Missfire

[Funz]

ok, wondering if anyone has any thoughts..

took my car to a mates place to test an ignitor pack he had.. his didn't work so we put mine back on and now i have a permanent miss, and its an 'oh my god id rather be driving the magna right now' kinda miss..

Multimeter tested the loom and that was fine, have replaced ignitor pack, coils and spark plugs and miss is still there big time..

any thoughts?

did the old unplug each coil one by one but none made any noticeable difference...

am stumped..

[Az_StrYdeR]

What sort of gap are you running on your plugs mate?

[Mr. Untouchable]

What AFM are you running? double check wiring make sure connections are 100% and i'd be trying a different afm.

if its doing it at idle its not going to be a strane thing, so rule out coil packs.

maybe injectors. Did you get them cleaned and flow tested? should be checked for leakage and or large flow rate differances.

injector loom? did you change injector plugs?

doesnt sound like vaccume leak.

i'd be semi suspicious about the 26 ecu./ modded

what are the injectors scalled at?

[Medium Dave]

I had a similar issue and it turned out to be the cas... or was it the computer... one of the two anyways

Edited June 25, 2009 by Medium Dave

[Mr. Untouchable]

also double check intake pipe, turbo to afm. anything less than 100% perfect is no good!

[Funz]

running NGK BP6RES thingy's at .8 gap, as ive always run.

Z32 running on it, car was tuned fri night, new plugs on sunday, was driving around for 2 hours before going to my mates place and testing his ignitor pack, thats when everything went pear shaped.

Injectors seem to be all firing from what we can tell. They were cleaned and flow tested when arrived, GMB got that sorted

Injector loom was properly covered up and appears intact. will have my mate down to test whole loom properly. Also gonna get friend down to double check powerfc too if possible.

Car was running perfect all weekend, one change and its fubar lol..

last night i changed coils, plugs and ignitor pack. when removing old plugs, i found cyl one plug split in half at the top of the plug, and cyl 4 plug was all wet with fuel.

[Gordie]

running NGK BP6RES thingy's at .8 gap, as ive always run.

Z32 running on it, car was tuned fri night, new plugs on sunday, was driving around for 2 hours before going to my mates place and testing his ignitor pack, thats when everything went pear shaped.

Injectors seem to be all firing from what we can tell. They were cleaned and flow tested when arrived, GMB got that sorted

Injector loom was properly covered up and appears intact. will have my mate down to test whole loom properly. Also gonna get friend down to double check powerfc too if possible.

Car was running perfect all weekend, one change and its fubar lol..

last night i changed coils, plugs and ignitor pack. when removing old plugs, i found cyl one plug split in half at the top of the plug, and cyl 4 plug was all wet with fuel.

that would do it!

[Funz]

that would do it!

even when replacing the plugs after that no change. will do further looking in to it on sat making me sad

[Jays_5000]

You didn't forget an earth when putting it back into your car?

Although it seems to be the way when you're working on your car that by total coincidence it's the time something completely irrelevant lets go.

[Funz]

only took off one earth and that was properly put back on..

have uploaded PFC sensor sw check screen for IGN only and when Idling. Only thing thats changed from when it was running well, is the WRN dot... which dont help much.

IGN

Idle

[Funz]

well, problem discovered.. ecu is not sparking cyl 4. time to give me ecu to a mate to see if he can repair burnt/broken track or even find the issue, otherwise ill have to buy new pfc

[shiftlock_anthony]

or a Haltech Pro plug-in!!

[Funz]

this chip is the culprit.. on my board it has a nice burn hole in it :S found a store in sydney that sells these chips so prob gonna buy one and see if my mate can resolder it on.

[Funz]

or a Haltech Pro plug-in!!

depends on $$ lol.

[Medium Dave]

Hmm, that looks like the mark they put on every chip to tell you which way around to install they chip. Whenever I have burnt chips (and I have blown a few ) they generally burn in the middle and they smell pretty funky...

[Funz]

Hmm, that looks like the mark they put on every chip to tell you which way around to install they chip. Whenever I have burnt chips (and I have blown a few ) they generally burn in the middle and they smell pretty funky...

that photo is not of my one lol, my one does have a nice hole burnt through the number 5 on the chip.

Edited June 28, 2009 by Funz