2J Cold idle iac range?

St1ckR1C3
Posts: 3
Joined: Sat Aug 11, 2018 3:01 am

2J Cold idle iac range?

Postby St1ckR1C3 » Sat Aug 11, 2018 3:31 am

All,

New to the board and have some cold tuning questions for a 2J.

Specs are

Built motor with 9.5:1Compression
ID2000
Hypertune Intake with 102mm TB
GSC S2 cams
GTX4508r

Before it took forever to fire up, but something happen recently where I had to go back and readjust the set screw for the throttble body to be held open just a bit more to get it to idle warm at 1200 rpms and 50 percent IAC duty. Since its summer its 80 to 90 degrees out so I messed with the post enrich and prime maps but I'm still needing to hold the throttle open just abit like 1.5 to 2 percent to get it warm or it will die.

Just wonder if those two maps are what I need to mess with more to get it to idle while cold, or maybe can some one point me to the right path on which i need to do first such as the post enrich or the pluse prime. Idle A/F was 14.0 now bumped it down to 13.5 and seems to be a bit smoother.

Thanks,

JimKden
Posts: 435
Joined: Wed Jan 12, 2011 3:28 am

Re: 2J Cold idle iac range?

Postby JimKden » Sat Aug 11, 2018 5:50 am

What % open is the idle valve when you have to hold accelerator to maintain idle rpm?

St1ckR1C3
Posts: 3
Joined: Sat Aug 11, 2018 3:01 am

Re: 2J Cold idle iac range?

Postby St1ckR1C3 » Sat Aug 11, 2018 7:19 am

100 percent open on the iac, so I think its just not enough. When warm, I see iac at 50 percent with 1200 rpm idle, I can do 1150 or so but it gets choppy.

JimKden
Posts: 435
Joined: Wed Jan 12, 2011 3:28 am

Re: 2J Cold idle iac range?

Postby JimKden » Sat Aug 11, 2018 9:31 am

You are on the right track. You may want to open the throttle min setting some more, Usually during hot idle the IAC is almost closed.

St1ckR1C3
Posts: 3
Joined: Sat Aug 11, 2018 3:01 am

Re: 2J Cold idle iac range?

Postby St1ckR1C3 » Sat Aug 11, 2018 3:32 pm

Okay, cool good to know so I could adjust the throttle plate, when warm the iac should be around 10 percent or so I'm assuming?


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