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Jason Thornton
TryHard
N.S.W
n/a

Posts: 103
Reg: 04-2007

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Thursday, August 14, 2008 - 08:02 am, by:  Jason Thornton (Jay9959) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi guys
Need some help with this misfiring ive read
a lot of post about this but mine is different
it will rev clean up to 4200rpm and then start to
brake down. Idle is great no misfire.

Dose it under load and with out load.

Im using NGK BKR5E spark plugs gap started at
0.7mm misfire started at 3500rpm so i gaped them
down to 0.5mm now im getting 4200rpm before
it starts to brake down.

I have also tried BKR7E's as well,same gaps as
well got same problem.

Both sets of plugs come out black like its not
sparking.
Or the spark is getting blown out can this be
stoped from happening.

I have checked coils all good.
Boost is 1bar running boost cut diodes,trim pot
set to 4.12 volts.

Could it be the ECU,igniter or bad earths do not
have spares to try. Igniter is not getting hot
slightly worm.

Any info would help
Shane McInnes
Goo Roo
NSW
JZZ30 GT-TL Manual

Posts: 1340
Reg: 07-2005

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Thursday, August 14, 2008 - 04:52 pm, by:  Shane McInnes (Soarin_tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Could be a blocked fuel filter?

still sounds to me that its your coil packs, it only takes a hair line crack to make it miss under load, i would be double checking them again.
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 3849
Reg: 03-2006

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Thursday, August 14, 2008 - 07:22 pm, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Try and get a set of good coils and swap em in to try... Make sure you run a minimum 6 heat range plug and move up to a 7 if making big power.. 6 heat range is recommended as a minimum!
Michael Keen
DieHard
nsw
Soarer TT

Posts: 785
Reg: 10-2007

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Thursday, August 14, 2008 - 07:40 pm, by:  Michael Keen (Spoilt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

i agree with daniel, i would run 6 heat range also were in nsw are, you because i know from experience if you live by the coast 7 heat range is fine, but if you live inland and maybe higher altiude then 6 heat range is the go.. cars run a treat up here :-)
Jason Thornton
TryHard
N.S.W
n/a

Posts: 104
Reg: 04-2007

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Thursday, August 14, 2008 - 08:25 pm, by:  Jason Thornton (Jay9959) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi Shane ye i check filter it's fine.
Ive check the coils every time ive changed
the gap on the plugs there ok too.

Hi Daniel and Michael ill get some 6's tomorrow
and put them if that fails,try and chase some
good second coil packs to try.

Cheers Jay
Cameron Laufer
TryHard
Queensland
JZZ30 GT TL

Posts: 275
Reg: 12-2007

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Thursday, August 14, 2008 - 09:02 pm, by:  Cameron Laufer (Ivboost) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Could also be Cam or Crank angle sensors, have you performed a Diagnostics check? also check Cam timing and TPS
Michael Keen
DieHard
nsw
Soarer TT

Posts: 787
Reg: 10-2007

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Thursday, August 14, 2008 - 09:47 pm, by:  Michael Keen (Spoilt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

hey jason where is nsw are you i got a spare set of coil you could borrow to try out if you need to? they not perfect but i pretty sure they work :-) 0438677965 as i wont be back online for a while
Karl Martin
Tinkerer
ACT
TT manual

Posts: 89
Reg: 01-2007

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Friday, August 15, 2008 - 08:40 am, by:  Karl Martin (Karl) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

I think theres a few guys on here with a fairly similar problem. There was a thread not long ago on it that may be worth a read as some of the guys listed what they've replaced etc what effect it had. Might save you some money and guesswork.

http://soarercentral.com/sc-forum/messages/51875/254931.html?1217223657
Jason Thornton
TryHard
N.S.W
n/a

Posts: 105
Reg: 04-2007

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Friday, August 15, 2008 - 02:34 pm, by:  Jason Thornton (Jay9959) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi Cameron not check them yet but there is a bit
of oil over both the cam sensors plugs though.



Hi Karl i have read through that one and taken
notes from them also.
Neil Griffiths
Goo Roo
NSW
I have a Cadillac and a Supercharged Manual V8

Posts: 4747
Reg: 07-2005

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Friday, August 15, 2008 - 05:29 pm, by:  Neil Griffiths (Aussiesc) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Cam Belt,
1 Tooth.
Jason Thornton
TryHard
N.S.W
n/a

Posts: 106
Reg: 04-2007

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Friday, August 15, 2008 - 07:37 pm, by:  Jason Thornton (Jay9959) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi Neil
Ill check timing belt over the week end.

Also found the earth to the body was not
grounded that well.

Cheers Jay
Jason Thornton
TryHard
N.S.W
n/a

Posts: 107
Reg: 04-2007

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Sunday, August 17, 2008 - 05:10 pm, by:  Jason Thornton (Jay9959) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Ok ive put BKR6E plugs in gap .7mm checked
and cleaned all the earths there was no earth
going to the head.

