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Backfire After Service

JVP

By JVP,
in Engines & Forced Induction

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JVP Grand Master

JVP

Posted
Posted

hey dudez

just had my major service completed the other day

i had replaced:

timing belt

water pump

cam seals

spark plugs

fuel filter

now when just cruising around, i change gears and the car backfires, not really loud but has never done it b4. when i really give it a boot and change gears it is quite loud. now i have the car booked in to get a dyno tune and was just wondering whether this will fix the problem. and the car has always been out of tune a bit so im hoping this will get rid of it. it has always backfired on decellaration too, which i wasnt worried about.

mods to the car are 3" turbo back exhaust, FMIC, pod, bov and boost to 12psi.

thanks for your help in advance guys

cheers

jabba

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JVP Grand Master

JVP

Posted
  • Author
Posted (edited)

i used nissan genuine plugs, they supplied them.

i just thought its wiered that i have replaced everything with new and now its doing it. never did it b4...

im not worried really but its rather annoying when u give it a boot, my car sounds sick.... :laugh: lol

thanks for your help dudez

its a turbosmart bov, so thats atmospheric yeh?

Edited by JVP-R32
JVP Grand Master

JVP

Posted
  • Author
Posted

yeh it has a silicone hose coming off the end

i think its a type 3...cant remember...

would a dyno tune help, im getting it done regardless, but when they fidle with the fuel and timing when they tune it, could this repair the problem? im getting an ecu chip done very soon also. when they replace the timing belts, does the tune go out of whack? sorry im a n00b at this.

thanks guys

d00dz Grand Master

d00dz

Posted
Posted

Its just running rich? ie. the R&R that normally occures with std ecu? 12PSI? on std turbo everyday? damm

My car backfired heaps when I did a few more mods to it and uped the boost. It would backfire every gear change, every downshift, I was even able to make it backfire on demand. Off throtle and on throtle etc..

Sometimes it would backfire by itself 4times in a row! "ZOOOM POP POP POOOP POP"

You shouldnt have anything to worry about, just means car uses more fuel, and the cat might be rooted lol

  • 3 weeks later...
JVP Grand Master

JVP

Posted
  • Author
Posted

car still back-firing, new fuel pump installed (bosch 040)

plugs were genuine nissan, which cross referenced to PFR6A-11, as recommended on here....

could it be the coils?

the pop is really loud, can feel it in the cabin lol

just need some help, its doing my head in.

cheers guys

Links Veteran

Links

Posted
Posted

When is it happening.. coming onto boost.. or when you back off boost..

Is it happening ALL the time, or only after you have been giving it a bit of a run..

If it's a) backing off boost & b) after you've been giving it a bit - the excess fuel is just being ignited as it hits the turbo/exhaust causing it to pop.. not really a huge issue..

Not sure why you'd get a "Dyno tune" when the car has the stock ECU.. unless you think there is something seriously wrong I don't see the point.. unless you want to see how rich your A/F ratios are going..

Not sure how a new fuel pump will help..

Hmm.. trying to think of what else it is.. more details on when it happens would be good..

  • 5 weeks later...

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