IAC valve.

Reply Subscribe

Thread Tools

Search this Thread

Feb 22, 2014 | 08:38 AM

#16

PRIMERED79 SHORT BED

Thread Starter

Laughing Gas

Joined: Jan 2012

Posts: 1,106

Likes: 25

Quote:

Originally Posted by subford

Have you changed the gasket yet?
Quote short bed:
"So I suspected a vacuum leak, so I sprayed some carb cleaner around and found the center bolt on the upper intake was leaking."

I plan on doing that repair next weekend, I will have to borrow the long T40 socket to get to the middle bolt.

For now I did tighten up both bolts on the drivers side and that seemed to stop the leak. My spray tests didn't seem to find any other leaks.

I might try making a smoker to test for leaks that way, just got to find something that will burn slow and produce lots of smoke.

Feb 22, 2014 | 08:41 PM

#17

PRIMERED79 SHORT BED

Thread Starter

Laughing Gas

Joined: Jan 2012

Posts: 1,106

Likes: 25

Update.
I think the idle issue has been resolved.
When I unplugged the IAC valve this morning while it was idling, it instantly started to idle rough.
Plugged it back in and checked the rpm's it was in the 600-700 area.
Did a tune up on her took her for a spin and she was idling in the same area.

I think giving the computer time to adjust is what did it, because I haven't touched anything with the idle since my first post on this subject.

Now next weekend given good weather I'll tackle the intake and valve covers.

Feb 22, 2014 | 09:02 PM

#18

danr1

Lead Driver

Joined: Aug 2006

Posts: 5,670

Likes: 13

From: Sand Lake, MI

Shouldn't have idled "rough" with the IAC unplugged, should have run just fine just at a lower rpm no other change.

IAC unplugged should result in a idle speed of about 500rpms, 500rpms but strong as in idle without issue no stumble no attempt to stall etc.

Should start unplugged also, only require aid of ever so slight bit of throttle pedal allow it do so too.