Re: [Amc-list] OBD1 problem

[Wrambler242@xxxxxxxxxxx]

Doyou have your valve cover vented into the aircleaner housing?
That's a common source of IAC crud.
Maybe those 20 year old rings?  
Just a thought.
It's possible the "new" TBI was a "rebuild" er recleaned unit!
Spray it down with carb cleaner.

If it sticks again check it for being dirty.
No dirt, replace it, probably one of those "rebuilds" where they check things and if they work, they leave them!

Maybe the software you are looking at will help check this stuff.
The old DRB testers from Renault/AMC would allow you to run the IAC in and out to check idle increase and IAC operation. Pretty cool feature.

--
Mark Price
Morgantown, WV
1969 AMC Rambler, 4.0L, EFI, T-5
2004 Grand Cherokee Laredo, 4.7L, Quadratrac II
" I realize that death is inevitable.
I just don't want to be around when it happens! "

 -------------- Original message ----------------------
From: Tom Jennings <tomj@xxxxxxx>
> I had my first TBI problem this week. Idle speed went up, then way up, 
> like 1000 - 1200 rpm (I'm guessing). Though it ended up easy to diagnose.
> 
> Since the throttle linkage wasn't the problem (easy to check) it had to 
> be an air leak since the close-loop nature would treat that like open 
> throttle. I checked all the hoses, and pulled one off to verify (speed 
> increased).
> 
> I finally tapped the Idle Air Control solenoid with the 3/8" wrench I 
> had just used to sloppy-up the throttle linkage. Idle dropped to normal.
> 
> TUrns out the thing just unscrews from the body. It was dirty, odd, 
> since it's new? ANyhoo wiped it off, stuck it in, fine. Happened again a 
> few days later, but self-restored.
> 
> I didn't have any carb cleaner to squirt in the hole it goes into, but 
> I'll do that if (when) it reappears.
> 
> Never threw any codes eg. the idiot lamp never lit while running, just 
> it's normal on at start.
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