Still Missing - HELP

[46n2]

Hi all,

I have posted regarding this before, but now it seems worse...

I took my 32 to the mechanics a while back to have a look at the car missing... Engine-wise, my 32 is basically stock bar a pod filter. Cylinder 6 was missing. We changed the plugs, checked the coil packs, & cleaned & tested the injectors.

All of this came up OK. Compression test time. Also OK. The only conclusion the mechanic could draw was a blown head gasket.

The head gasket theory is now out the window also. Slip and I replaced the head gasket and it's still missing. No change at all (except for the smoke off the ehaust manifold which is most likely to be WD40 burning off ).

Can anyone - anyone - please help. I'm open to suggestions no matter how stupid they may seem...

Michael

[fatz]

ecu

sheck the error codes

injectors

[R31_GTSX]

air flow meter?

[KamikazeR33]

broken rod?

maybe something broke inside.. not sure how if its not boosted... but u neva know

[R31man]

You have probably checked these already but have you tried plug leads?

R31man

[Roy]

Can i ask how you know it was cylinder 6 thats missing

[adam 32]

what were the figures you got from the compression test?

[CMS Drifter]

a friend of mine has a Z32tt and it is missing, he took it to nissan and they said it was a stuffed knock sensor.

if it seems to be running rich and short on power as well as missing, it probly is the knock sensor, get it checked out.

[46n2]

Thanks for the mass of responses...

Fatz: Thanks, I'll check the ECU Codes tonight and post back results. Injectors were cleaned & tested a few months ago and all was OK.

R31_GTSX : Airflow meter? :confused: what to check?

R31Man: Plug leads? Do you mean the injector plugs?

Roy : I took it to the mechanic when it was first missing and we pulled everything off exposing the coil packs, and reconnected everything that needed to be. Started the car, and pulled the cables off the coil packs 1 by 1 until it sounded no different. We drew the conclusion that it was # 6.

Adam : Not sure of the figures from the compression test, but I might go and have it re-tested

CMS Drifter : That sounds similar to the way it's running (200-250klms per tank around city, booting it only part of the time).

Where can I take the knock sensor to get it checked out in Brissy?

Cheers,

Michael

[adam 32]

make sure you get the exact figures, that will tell you if its a problem inside one of the cylinders whether it be head or bottom end. if they are all holding compression then its an electrical/ignition problem and theres a whole list of things that need to be checked. even check the exhaust cam timing, if its been retarded too far it will miss (you would have re-aligned this when putting the head back on)

[46n2]

ADAM: Yeah, I think it's going to be worth the trip to a mechanic's to get a comp. test. I'll find out & post results. I don't think it is a new problem (re: exh. cam timing) as it sounds no different to how it sounded before - but at this point I'm willing to check anything :crazy:

KAMIKAZE : Sorry, I missed you i the last post. If it was a broken rod, would I be hearing all sorts of crook noises? (I can't?)

Cheers,

Michael

[adam 32]

if its something busted on the inside ie 1 cylinder has dropped out youd be blowing smoke everywhere and its be breathing through the breather pipes on top of the rocker covers

do you have any of these symptoms? also oil pressure would be low and water temp high

it may be a knock sensor - causing ECU to retard timing.

have you tried replacing coil packs, ignition module, spark plug?

what do the spark plugs look like? is cylinder 6 blackened? ie is it not firing at all?

[46n2]

Adam,

Not blowing smoke, coil packs have been tested, plugs replaced (5000 klms ago, plugs looked OK when the head was off)...Stupid question....Ignition module?? It doesn't sound like a constant misfire...I think it's going some of the time (the splurt & splutter isn't constant )

Michael

[adam 32]

maybe try swapping over the ignition module, its the little silver box which amplifies the current supplies to the coils... its at the back of the rocker cover

did you get my PM?

[46n2]

Hey Guys,

I ran an ECU Diagnostic last night and it came up with 55 after 55 after 55 - All OK. I didn't wait out the entire 50 prior errors codes, but 20 - 25 55's in a row seemed OK to me.

I think it might be overfuelling. From idle (1000RPM) applying light pressure to the throttle (what should be enough to take it to 1500RPM) it struggles, and sounds like its running even lower rpm, until enough throttle is given to take it just over 2000RPM. A similar thing also happens when gradually backing off the throttle. When backing off the throttle gradually (slowly and easily), when it hits 2000RPM it drops off completely (as if shutting down for half a second) back to 900 - 1000RPM, then back up to 1200RPM.

Thanks Adam. Yes I got your PM, I flicked you an email, but I'll copy it and send you a PM if u need me to.

Before I race off and but one, does anyone in Brisbane (I live near Toombul) have a healthy ignition module that I could run in my 32 for a few minutes as a test to see if it fixes my problem? Haze perhaps?

Thanks

Michael

[CMS Drifter]

You can get your knock sensor checked at your local nissan dealer. Might be an idea to get your oxygen sensor checked while you are at it.

I wouldn't worry too much about compression testing, I think you are wasting your time. You would know if you were down on compression, and it would be causing more problems than what you describe.

[sLo-32]

Hi 46n2.

Try changing the plugs to kind that dont petrude out ( if you know what i mean). I couldnt find the plug code on the ngk site but here goes. I believe with a standard'ish plug the spark actually petrudes out from the end of the plug. I just recently changed them to the non petruding v style plug and no more misfires. It may sound like an overly simple solution but it worked for me and i was quite suprised it did. I was told that the reason this fixed the problem was because the spark was too exposed and getting blown out with the petruding plugs. I'm not too sure whether this is correct or not cause im not sure whether spark can be blown out

Anywayz

hope it helped

sLo

[46n2]

Thanks guys...

I'll have to leave work early to take it to Nissan and get it checked out. Is it a difficult thing to have tested - time consuming??? Will running the O2 sensor diagnostics tell me anything? - does anyone have error codes...do the O2 Sensor Diagnostics even spit out error codes?

I don't think that the plugs are the problem, though. If it was missing when boosted I would definitely pick that as the culprit, but sadly it misses most of the time when at idle to begin with. My plugs have been regapped to 0.8mm and are only 6 mths old.

Thanks,

Michael

[Zahos]

Try looking at this thread as well.

[46n2]

Thanks Zahos, I'll give it a go once I have all 6 firing happily...

This weekend I should be able to borrow an ignition module for a few minutes to see if that's the problem. *Fingers crossed*