back fire problem

[ozyprd]

hey guys a mate has a problem with his car it is missing then fine under normal driving conditions but under heavy aceliration it backfires and spits and all that sort of thing i have been told ot could be fuel presure regulator

(i have replaced coil pack,plugs,leads,fuel filter,and fuel pump)

[Dyson]

Did the backfiring do any damage to the airbox? If it has a hole in it from the backfiring that will cause it to continue.

[ozyprd]

do u mean the airbox as in where the airfilter is?

[Dyson]

Yeah mate. When mine was backfiring it blew a hole in it.

[delcowizzid]

mine does this with one dfi and coil set i have as soon as i put my other one back on its fine maybe the new dfi and coils were dead

[ozyprd]

sorry i get the coil bit but wat does dfi stand for but the problem started b4 we changed them

[Tim Smtih]

Wouldn't be an issue with the emissions control system by any chance would it? If my memory serves me i heard that excessive idling or high revs can cause fuel vapour build up in the catalytic converter and may cause a backfire.

[Afterlight]

I had the same problem after i washed my engine (Duuhh) got new coilpacks and dfi module but it still did it, couldn't for th life of me work it out....turned out to be dfi/coilpackes wrnt grounding propley. tightened it up and voila....

/Drunkpost

[ozyprd]

sorry can some one tell me wat dfi stands for i get acronyms but it is going over my head but the coil pack is good

[strgas]

direct fire ignition module

[delcowizzid]

its the thin black module thats is under the coils