Backfiring Since Intercooler Install

[Aif]

hay i got my 600x300 cooler installed yesterday, and since then when every i hit boost it sounds like its hitting the rev limiter. i have to take the car back to the shop but wanted to have a few ideas of wat it may be before i go there.

thank u

[WogsRus]

what boost are you running, it might be hitting boost cut. or the spark plug gap is to big. Need some more details

[Aif]

it was running stock boost before the cooler was installed but have noticed that the boost was higher since the install, can FMIC cause boost spiking? and i hope it isnt the plugs coz i got a set of platinums the last month.

so if it is hitting the boost limiter how do i fix it?

[WogsRus]

well not actally have heard the car, if the pug gap is to big, ie the stock 1.1mm and the coild are a bit week, the denser air causes the coil to work harder and you get a brake down of spark. This happend to me, i had to go all the way down to 0.6mm just to idle, and .55mm to run.

The problem is you can't regam platnums to easily, or arn't suppose to. go out and buy a copper set, the shop will know which ones, and buy the ones that are gapped to 0.8mm. Put these in and see how it goes. It is most propably the spar.

If it is hitting R&R, which i unliky, if you are running stock boost, then you may need an SAFC II air flow computer or a full computer to fix it. The ecu detect that there is to much air comming into the engine, and retards the ignitions and hence limits the boost.

Hope that helps

[Aif]

it seems to be idling fine, and it doesnt happen when i rev the motor when parked, will try the plugs with a diffrent spacing.

TY

[WogsRus]

the plugs will only break down under load, my coils were REALY BAD, and i mean bad. Most people experiance some sourght of brake down in spark eventually.

[Gazee]

Hey dude i had the same problem aswell on cold nights, probably have a look at your coil packs cos its a common thing to have hairline cracks in em causing the missfire when the rpm is around 4.5k - 5k, theres a few topics here on how to do a quick fix on em which suprisingly helps! And the gap on the plugs i've noticed alot of people gap em down to .8..

[Kennedy]

Plugs/Coils or both.

[Aif]

i took it back to the exhaust shop and they found a vacum hose that had melted shut and problem seems to have gone, i still wonna take it to a dyno to check a/f ratios and get it tuned.