Freaking high idle
Laughing Gas
Joined: Oct 2014
Posts: 949
Likes: 187
From: Carnation, Wah
If you cannot adjust the idle down with the IAC disconnected then you are still fighting a vacuum leak or the throttle body is worn out.
that's a big air leak...
t
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5th Wheeling
Joined: Jan 2023
Posts: 25
Likes: 3
Hmm maybe but I do watch the percentages so it is working usually settles at 16 percent, but how would I test that its leaking ( assuming internally) as i have checked with propane ect
Also idle is now only about 200 rpm high which is a good improvement
Also idle is now only about 200 rpm high which is a good improvement
Fleet Mechanic
Joined: Aug 2015
Posts: 1,838
Likes: 367
From: Candy Mountain
The main problem for the IAC is crud stopping it from closing. This shouldn't be a problem on a new unit.
I would have to check but I think I have a rebuilt 4.9 throttle body in storage if you think that what you have is just worn out.
What kind of idle were you able to achieve with the IAC disconnected?
I would have to check but I think I have a rebuilt 4.9 throttle body in storage if you think that what you have is just worn out.
What kind of idle were you able to achieve with the IAC disconnected?
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5th Wheeling
Joined: Jan 2023
Posts: 25
Likes: 3
Well finally solved the problem, turns out it was the new iac valve. On a whim put the original back on to see if the iac percentage changes and wham perfect idle ,runs like crap when I unplug exactly like it should. So I now idle at 700 rpm at operating temp . Thankyou for all the help I can only assume that in the beginning there was a vacuum leak and once I repaired that I was chasing my tail due to bad brand new iac
Tuned
Joined: Jan 2021
Posts: 377
Likes: 81
Glad you got it figured out!!!!
And this is exactly why we tell so many people to not just throw $$$$ at parts they THINK might solve the problems. Today's replacement parts are not nearly as well built or QCd as in the good old days.
I had to learn this the hard way, but at least I did it with Junk Yard Parts, so it didn't hurt too badly.
And this is exactly why we tell so many people to not just throw $$$$ at parts they THINK might solve the problems. Today's replacement parts are not nearly as well built or QCd as in the good old days.
I had to learn this the hard way, but at least I did it with Junk Yard Parts, so it didn't hurt too badly.
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