Back Fire / Loss In Revs Under Hard Exceleration?

[rhys5169]

ok so it was noticable tonight to post up on here, at around 4000rpm its almost like the car takes the accelerator off, cause i get a drop in revs and a back fire noise.

it only does it every now and then, but it shouldnt be doing it......

the car is stock, apart from 4inch hks dragger cat back exhaust, pod filter, super spark coil pack, nismo S-tune sparkplugs and supposedly a bigger fuel pump?

is it just a case of maybe running too rich? overflowing the car with fuel and choking it??? injectors? spark plugs? im new to the whole skyling thing so any advice much appreciated

if youy need any more info please let me know

cheers

rhys

[rhys5169]

***it feels like traction control for those who have felt that before, i go flying up to around 4k rpm, then it just kills the revs very similar to traction control

[Jack88]

i heard it tonite when you took off,did it in first but not in seccond??id just start with the basics like plugs first.have you checked the condition of them since you bought it?do you know what there gapped to?get a hold of some NGK copper plugs to chuck in here to see if that fixes the prob,there cheap and available from just about any where.

oh and it sure as hell didnt sound like traction control cutting in lol.sounded like you had a Bee R installed

[tridentt150v]

I'ts not knocking is it? Don't have an orange light flashing when you put the boot into it?

Otherwise its either air of fuel. I'd get your fuel flow and pressure tested, 10 minutes and say $50 at any reputable garage. At least that would eliminate fuel up to [but not including] the injectors.

[rhys5169]

no flashing lights, and no knocking i can hear from the drivers seat. im gonna drop into my mechanic tomorrow night and ask him a few questions, it does feel like a fuel issue....

jack, whats a bee R? yeh it did do it in first then i short shifted to 2nd and it was fine :s

[Adriano]

Im guessing AFM, do a diagnostic search on the ecu and see if there are any trouble codes

[rhys5169]

Im guessing AFM, do a diagnostic search on the ecu and see if there are any trouble codes

thanks for the reply but im relatively new to the skyline thing, so if you could describe how i could do that? or is it left for someone with a dyno?

cheers

rhys

[DAN00H]

Rhys

Get your base timing checked. has the timing belt been changed? could possibly be that it was not put back on correctly (i.e. is out by a tooth or two).

[Adriano]

It wont be either of those things. I think there is a tutorial in here on diagnostic searches. Its very easy to do at home.

[STATUS]

sounds like lean out.

[Beer Baron]

yep, I would look at failing fuel pump. or even fuel pump loose in tank. it's quite often very pronounced in 1st gear as you get rapid change in fuel requirement as it ramps onto boost, and the acceleration g's push all the fuel to the back of the tank too.

[rhys5169]

yep, I would look at failing fuel pump. or even fuel pump loose in tank. it's quite often very pronounced in 1st gear as you get rapid change in fuel requirement as it ramps onto boost, and the acceleration g's push all the fuel to the back of the tank too.

i think you may be right, i just taped up every coil to try that method, it has worked somewhat but now i am only getting it in 1st gear after 4000rpm when i seem to be turning??? it barely does it when going in a straight line in first....

so im leaning more towards a pump loose in the tank?? sound about right? whats my next step from here then?

cheers

rhys