32 Misfiring/ Hesitating

[Morgz32]

hey guys

tonight whilst driving my 32 i noticed that once it comes on boost it starts hesitating/ misfiring abit and a cloud of black smoke out the back. I put $20 of BP 98 in it before hand and thats when i started noticing it and thats the first time it happened, the night before i went on the Antilag cruise and again put fuel in before hand and it had no problems came on power fine and smooth.

the car has splitfire coil packs with standard BOSCH plugs, forward facing plenum with saard injectors and a 35R turbo with 44mm gate

im thinking it could be a bad batch of fuel?? possible coil pack?? and maybe the standard plugs have given up on life and thats causing the drama

it idles fine, drives fine with no misfire but as soon as it creeps up to about 4-4.5rpm as the power comes on thats when it starts to hesitate and misfire, sometimes its not bad then some other times its pretty bad any suggestions????

cheers

[ColdFusion]

Sounds like plugs or coils. When there is a lot of fuel/air going in it blows out the spark. Either gap is too large on the plugs or coils aren't making strong enough spark or spark is going somewhere else instead of to the plugs. If the gap is too large I.e. works ok with smaller gap plugs, then its likely the coils are getting old. Smaller gap is just a temp fix for the inevitable.

[Morgz32]

well i was gonna put new platinum plugs in and take it for a spin if no real change is there was gonna swap splitfires with my mrs's 32 and see if that makes a change then i can cross a few possible causes off my list

[turboedsloth]

Platinums are a waste of money, go get some bcpr6es for $5ea

[Morgz32]

well i had a set of platinums sitting around so i put them in and drove it the hesitation is gone but still has abit of a misfire i looked inside each coil pack when i changed plugs and cylinder 1 coil had a white powdery resedue and the little coil spring inside is like gone and all other coils are clean and have no pwdery stuff in it, and the top of the old plug was powdery and all crapped up, so i have a feeling its a combination of shit plugs which are failing when hot? and a crapped out cylinder one coil pack?

[Morgz32]

ok so i swapped a whole coil pack assembly for all 6 cylinders and the harness from my mrs's car to mine and took it for a spin, still the same result, like a popping, misfiring sound, doesnt really seem to miss i think i can rule out its a coilpack if mine runs the same with 2 different harnesses, i even swapped the dud looking one with the white shit in it to her car and took hers for a drive and hers ran nicely no miss or hesitation, im going down the lines that the pooping/ miss sound is maybe from the screamer pipe under abit of heavy acceleration??, it doesnt do it all the time when on boost just sometimes through the rev range, might even pay to get plugs with a .8mm gap??

[turboedsloth]

Change your ignitors over and try that also

[Nak]

agreed had the same problem with the gtr and it was the plugs. they were still standard gap size of 1.1 so i gapped them to 0.8 and swapped ignitor pack and runs perfect again

[Morgz32]

ok seeing as coil packs arnt the issue, ill get .8mm plugs and ill ring a wreckers and see if i can get my hands on a ignotir pack and see how we go

[Morgz32]

^{cant swap ignitor pack, i have a series 2 rb25 and the ignitor packs are built into the coil packs and ive swapped all of them and i still got the same result, maybe i need to get plugs with the right gap, whats weird is it ran fine before for ages then it started to play up, i swapped plugs with new platinums, it got alot better but not perfect}

[PIG_31]

also re-earth your main straps with emery paper and new goo

[Wogan]

crank angle sensor?

[marksuxass]

Black smoke? Sounds like AFM issue!