Took it for a normal drive let the rev's get
up to 4500rpm and there was only the retard
of the engine for when it was changing gear
so by the sounds of it could have been just
bad earths.

Cheers Jay
Jason Thornton
TryHard
N.S.W
n/a

Posts: 108
Reg: 04-2007

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Monday, August 18, 2008 - 07:44 pm, by:  Jason Thornton (Jay9959) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi guy's
Gave the car a bit today at WOT and only rev
to 3800rpm at 85kmh and 8psi.
The speed and rpm,boost would not rise at WOT got a lot popping though like the timing has
been retarded badly.

Reving up to this point boost is up to 15psi
then drops to 8psi once hit 3800rpm.When i back
off the throttle power comes back and boost's over
10psi once again.

Is it possible that it is hitting boost cut
even though ive got a boost cut set to 4.15volt.

Plug's NGK BKR6E .7mmgap.
Base fuel 36psi and at 15psi fuel is 60psi is
this too much fuel pressure at WOT.
James Harris
Goo Roo
QLD
XTR T-66 Turbo

Posts: 1793
Reg: 07-2005

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Monday, August 18, 2008 - 08:27 pm, by:  James Harris (Haro) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

OK...

can someone PLEASE tell me what "WOT" means... its been driving me crazy for a while now.

Sorry bout not havin an answer for your dramas.

Stinks of timing to me brother. Something sounds very bad there.
Gianni Matrogiannis
TryHard
nsw
SC400 V8

Posts: 214
Reg: 08-2005

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Monday, August 18, 2008 - 08:49 pm, by:  Gianni Matrogiannis (Gianni) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

WOT= wide open throttle.
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 3857
Reg: 03-2006

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Monday, August 18, 2008 - 10:15 pm, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

It should only have around 51-52psi of fuel pressure @ 15psi of boost with the stock regulator...

Have you tried a new set of coils? Or can you even borrow a set to make sure they are not it? What about trying an Ecu?

Where bouts in NSW are you? I might be able to help try some parts on the car.
Jason Thornton
TryHard
N.S.W
n/a

Posts: 109
Reg: 04-2007

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Tuesday, August 19, 2008 - 07:25 pm, by:  Jason Thornton (Jay9959) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi Daniel no have not had a chance yet to busy at
work.So coils could be worn out if no crack are
found.
Cut only had 46000km's on it.

Ecu was my first thought have located that just
need to send email.

Live in Wollongong.

Have been looking in to using after market ecu
and manual the auto, would be more
beneficial to run std management.

Revved it up in park when got home got to 4000rpm
and started to miss and that was easing the
throttle on.

Neil did say timing could be out one tooth
but when checked all timing marks lined up
also had #1 plug out for top dead centre.
Shane McInnes
Goo Roo
NSW
JZZ30 GT-TL Manual

Posts: 1350
Reg: 07-2005

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Tuesday, August 19, 2008 - 07:36 pm, by:  Shane McInnes (Soarin_tt) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

It really does sound like coil packs, exact same thing used to happen to me, did you check under the blue rubber seal/boots of the coil pack??? Like i said before it will only take 1 tiny hairline crack to cause that problem.

I could be totally wrong, but just sounds like the coil packs to me.

You can rule out fuel filter, timing, you have a stock ECU so i doubt its that and you could be hitting boost cut at 15psi because 14.7psi is the cut off, but it wont cause it to miss the way your describing, will just feel the car cut off in power then come back on again.
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 3862
Reg: 03-2006

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Tuesday, August 19, 2008 - 07:57 pm, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Mate get in touch with Jeff SMith on here.. He lives down your way and has new coil packs wchich you could try... I think he has an ECU also..

Worth a try mate!
Jason Thornton
TryHard
N.S.W
n/a

Posts: 110
Reg: 04-2007

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Tuesday, August 19, 2008 - 08:30 pm, by:  Jason Thornton (Jay9959) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

Hi Shane ye did check under the boots too even
went as far as putting het shrink over the stems
as well an part over the blue boot.
Ye just like the power is limited.

Hi Daniel ill send Jeff an email last time i
spoke to Jeff he said his only like around the
corner.

Thanks for the help guy's
Daniel Clarke
Goo Roo
NSW
TT 2.5L 6 cylinder

Posts: 3864
Reg: 03-2006

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Tuesday, August 19, 2008 - 08:57 pm, by:  Daniel Clarke (Dieseltrain) Quote hilighted text Edit Post Delete Post Print Post   View Post/Check IP (Moderator/Admin Only) Move Post (Moderator/Admin Only)

If you were near me, iw ould offer to help out, but you aint round the corner,lol!

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