Another Miss Thread ... Bear With Me

[Tomek]

The car is stuttering/ popping sounding like a BEE-R limimter (toned down a bit) dumping fuel when building boost..

Pulled out the spark plugs and replaced them with NGK BKR-6E items, was told that these are pre-gapped at 0.8mm and should do the trick.. Car kept on missing, so sparkies weren't the problem.. Next I got another set of 32 GTR coil packs. Trialed them and still missing. I have a new coil loom due to arrive early next week, but somehow i don't really suspect the loom to be playing up. My current loom is worn and a couple of the clips are broken however the connection is there and it sits tight.

It's been missing on at least 3 different tanks of BP ultimate, the car drives fine until it gets to 4500rpm and over. I've looked at the intake set-up which seems fine. Tried turning down the boost

At this point Im somewhat stumpted.

Some people told me it could be injectors, but i don't see this to be the likely cause since it's dumping fuel and blowing black smoke so it's definately rich.

My next steps could be

-analyze the packs (1 of at a time)

-clean the afm's (question is with what and how?)

-Iridium plugs

-Ripping off front bar and analyzing the whole intake

-Split fire coils

I've got a whole bunch of parts sitting at home ie; turbos, fuel set-up, ebc, cam gears, injectors ... I was planning on getting it all done at home over a few weekends, but now im tempted to take it to my mechanics if a spark issue is causing so much drama for me, I cbf putting up with all the twists and turns of my first 26 turbo swap adventure.

Any suggestions?

Edited August 8, 2008 by Tomek

[R31Nismoid]

It wont be the plugs - iridi are a waste of money anyway

AFM's - DIY section has a "how to" on cleaning them

Coils - could still be a stuffed coil or the loom. Wait till the loom arrives IMO, and (if you can) swap coils with someone who does not have issues

And go from there really

[Tomek]

It wont be the plugs - iridi are a waste of money anyway

AFM's - DIY section has a "how to" on cleaning them

Coils - could still be a stuffed coil or the loom. Wait till the loom arrives IMO, and (if you can) swap coils with someone who does not have issues

And go from there really

Thanks for the head up mate..

Will clean the afm's today with brake cleaner, makes a lot of sense to me now.. I haven't cleaned the K & N pods in some 12,oookm's , so they must have passed through a lot of grime to the meters..

Will update my findings later today..

Edited August 9, 2008 by Tomek

[GeeTR]

Dodgy igniter? (cam cover mounted thing)

Does engine bay heat soak change its effect?

Edited August 9, 2008 by GeeTR

[Tomek]

Ok...

Just got back home after spending a good 10 hours on my car (and mates 32; putting turbo on the rb20)..

The afm's were rather dirty and I gave them a real good clean, with the pods I gave them a treatment to. While waiting for them to dry I loosened the silicone hoses in the engine bay pulled them off and put them back on..

Fitted it all back up and it was still missing, Anything more then 50% injector duty (stock injectors) and it would start missing. Got back home and checked the coilpacks one by one while engine was running.. They turned out fine. I then borrowed my friends coil distributor and fitted it to my car, it didn't yield any results.

Got some more suggestions from mates, was going to run a test on my FPR but decided not too due to in-sufficient tools..

On the way home I noticed the car would start missing (or should i call it stuttering now) as soon as the centre console boost gauge would start registering positive boost.

So atm I am 80% sure it is a boost leak..

Tomorrow Il rip off as much plumbing as accesibly possible and perhaps get new clamps, then during the week order some new silicone hoses..

Sounds like a boost leak right?

Edited August 9, 2008 by Tomek

[bombtrack]

Are you hearing any odd noise from the engine bay in addition to the exhaust backfires?

[godzl1975]

could be a dirty injector/s

[Tomek]

No I wouldn't say i heard any odd noises from the engine.. Apart from the popping which is giving away the boost leak idea.

It could be dirty injectors, but im not assed to pull them out and get them tested to knock them of the trouble shooting list. If i can't figure it out tomorrow il just drop it off to my mechanic and get him to band it and give me the true symptom.

