Idle issue solved
Thread Starter
Team Owner
Joined: Jan 2009
Posts: 73,568
Likes: 33
From: Somewhere in Mo
St. Jude Donor '09-'10, '14
Idle issue solved
Some of you know I have been having a couple issue lately. I first have a fuel pressure drop off issue. Pressure goes up to about 47 and then falls like a rock. Then all of a sudden, well not really all of a sudden, I have a no idle issue.
I couldn't complete the fuel pressure test adequately until I got the idle issue resolved. I at first thought they may be related but I then decided they were a separate issue. I narrowed it down to the IAC.
Well I ordered a new IAC yesterday and picked it up today. Guess what? It was the wrong one. So I called them and after they calmed me down they ordered a new one.
So I said the heck with it. I got the carb cleaner out and cleaned up the old one and put it back in. The dang thing now idles. It isn't 100% but it does idle at what I would consider 75%. So the thing still isn't working properly but I know what the issue was.
So tomorrow I will install the new IAC and see if that totally cures it but from all indications it should as it is now idling with a cleaned IAC.
I hope this helps someone in the future if you ever should do a search and come across this thread. You may PM me to speak directly to me and I will give you my phone number!!
I will come back tomorrow and give an update.
Now back to that pressure thing!
Melting Slicks
Joined: Mar 2008
Posts: 2,141
Likes: 76
From: Santa Maria, CA
Some of you know I have been having a couple issue lately. I first have a fuel pressure drop off issue. Pressure goes up to about 47 and then falls like a rock. Then all of a sudden, well not really all of a sudden, I have a no idle issue.
I couldn't complete the fuel pressure test adequately until I got the idle issue resolved. I at first thought they may be related but I then decided they were a separate issue. I narrowed it down to the IAC.
Well I ordered a new IAC yesterday and picked it up today. Guess what? It was the wrong one. So I called them and after they calmed me down they ordered a new one.
So I said the heck with it. I got the carb cleaner out and cleaned up the old one and put it back in. The dang thing now idles. It isn't 100% but it does idle at what I would consider 75%. So the thing still isn't working properly but I know what the issue was.
So tomorrow I will install the new IAC and see if that totally cures it but from all indications it should as it is now idling with a cleaned IAC.
I hope this helps someone in the future if you ever should do a search and come across this thread. You may PM me to speak directly to me and I will give you my phone number!!
I will come back tomorrow and give an update.
Now back to that pressure thing!
Le Mans Master
Joined: Sep 2006
Posts: 6,050
Likes: 147
From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
If you are having a couple issue, shouldn't u see a marriage counselor? or maybe a viagra doctor?
Hey, I just read em...............
Hey, I just read em...............
Last edited by coupeguy2001; Jan 28, 2010 at 10:59 PM.
Thread Starter
Team Owner
Joined: Jan 2009
Posts: 73,568
Likes: 33
From: Somewhere in Mo
St. Jude Donor '09-'10, '14
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
Just make sure you set the IAC before you install it , if its not already set..The pintle can't be out to far or you will damage it when you install it..I believe the setting is (28mm) out, but check to make sure. Below is a copy of the FSM install procedure for a 90 Corvette in case you need it.. .WW
http://forums.corvetteforum.com/atta...90-l98-009.jpg
http://forums.corvetteforum.com/atta...90-l98-009.jpg
Last edited by WW7; Jan 29, 2010 at 09:20 AM.
Thread Starter
Team Owner
Joined: Jan 2009
Posts: 73,568
Likes: 33
From: Somewhere in Mo
St. Jude Donor '09-'10, '14
Just make sure you set the IAC before you install it , if its not already set..The pintle can't be out to far or you will damage it when you install it..I believe the setting is (28mm) out, but check to make sure. Below is a copy of the FSM install procedure for a 90 Corvette in case you need it.. .WW
http://forums.corvetteforum.com/atta...90-l98-009.jpg
http://forums.corvetteforum.com/atta...90-l98-009.jpg
thanks
Thread Starter
Team Owner
Joined: Jan 2009
Posts: 73,568
Likes: 33
From: Somewhere in Mo
St. Jude Donor '09-'10, '14
Installed the IAC today and it did fix my idle issue, so you all know
these were my symptoms.
When I cranked it, it would not start. If I gave it the slightest bit of throttle it would fire up and run like a champ. In the beginning if I kept throttle it would eventually work itself out. But then it got to where it wouldn't idle period. Like I said if I gave it slight throttle it would run great and it ran great on the highway.
When I took the IAC out the pintle was fully extended and I didn't think that was right, and it wasn't. It is my understanding they contract so that air will flow immediately upon crank and start.
So there you have it if anyone has these symptoms now or in the future.
these were my symptoms.
When I cranked it, it would not start. If I gave it the slightest bit of throttle it would fire up and run like a champ. In the beginning if I kept throttle it would eventually work itself out. But then it got to where it wouldn't idle period. Like I said if I gave it slight throttle it would run great and it ran great on the highway.
When I took the IAC out the pintle was fully extended and I didn't think that was right, and it wasn't. It is my understanding they contract so that air will flow immediately upon crank and start.
So there you have it if anyone has these symptoms now or in the future.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
...WW
Pro
Joined: Nov 2005
Posts: 602
Likes: 0
From: North Bay Ontario
Le Mans Master
Joined: Feb 1999
Posts: 9,926
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Sorry to revive the thread. But did you ever put an ohm meter across the IAC terminals to see if it was bad?
http://shbox.com/1/iac2.jpg
http://shbox.com/1/iac2.jpg
