow out the spark on boost if it dont have the right plug or gap

 

Have you got all plugs plugged in correctly?

Timed up correctly?

I once had similar problem, and IIRC I had my CPS and dizzy plug or maybe MAP sensor or similar plugged in back to front - can't remember exactly what I had plugged where, but car drove mint off boost, then popped and banged on boost.

Swap plugs so they are right and it worked sweet

 

[QUOTE=SiB;3407833]Have you got all plugs plugged in correctly?

Timed up correctly?

I once had similar problem, and IIRC I had my CPS and dizzy plug or maybe MAP sensor or similar plugged in back to front - can't remember exactly what I had plugged where, but car drove mint off boost, then popped and banged on boost.

Swap plugs so they are right and it worked sweet [/QUOTE


my dizzy plug wires were damaged and i re solderded them tohether could they be the wrong way round

 

[quote=saph4be;3407844]Could be, but you would need someone clever with electric stuff like Stu, Dingy or Ryan to help you diagnose that.

I guess there is a way to test it, but I wouldn't know as I'm not as clever as the above names!

Si

 

could also be something as simple as a bad main earth too

 

I have problems before with my dizzy and phase sensor, replaced both and misfire was sorted.


Misfire is back again, but this time on mine it is the multiplugs.

 

timing or map sensor