1JZGTE issue

[Officer Doofy]

Mine does a very similar thing when cold, a slight miss/hesitation when cold just before coming on to boost. It doesn't really bother me as I usually baby it around until it's at operating temp, at which time the miss is gone.
I just did a quick service this arvo, new plugs oil & filters, plus while the coils were out I used that liquid electrical tape on them to fix the cracks in the coils (even though they wern't causing any noticable miss), and I just noticed it had the same hesitation when cold. That's with all standard management, plus a home made FCD.

Maybe your caps in your ecu are leaking worm
It can sometimes be hard to see them leaking

[MR 1JZ]

Maybe your caps in your ecu are leaking worm
It can sometimes be hard to see them leaking

+1 for caps on worms ecu being forked

[BigWorm]

Yeah, it's totally my caps.
Oi doofy, gimme your spare ecu, DC.

[DenZel]

mine also does the same thing - seems like a very common problem with the 1jz?

i have the same misfiring/backfire issue, and when starts to hit boost has hestitations

then once warm...is no worries, idles fine and drives well across the rev range

anyone found the most common fix for this?? as still seems a bit up in the air, ppl checking/replacing pulgs,coils and still having this issue

weird such a common issue with the 1jz -

!!gotta figure out why the transition from cold to warm makes such a difference!!

[Jabtronic]

My 1J so far also seems to have this problem, it sometimes blows smoke and runs rich (spitting out fuel) when cold but when it's warm no problems.

[Danners]

mine also does the same thing - seems like a very common problem with the 1jz?

i have the same misfiring/backfire issue, and when starts to hit boost has hestitations

then once warm...is no worries, idles fine and drives well across the rev range

anyone found the most common fix for this?? as still seems a bit up in the air, ppl checking/replacing pulgs,coils and still having this issue

weird such a common issue with the 1jz -

!!gotta figure out why the transition from cold to warm makes such a difference!!

Mine never used to really hesitate when coming on boost, it used to "fart" a bit higher up in the rev range though. I pulled all of my coilpacks out and used electrical glue on them... all sorted.

[Ribfeast]

I found when I had a clogged fuel filter it tended to misfire a bit in the upper end of the rev range as it was running out of fuel.
But I'd be putting it down as cracks under the coilpack boots, fouled/incorrect plugs/incorrect plug gap, or crook ECU capacitors.

[fatboy13]

yeah well coils ive checked and double checked... plugs are new and gapped properly.... and yeah i guess i should check the ECU.

It only happens just before coming on boost on light to medium throttle... high up in the revs, and coming on boost hard its great....

[Ribfeast]

Even under the rubber boots?
Maybe even TPS is faulty?

[EldarO]

mine currently does this...

because of the crack coilpacks, it misses up high...

and because of the small plug gap, it misses until its warm (0.7mm gap)

if i change the plugs out for 0.8mm gapped ones, the missing while cold stops, but the car breaks down on boost.

[fatboy13]

yeah i was thinking about the TPS cos we set the haltech up to read it so i might return the map to being completely standard and see how it goes then...

[Danners]

mine currently does this...

because of the crack coilpacks, it misses up high...

and because of the small plug gap, it misses until its warm (0.7mm gap)

if i change the plugs out for 0.8mm gapped ones, the missing while cold stops, but the car breaks down on boost.

Exactly the same problem as i'm currently having in the morning. I'm trying some BCPR6E plugs today. I'll gap them to .8mm and see how it goes... then gap to .7 if necessary

[Dieseltrain]

Im running Iridiums at 0.72 gap and have no issues Dead cold, and no issues at 18.5psi of boost

Bkr6eix's i think they are.