Back Fire Issues

[Alexxs]

Back fire issues when pressing 5,500 + RPM

any suggestions?

also looses a bit of power when backfiring.

Edited July 6, 2009 by Alexxs

[Alexxs]

sorry..

the mods done to the car are..

side mount inter cooler *adding fmic soon*, pod filter with a new AFM, inch dump pimpe, 3 inch exhaust.

[premium]

If its backfiring check the following:

- Bad engine timinig

- low fuel pressure, weak fuel pump or clogged fuel filter

- blocked catalytic converter

[Evil]

could be your coil packs failing...

[Alexxs]

actually was doing some test's on the free way last night

if i boot it it will stick @ 4.5 - 5k rpm.

if i ease it into the throttle it will go all the way to 8k without any problems at all..

im thinking fuel pump?

[buckets]

actually was doing some test's on the free way last night

if i boot it it will stick @ 4.5 - 5k rpm.

if i ease it into the throttle it will go all the way to 8k without any problems at all..

im thinking fuel pump?

im thinking your coil packs are arching out.

is it a backfire or a boost miss?

backfire is where the engine has two much fuel put into it and it expels it in one burst out your exhaust.

could be caused by:

1. bad fuel

2. shit in the bottom of your tank if you had low amount of petrol

3. running too rich

but im leaning more towards checking your coil packs

[nicr4wks]

I'm having the exact same trouble on my 33 gtst at the same revs, 3inch exhaust is the only mod. Replaced sparks with new standard coppers which seemed to clean it up a bit but soon after the problem was back, most of the time it's worse when the car has warmed up. Been thinking about getting some of those hks iridium plugs that can withstand more heat but at 19 bucks each it would be nice to know before hand if it's gonna help. Maybe check the gaps on your current plugs to make sure they haven't blown out and are in ok condition?

It's sort of a rapid "pop pop pop pop" coming from the exhaust like unburnt fuel is being dropped in to it, engine hesitates badly which causes the whole car to shake around a bit.

[buckets]

I'm having the exact same trouble on my 33 gtst at the same revs, 3inch exhaust is the only mod. Replaced sparks with new standard coppers which seemed to clean it up a bit but soon after the problem was back, most of the time it's worse when the car has warmed up. Been thinking about getting some of those hks iridium plugs that can withstand more heat but at 19 bucks each it would be nice to know before hand if it's gonna help. Maybe check the gaps on your current plugs to make sure they haven't blown out and are in ok condition?

It's sort of a rapid "pop pop pop pop" coming from the exhaust like unburnt fuel is being dropped in to it, engine hesitates badly which causes the whole car to shake around a bit.

yeah, one thing to do would be to get a mate to drive from behind in your case and watch while it happens for smoke out the exhaust.

in your case but nicrwks, yours sound more along the lines of a boost missfire.

couple of things:

1: what rpm is this happening at?

2: what fuel is in your car?

3: how much boost you running?

[wayde]

take out the coil packs and wrap the top half of them in electrical tape

i had the same problem and this fixed it immediately.

[nicr4wks]

couple of things: 

1: what rpm is this happening at?

2: what fuel is in your car?

3: how much boost you running?

1. Starts at 4.5-5k rpm right through to redline

2. bp ultimate

3. 7psi (no 2 stage)

Current sparks are NGK BKR6E

Alexxs: do you get the same popping sound around this rpm?

Edited July 9, 2009 by nicr4wks

[Evil]

sounds just like the problem i had with my coil packs... wrapped em in electrical tape to get a little more life out of em...

[Alexxs]

yeah my issues start at about 5k rpm, its not a boost leak, ive checked that out..

im going to replace the fuel pump tomorrow, (tried today and fuel tank as full DURRR WHU?!?! im a retard lol)

and doing sparkies tomorrow along with taping up the coil packs i guess.

car hasn't been boosted stock 7psi

its frustrating sigh

*edit*

im about 1/3 of my way through a tank of 98 with some injectors clears in it.

always run 98, vpower or bp ultimate.

Edited July 11, 2009 by Alexxs

[PsYLoR]

Coilpacks. check em for cracks with a microscope. thats more than likely the problem, if you get an improvement from tapping them up, then go buy new one's.

[wayde]

if everything else is due for changing then do it but otherwise seriously dont worry just tape the coil packs up until you can afford some new ones thats what the problem is

[wayde]

if everything else is due for changing then do it but otherwise seriously dont worry just tape the coil packs up until you can afford some new ones thats what the problem is

[Alexxs]

does it matter than it can rev out to 7k when on half to 3/4 throttle?

but only hesitates around 5k when under full throttle?

Edited July 17, 2009 by Alexxs

[Alexxs]

For any of you who are interested, the issue was...

wait for it..

waitttt for itttt

cracked inter cooler.

thanks for all Ur love and support people who left comments and feed back, much appreciated.

[bin]

Sorry for hijacking the thread. I've got back firing issues as well.

Mods:

Yellow Jacket Coil Packs

Plugs gapped to 0.8mm

3inch turbo back exhaust

Pod Filter

FMIC

I'm also still running the standard factory solenoid. Somehow when I'm flooring the throttle, I get up to 10-11psi of boost.

Anwyay, when I'm in 1st or 2nd gear and I back of the throttle at about 5000-6000rpm, I can hear back firing. There's no smoke coming from the exhaust.

Can anyone diagonse this?

[Alexxs]

Sorry for hijacking the thread. I've got back firing issues as well.

Mods:

Yellow Jacket Coil Packs

Plugs gapped to 0.8mm

3inch turbo back exhaust

Pod Filter

FMIC

I'm also still running the standard factory solenoid. Somehow when I'm flooring the throttle, I get up to 10-11psi of boost.

Anwyay, when I'm in 1st or 2nd gear and I back of the throttle at about 5000-6000rpm, I can hear back firing. There's no smoke coming from the exhaust.

Can anyone diagonse this?

if it only happens when u back off the throttle id say ur running rich. really rich or ur fuel pump / injectors need a clean / replace.

[LORDS89]

hey everyone.. ive got a bit of a smiler problem but 10 times worse to the point that its not drivable

about 3 days ago had my car parked outside a mates house.. and it was hell stormy weather.. anywayz i went to start the car it started then stalled.. so then i tried again this time it stayed on. but then as i went to drive off it stalled again. i noticed that every time i pressed the accelerator heaps of black smoke came out the exhaust which i know means its running rich.. but this wasnt just the usual lil bit of black smoke it was to the point where u could smell fuel and yor eyes would burn.. this obviously means that theres heaps of fuel that isnt getting burnt.

anyways i managed to get the car home and i took the coil packs out to look at them and there was water where the spark plugs are (decent amount). i drained it all out.. dryed the coils and put it back together started the car and its still doing the same thing. then i took the spark plugs out them and found that 3 of them were wet from the fuel.

this is obviously an ignition problem any ideas how i can narrow it down to wot part of the ingition system is stuffed? whats the best way to check the coils and the lil modual that sits on top of the plastic cover on at the back end of the engine etc??

help please!!!!!