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Help! Car Backfires Like Crazy On Boost

usmair

By usmair,
in Engines & Forced Induction

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usmair Mentor

usmair

Posted
Posted

ok, finally finished putting the intercooler on yesterday... took it out for a test drive... gave it a hit and as soon as the boost comes on around 5000 RPM the car just starts backfiring (atleast it sounds like backfiring) and it doesnt even move past the revs... the boost has gone up cuz of the fmic but im not sure how much because I dont have a boost guage put in yet...

this problem still occured before i put the fmic on but it was no way near as bad as now... it used to mainly do it in 2nd gear when i put my foot down... but still used to hit redline eventually (while backfiring between 5000 to Redline)...

my mate told me to change my sparkplugs which i did while i had the car apart for the fmic... but i only changed 4 out of 6 cuz i snapped 2 of them while putting them on... could that be it?

or do you think its fuel... maybe injectors? ive got no idea to be honest... complete noob on this sorta stuff

the car drives fine if you dont punch it... if you slowly take it to redline it will go there no problem... no backfiring at all... but if you give it a hit it just stops going past 5000 and starts backfiring like crazy

HELP PLEASE

oh btw who knows any decent shops in western sydney (blacktown area) where i can go to get them to look at it...

tridentt150v Grand Master

tridentt150v

Posted
Posted

Sounds like spark issues, maybe gap your plugs down to say 0.8mm....but your tune is not coping with the extra boost provided by the fmic. Just make sure your not getting det, cos you will destroy that motor.

You need a tuner, buy a magazine and look for ads...........

usmair Mentor

usmair

Posted
  • Author
Posted

dont worry guys i fixed it...

turned out i had to tpiece a pipe and run it to another pipe that was hooked up to the old intercooler piping...

blardi japanese instructions... had to guess everything lol..

thanks anyways...

usmair Mentor

usmair

Posted
  • Author
Posted

no boost controller yet... profec b going in about a fortnight... stock ecu... standard boost... stock boost guage doesnt show it going past 6psi..

pretty sure it is running rich...

but changing the spark plugs did make a slight difference..

lighty01 Collaborator

lighty01

Posted
Posted
no boost controller yet... profec b going in about a fortnight... stock ecu... standard boost... stock boost guage doesnt show it going past 6psi..

pretty sure it is running rich...

but changing the spark plugs did make a slight difference..

stock boost guage dont show psi buddy..

my guess is u were hitting past 12psi.

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