1jz misfiring @ idle

[dinhnerz]

Finally was able to finish up my 1jz swap into a SC300. For some reason at idle its misfiring sounds bad. This is on stock downpipe, stock cat, stock exhaust. Stock turbos no tune, no fuel upgrade. Walbro fuel pump installed.

Idle is kind of low maybe 600. Even when I raise the idle up a little bit it is still misfiring, any idea what could this be? There is no CEL code.

 

[suprastanger507mgte]

misfiring most likely is linked to ignition system.
Check coil packs and connectors thoroughly.
Check coils for cracks and bad contacts.

 

[dinhnerz]

Will definitly check coil packs again, what are the ohms for the coil packs? Will check everything in the morning.

 

[johnd]

From the reserch I've done over the past year, Missfire at idle is usually a spark plug. Cracked coils usually missfire more during boost.

 

[dinhnerz]

They're brand new Copper 3330 plugs. When I turn on the AC the misfire seems to go away. I've adjust the idle to 900 rpm now. Still misfires, but only slightly now.

Perfectly fine during boost and higher rpm. Alot smoother, only misfiring at idle.

 

[dinhnerz]

Pulled out all 6 coil packs today. They all have a air line crack on them. Any way of fixing them?

Also put on a front mount today as well. The turbo spool has a higher tone to them now. Could the IC cause them to sound different?

 

[sai_supra1jz]

Pulled out all 6 coil packs today. They all have a air line crack on them. Any way of fixing them?

Also put on a front mount today as well. The turbo spool has a higher tone to them now. Could the IC cause them to sound different?

I don't think the IC will affect the way the turbos sound at all. It can definitely help it spool faster but not how it sounds, which could be equivalent, because faster spool does change the sound.

You can fix the coil packs by using epoxy, or nail polish remover. It is recommended by many 1jz owners, especially if u don't have the budget to get new ones.

 

[Mischief7m]

I don't think the IC will affect the way the turbos sound at all. It can definitely help it spool faster but not how it sounds, which could be equivalent, because faster spool does change the sound.

You can fix the coil packs by using epoxy, or nail polish remover. It is recommended by many 1jz owners, especially if u don't have the budget to get new ones.

nail polish, not nail polish remover.....that could end badly.

i used JB weld

 

[dinhnerz]

What kind of epoxy? For plastic? Same with JB weld?

 

[Mischief7m]

i used the slow setting plastic JB