R33 Missing

[HKS-R33]

Hey guys, currently got a problem with my r33 gtst.

It is missing when it is under load. If u rev it when the car is stationary it will not miss if you gradually build the revs up. But if you rev it once then go at it again before the revs come back down it will miss.

It misses when you are driving aswell if you start to put the foot into it. The car also blows out a puff of black smoke when it misses.

Its not the coil packs and its not my inlet piping (cant find a leak).

Has anyone got any ideas as to what it could be?

Im think maybe i should change my plugs anyway but im doubting it would be the problem.

Thanks, Mike.

[R33PWR]

Like you said check your plugs if thats not the problem look elsewhere. Is your car tuned ? What boost is it running.... Does it happen all the time... Is car warmed up or only happens before you get to operating temp.... So many variables..

[MKDR33]

might be an afm problem.. ive experienced similar problems with my afm unplugged..

[Guest 40th-edition]

Yeah, the AFM could also be full of gunk... check out the hotwire and give it a clean if so..

check plugs..

[sinistaGTR]

plugs i bet

[HKS-R33]

Hey guys, i changed the plugs today and it made no difference at all. My AFM is only like 6 months old and has been used stuff all so i dont think that it is that. Is it possible to be the o2 sensor?

Anyone else got any ideas?

Thanks, Mike

[Sumo]

Hey guys, i changed the plugs today and it made no difference at all. My AFM is only like 6 months old and has been used stuff all so i dont think that it is that. Is it possible to be the o2 sensor?

Anyone else got any ideas?

Thanks, Mike

02 Sensors only "Trim" your fuel mixture.

I would be inclinded to be looking at the Ignition system (black smoke indicating unburnt/rich fuel). But thats not to say its not an injector problem. Biggest thing is to test things when you can replicate the problem - hence the use of dyno's for diagnosis. Its one of those things - to the untrained eye you could spend a long time looking for it.

Cheers

Sumo

Edited October 1, 2006 by Sumo

[700HP-GTR33]

Are you 100% Sure it is not your coils.

When did this missing start?

[HKS-R33]

it started missing after i completed a whole heap of work. ive had stuffed coil packs before and i know the symptoms of them.

car should be going on the dyno sometime this week but i kinda wanted to get rid of the miss before the dyno.

Thanks, Mike

[HKS-R33]

hey guys do u think my problem could be my TPS?

[rob82]

hey guys do u think my problem could be my TPS?

No!!! 99.999999% of the time a missfire will be due to a bad plug (wrong heat range, incorect gap, cracked insulator) or a bad coil (cracked coil boots, foreign particles around plugs/boots and or excessive oil or the coil itself). Also overly retard ignition can casue missfires along with about a thousand other things - check the basics first always!!!!

Can somebody please do a missfire check list and wirte it into a sticky - I swear we see this post every week.

[InterCooL]

my brothers rb20det was misfiring

brought the gaps down to 0.8 and it fixed 99% of it

[FROGGAH]

I have similar problem my car falls into a very big hole at full throttle over 4000rpm. I did also have a misfire but a dodgey coil pack was the cause of that. i have exchanged igniter module with a new one still no luck my next step is AFM. if no luck im getting an aftermarket ecu and split fire coils and hope like hell it fixes itself

[MKDR33]

if u have stock coil packs try taping them up..

more info here --> http://www.skylinesaustralia.com/forums/in...119403&st=0

[The Dan]

if u have stock coil packs try taping them up..

more info here --> http://www.skylinesaustralia.com/forums/in...119403&st=0

bandaids work best for this.

[Shaneo]

i got a miss that is at any rpm and it isn't plugs or coilpacks... i know how you feel

[Rolls]

Does it matter if its cold or hot? What gap are your plugs? Try gapping down to .6 what makes you certain its not your coils? check the timing, maybe the cas is rooted?

Still running stock boost? what does your guage say its running?

[MKDR33]

bandaids work best for this.

ive heard the same thing too, as they are soft and cover the split nicely.. although the glue bond isnt as strong and they will shrink and slide off?

[godzl1975]

maybe get the injectors cleaned?

[HKS-R33]

hey guys 99% sure its not my plugs or coil packs. It misses at any RPM. Ive changed my plugs and gapped them at 26 thou.

Also my injectors are only a couple of months old and were working a few weeks ago, so they should be fine.

I will check the CAS and timing though.

Thanks, Mike