Cheers Tomek

will update ...

[cuppas]

O2 sensor?

[Tomek]

O2 sensor?

havn't had a look at it yet..

On my way to get some new hoses, clamps and sand paper, removed the old one's. 1 of the hoses is pretty bad and 3 of the clamps are rooted ..

Pretty confident now

Edited August 10, 2008 by Tomek

[den001]

ecu.........

i had the same problem, trying to come onto boost, would missfire, shake, throw black smoke, and wouldnt come onto boost....

make sure the plug on the ecu is not bent into the actual computer, like the 10mm bolt that bolts it in, make sure the sides are equally pressed in aswell.....

Edited August 10, 2008 by den001

[RIKK GTR]

doesn't sound like a boost leak,

have you tried checking each cylinder?

remove each coil plug see amount of difference?

comp tests are always handy

[rhys5169]

does it do it in every gear? does it do it when you have a full tank i.e more than half?

[Tomek]

does it do it in every gear? does it do it when you have a full tank i.e more than half?

yes.

[Tomek]

doesn't sound like a boost leak,

have you tried checking each cylinder?

remove each coil plug see amount of difference?

comp tests are always handy

had a mini rip in one of the joiners which I have patched up (about to order new ones)

no I havn't done a comp test yet.

[Tomek]

Sunday I patched up the boost leak.

Car was still missing but now building boost and staining the driveway on idle (incredibly rich)

Talked to a mate and explaine the systems, and he found by freak of nature the likely cause.. Now for the people who are interested.. here is the read:

http://paulr33.skylinesaustralia.com/docs/...erfc-faq.htm#63

So after quite a long dilemma of finding the suitable earthing wire i finally put an extra earth on it... Car is still missing slightly but it is pulling through the Rev range some what cleanly.

Today I went to take my mech for a spin, after a quick 2nd gear blat, he told me to reduce the gap on sparkies..

So tomorrow I will be gapping down to 0.6mm () and tidying up the coils, which should result in a fix..

[rb26s13]

Sunday I patched up the boost leak.

Car was still missing but now building boost and staining the driveway on idle (incredibly rich)

Talked to a mate and explaine the systems, and he found by freak of nature the likely cause.. Now for the people who are interested.. here is the read:

http://paulr33.skylinesaustralia.com/docs/...erfc-faq.htm#63

So after quite a long dilemma of finding the suitable earthing wire i finally put an extra earth on it... Car is still missing slightly but it is pulling through the Rev range some what cleanly.

Today I went to take my mech for a spin, after a quick 2nd gear blat, he told me to reduce the gap on sparkies..

So tomorrow I will be gapping down to 0.6mm () and tidying up the coils, which should result in a fix..

should be no need for .6mm plug gap with your current setup.. if thats still the case your coil packs are on there way out the door.. .8mm gap shouldnt have any problems with your setup

and it wasnt by freak of nature.. it was by you not mentioning everything done to the car just like the first post in this thread

[Tomek]

should be no need for .6mm plug gap with your current setup.. if thats still the case your coil packs are on there way out the door.. .8mm gap shouldnt have any problems with your setup

and it wasnt by freak of nature.. it was by you not mentioning everything done to the car just like the first post in this thread

well plan is to modify the packs .. if this doesn't fix it.. Il re-gap..

Why can't you just agree... it was unlikely you would of gave me the info if the wording wasn't spot on

[rb26s13]

well plan is to modify the packs .. if this doesn't fix it.. Il re-gap..

Why can't you just agree... it was unlikely you would of gave me the info if the wording wasn't spot on

i believe it was "hang on.. wat bloody computer you running" "pfc" "ahh ffs you didnt tell me that"

we could get onto the subject of chicken wire?

[Tomek]

i believe it was "hang on.. wat bloody computer you running" "pfc" "ahh ffs you didnt tell me that"

we could get onto the subject of chicken wire?

.. don't make me strangle you with my coat hanger!