Missfirng New Car :s ?

[bazz]

i dont know if ud call whats happeneing to my car missfiring :S

in first gear u floor it, all seems fine (if a little laggish as boost never copmes on full :S) then once i hit about 4000-4500 i hear what seems to me as a loss of air (like a blow off valve kinda thing), then the car acts as if it hit the rev limited and falls back. i change to the next gear (3rd usually) this time the air noise is mopre obvious and the car does the same thing at 3000!!!!!.

if i drive the care bellow 3500 this porblem does occur BUT WHO DRIVES A SKYLINE BELLOW 3500!!!!!!

im stumped guys, were do u think the air leak could be (if that :S)??

Has any1 ever experienced this before????

appreciate the help cheers

Edited September 19, 2005 by bazz

[Links]

i know thjere are heaps of previous topics about this, but they all sound like my problem

in that case I suggest you use search..

Could be the coils are cracked.. what type of car.. how old.. more info

[bazz]

yeah the cars getting old its 94 series 1 turbo

i changed the afm witha mate, and put in new sparkies.. still nothing

with the coils, when u rev the car u hear a funny spool(excess air) and the car cuts out and miss fires,, i searched for an air leaked but didnt find 1 :s maybe im not looking hard enough :S

i took a brief look at the coils and theyre seemed to be some white powdery substance does that mean theyre fualty? should i go to a mechanic??

chers

[bazz]

checked the coils, no visable cracks or scortch marks :S

[SECURITY]

i had the same problem, its definately your coils. sand down the inside of your coils LIGHTLY with a dremil drill to a nice shine, make sure you get the whole inside of it and stretch the spring a LITTLE...

this area:

then tape up the usual parts.

[vexed]

yeah that could be right, it could also be ur injectors failing to supply enough fuel on the top end. im no expert but ive seen this happen and the car cant rev at high rpm, or get ut computer checked, cheers

[Links]

I would possibly suggest putting the car on a dyno and see what the A/F ratios are doing.. this should also help a mechanic diagnose what the issue could be

[bazz]

thanx for the advice guys, so far ive

1 changed the sparkies to 8mm gapped

2 changed the afm with a mate (the old one was working fine)

3 cleaned the coil packs with wd40 (they were pirtty clean with no signes of cracks and scortch marks

4 tightened all hoses from the intercooler

5 kicked the car

still nothing. i dont know if ud call whats happeneing to my car missfiring :S

in first gear u floor it, all seems fine (if a little laggish as boost never copmes on full :S) then once i hit about 4000-4500 i hear what seems to me as a loss of air (like a blow off valve kinda thing), then the car acts as if it hit the rev limited and falls back. i change to the next gear (3rd usually) this time the air noise is mopre obvious and the car does the same thing at 3000!!!!!.

if i drive the care bellow 3500 this porblem does occur BUT WHO DRIVES A SKYLINE BELLOW 3500!!!!!!

im thinking its some kind of air leak now, or a dead/faulty cpu :S

im stumped guys, were do u think the air leak could be?? has any1 ever experienced this before????

appreciate the help cheers

[skylinecouple]

Sounds like crack in rubber intercooler connectors at inner guard.Remove air box and actually take the connectors off the car to see just how little the crack could be to cause all your beautiful boost to escape.30 seconds with a boost gauge would show you if car is reaching full boost.