Backfire After Service

[Mr. Oizo]

loud, bang/pop

when cruising, boosting what ever....

hmm

does the car hesitate at all when it happens? or is it running fine?

[JVP]

hmm

does the car hesitate at all when it happens? or is it running fine?

nope

it kinda feels shitty to drive....

but doesnt hesitate at all...

[psybic]

Sounds like your mechanic or someone is throwing alot of ideas at you to get you to lots of little things... good marketing strategy.

So your car is running a little rich. You need to lean it back a little, using an SAFC or aftermarket ecu.

You don't need a:

- Power Run on the dyno so they can go, yep... its rich. and adjust base timing... thats so dodgy.

- A new fuel pump, so they can go, yep... its still rich.

- A chip... who remapped it?

Your BOV has a thin hose coming off it to make it work. Thats not the hose they were asking about. Does it have an opening which lets the air out, or a big fat hose or pipe which runs back to the inlet? Does it go, pshh? Or is it completely silent.

It probably started after a service because they probably cleaned your air filter, or did you put a pod on there? Either way, as soon as you get more air, your stock ECU is going to go rich.

[JVP]

Sounds like your mechanic or someone is throwing alot of ideas at you to get you to lots of little things... good marketing strategy.

So your car is running a little rich. You need to lean it back a little, using an SAFC or aftermarket ecu.

You don't need a:

- Power Run on the dyno so they can go, yep... its rich. and adjust base timing... thats so dodgy.

- A new fuel pump, so they can go, yep... its still rich.

- A chip... who remapped it?

Your BOV has a thin hose coming off it to make it work. Thats not the hose they were asking about. Does it have an opening which lets the air out, or a big fat hose or pipe which runs back to the inlet? Does it go, pshh? Or is it completely silent.

It probably started after a service because they probably cleaned your air filter, or did you put a pod on there? Either way, as soon as you get more air, your stock ECU is going to go rich.

ok

got a fuel pump coz it was leaning out. still had original 1990 fuel pump. was next on mod list anyways.

re-map was done by dr.drift. so he knows what hes doing.

its a turbosmart bov, so it goes psshh. stock bov going back on too.

i had a pod on it. i now have the stock box in, but havnt driven it due to battery dying.

i had the chip and fuel pump put in coz the AFR's were at 14-15. very high.

its back down to 12 now.

can a faulty o2 sensor cause this?

power run was done so i could see what power i was making.

[Adriano]

I would close up the plug gaps to .8mm, then refit the standard bov. the car wasn't running lean because of the ecu, it was the fuel pump. Lean mixtures are easier to ignite, so by replacing the fuelpump you have made the miss worse. If the plugs dont fix it, check the coils. might not hurt to chech the cam and ignition timing.

[JVP]

I would close up the plug gaps to .8mm, then refit the standard bov. the car wasn't running lean because of the ecu, it was the fuel pump. Lean mixtures are easier to ignite, so by replacing the fuelpump you have made the miss worse. If the plugs dont fix it, check the coils. might not hurt to chech the cam and ignition timing.

ive had the plugs changed at the major service, and they were genuine nissan plugs which equal to the NGK equivalent.

timing was fixed by nissan, coz i took it back to them

went away, but has come back.

i didnt think it would be coils, becoz it seems to be an over-fueling issue...

but i dunno. not a mechanic....