Stalling 1JZ

[The Reaper]

my 1J will not idle worth a damn!! anytime i come up to a light it tries to stall. it idles at like 400 rpm and then it starts to die. its as if i have a vented BOV on my 7M or something. it stalled out 7 times this morning during a 20 min drive to work. i dunno whats causing this.

when i first start it and its cold it idles around 900 and doesn't stall but once it begins to warm up it dies. i have to feather the throttle at the light to keep it running.

what could cause this?

 

[tissimo]

it stalls sometimes, not every time (at least when I've been in the car).. We've set the tps to 2jz specs and still doesn't work. We've pulled a vac line on the intake (should idle up) and it still idles at like 400-500 rpm. For some reason the ecu keeps pulling the isc duty...

 

[The Reaper]

well yea not every light but it would if i didn't keep the throttle feathered

 

[Brewster]

Mine idles low too, dunno why. I keep the air on and it will idle fine.

 

[Big Wang Bandit]

Mine idles high,

Sometimes it idles at like 500 RPM, and sometimes at almost 1000.

Turning on electrics lowers the idle, Rear defroster, heater, headlights.

Odd

 

[Ric]

I have an ISV motor i can sell to someone $50 shipped... I removed it to clean the engine bay.

 

[annoyingrob]

My car idled like this once too. What I did was adjust the idle screw inward a bit, then re-position the TPS back to spec, then pulled the EFI fuse for 30 minutes, came back, and cranked her.

If it cold idles at 900, then you MIGHT have a blockage somewhere in the ISCV's path, but I'm not sure. My car cold idles at 1500, but that's REALLY cold

Edit: It took me a year to get my 1JZ to properly idle..... ugh. There's a thread about it on SF somewhere.

 

[The Reaper]

yea i dont know what it is. im willing to bet the IAC valve is not bad something else is wrong

i have no A/C so that doesn't help and i prefer it to idle at 900-1000 i hate low idling cars

 

[annoyingrob]

If you want a quick solution, start it up when it's cold, and idling at 900, then pull the plug off the ISCV so that it stays in that position.

 

[Big Wang Bandit]

I may go fool with the ISCV later


Thanks for pointing me in that direction.

 

[Ric]

I set my idle to 1500. With a 3in turbo back exhaust and a blown out apexi muffler, it sounds good

Get a longer screw for the throttle body adjustment at any hardware store and pick up a piece of aluminum stock while your at it

 

[The Reaper]

ididn't know there was an idle adjustment screw......hmmmmm

 

[Ric]

yup its a tiny allen head with a locking nut

 

[The Reaper]

well to my knowledge there isn't an idle adjustment screw. just the screw to adjust the throttle plate

 

[Ric]

yes, its on the throttle body. Just like setting the idle on a lawn mower

 

[The Reaper]

interesting

the only thing i've heard of is adjusting the throttle plate it self.

like the butterfly to be open move as if yur slightly giving it gas. i dont believe there IS an actual idle screw.

 

[Ric]

interesting

the only thing i've heard of is adjusting the throttle plate it self.

like the butterfly to be open move as if yur slightly giving it gas. i dont believe there IS an actual idle screw.

yeah, thats what an idle adjustment screw does. The factory one isn't long enough to set idle on its own, so just buy a longer bolt at the hardware store and done.

The factory screw is just for fine tuning with the idle motor. My 93 had a problem of idling too low with the AC on.. a quick twist, fixed.

 

[The Reaper]

so yur talking about the threads on the actual throttle cable???or what?

got a picture???

 

[annoyingrob]

No, there is a screw that adjusts the resting place of the throttle plate.

 

[Ric]

Just look at the throttle body. Can't miss it.