Bad Missfire & Knocking

[Akis]

Hi there!

I have a very strange problem!

I installed a Hypergear ATRG3 Turbo to my ER34 GTT, and from that moment the car stalls all the time..

Also went for a tune yesterday and the car was missfiring from 4000rpm till 6000rpm and then it knocks very HIGH

Like 116!!! That happened twice... So we stopped..

I have Apexi Power FC, Sard 800cc injectors, Sard FPR, Q45 Airflow, Stock elbow, 4" downpipe and back exhaust, 044 Bosch intank, OEM Coils(with electrical tape around them), HKS Iridium plugs(also changed them to Denso IK27), The car was working absolutely fine, before the turbo, injectors and Q45.

Akis.

Edited December 2, 2009 by Akis

[666DAN]

Have you checked the vacuum lines going to both the fuel pressure regulator, and the turbo pressure sensor mounted to the centre of the firewall are OK?

[Akis]

I've replaced all the vacuum lines with new ones before the tune(because i thought the idle problem was something leaking)..

The afr's are great and they are not flactuating(when missfiring and knocking) and that is very strange..

[Akis]

Anybody??

[Akis]

Bump...

[MBS206]

Coil packs.

Replace them, missing should go away, and miss firign can read as high knock

[boostn0199]

Id say its your coilpacks that electrical tape might fix them for when running low boost but when you start putting boost in theyll missfire again thats what happened to me so I just put in spitfires with ngk bcp7es spark plugs

[paulr33]

youve changed so many items all at once, it could be any of those

to eliminate the afm, can you go back the std AFM and see if it idles and runs normally with stock AFM

obviously dont load it up, just idle and plod around

if it works, then new AFM is either set wrong, mangled, damaged, wrong AFM or mangled wiring

if it doesnt work (ie problem still present) then youve eliminated the AFM being the cause

i would look at injectors and how they are setup

[FOOLBOOST]

Sounds like coil packs, replace them, they tend to miss on higher boost if they are on the way out and will only get worse.

Missing or hitting the rev limiter causes the power fc to read high knock so should be an easy fix

[paulr33]

if the coilpacks are toast, they would have been toast on the standard turbo as well, and it wouldn't make it not idle

[FOOLBOOST]

Ok stand corrected didnt see the stalling issues, def the q45 afm or injector latency check it

Edited December 5, 2009 by FOOLBOOST

[MBS206]

if the coilpacks are toast, they would have been toast on the standard turbo as well, and it wouldn't make it not idle

No, but my car also used to stall all the time before it was tuned with Sard 880CC injectors in them...

[Akis]

It was stalling after i replaced the turbo only(before the AFM and injectors..)

The injectors are set correct, also the AFM is correct..

I taped the coils but i do not know if it is correct, i taped them from the plugs and below the place the screws are..

Should i tape them all the way up?

Also when the turbo was installed one ground(from manifold to chassis) was cut BUT not replaced, could this be THAT bad??

Edited December 5, 2009 by Akis

[FOOLBOOST]

Best thing to do is remove the coil packs and coat them in high temp silicon, that will fix them if thats the problem, dont think the earth wire matters at all.

[Akis]

I will get them coated.

But the thing is that the time i only replaced the turbo(nothing else) started to stall..

And that is before the AFM and the injectors..

[talky]

wots this coilpack tape thing you guys are doing ????????

[MBS206]

Replace the earth!

There's a reason people do earthing kits!

[Akis]

Ok i will replace the earth and see how it goes..

[Akis]

So i tried the earth and nothing happened..

But as i was driving, i narrowed the problem, and it happens when the boost goes to 1.1 bar and on..

So i guess it is the coilpacks..?

[rasonline]

coilpacks are a devil of a problem.. that and the ignitor..

it may seem to be running fine, and then you change somethign which doesn't even remotely seem to be related to the coilpacks or ignitor, but they start giving problems.. best yo uchange them and give it a shot..good luck