Another Rb25 Misfire Topic

[fmlycar]

Misses like mad at idle and drives like a Rex and plenty of black smoke now.

New o2 sensor ordered, new coil packs ordered, fuel filter purchased ready to fit.

Wideband will be next week

[fmlycar]

Car wouldn't even idle this morning and stalled. Hopefully my parts arrive quickly so I can get this sorted

[Cowboy1600]

Have your changed the plugs?

[XRATED]

Your plugs will more than likely to be covered in junk by now.... this will cause the increase severity of the misfire problem.

You can learn a lot from pulling the plugs and 'reading' them (although it may be to late now). I'd suggest you pull them asap and post up photo's (keep them in order).

Replace the plugs and at least you will be able to drive it again for a few km's.

Honestly I can't see your O2 sensor being the problem (just unplug it if you aren't sure), fuel filter is a good service item, but unlikely to stop you from miss firing. A wide band is only going to help if the mixtures are actually getting burnt.... as soon as it misses, you will just get rich afr's off the scale-

I'd be buying/borrowing a new coil pack loom and a known good ignition module before buying another set of coil packs.

If you still have issues, pull the injectors and get them cleaned/flow tested.

after that... take it to a mechanic.

[CEF33Y]

I had similar issues with my R33 s2.

I had checked and resoldered the pins in the afm for the plug, made no difference, but it was actually dry joints on the afm board itself. Fixed those up and she's been apples.

Also, is the z32 afm genuine? There are copies floating around

[fmlycar]

Xrated, it's a s2 motor so the ignitor is built into the coil pack. Unplugging the o2 sensor doesn't make any difference atm so I'm replacing it anyway.

Cef33y, I'll see if anyone in town has a z32 afm I can borrow. I double checked and mine is genuine.

[fmlycar]

Resoldered afm pins and no go

[Cowboy1600]

Change your plugs. You may have fixed the issue but they are too far gone now.

[fmlycar]

Yeah I'll wait until coil pack rock up and throw some new ones in then

[Cowboy1600]

I had the same thing happen to my Stag. I was sitting at the lights one day and it started running real rough. By the time I got home the car was real rough. I turned it off and it wouldn't start again. Checked this, that and the other, no good. Pulled the plugs and they looked OK, although a touch dirty. Changed them and bammo, car fine again.

[Hadouken]

He already changed plugs about 3 times though.

[fmlycar]

Will throw some new plugs in when the coil packs arrive. Had a look last night and they were wet with fuel

[Dose Pipe Sutututu]

Jam a multimeter in your car and see if your voltage drops as there's load on your motor or if you can just log it from your ecu.

I had a shit house misfire problem too, turns out was my stock alternator playing up. On idle, it would show up 13.8V but as soon as you increase the RPM it would drop to around 12.2V. Replaced it with a brand new Circuit Sports one and misfire gone!

[fmlycar]

Nah, voltage is around 14.4-14.6 and doesn't change

[scotty nm35]

I had a similar issue on a 34 the other day, turns out the Z32 afm plug on the wiring side had a wonky pin, this is why you buy new Bosch plugs not shitty old VL ones from the wreckers.

[fmlycar]

New coil packs, new 02 sensor, new tps, new plugs. Starts, Idles and drives fine and smooth. As soon as you try and boost it, feels doughy as and misses and doesn't make any power. Still yet to fit a new fuel filter.

Still have to find another afm to try yet

[fmlycar]

Could it be an injector stuck open?

Drove it to work and noticed a slight miss at cruise and idle

[fmlycar]

Checked continuity on coil pack loom and all ok. Pulled plug 1 and black and sooty after 15km of driving. This is driving me nuts.

[Hadouken]

If it was a particular injector then could you not pull each spark plug and see which ones look suspect?

Also, dude I think it's time to take it to a workshop.

[fmlycar]

Any workshops in Alice Springs NT you could recommend?

Its something that isn't affecting just 1 cylinder as the last lot of plugs were all sooted up. I just feel like I've gone over everything twice without any luck.