Need help with idle problem
Thread Starter
Le Mans Master
Joined: Aug 2000
Posts: 6,273
Likes: 14
From: Austin TX
Need help with idle problem
My 99 has had an occasional idle/dieing problem that is getting worse.
Over the past couple of years, the engine will die at idle - sometimes when cold, sometimes when hot. Usually it clears up and idles normally after driving a couple of miles.
This has been happening more frequently and yesterday it died nine time while exiting a parking garage. Then it cleared after driving a mile or so.
The car just had a minor tune up by very experienced Corvette mechanics that did not reveal any vacuum leaks. No codes are being shown and no Check Engine Light shows. I cleaned all grounds about a year ago. The ECU has a custom tune that is otherwise great so I don't think it is a MAP problem.
Any ideas as to why this is happening will e welcome.
Thanks
Over the past couple of years, the engine will die at idle - sometimes when cold, sometimes when hot. Usually it clears up and idles normally after driving a couple of miles.
This has been happening more frequently and yesterday it died nine time while exiting a parking garage. Then it cleared after driving a mile or so.
The car just had a minor tune up by very experienced Corvette mechanics that did not reveal any vacuum leaks. No codes are being shown and no Check Engine Light shows. I cleaned all grounds about a year ago. The ECU has a custom tune that is otherwise great so I don't think it is a MAP problem.
Any ideas as to why this is happening will e welcome.
Thanks
Race Director
Joined: May 2012
Posts: 15,748
Likes: 3,266
From: Phoenix area, AZ
Give it a good cleaning anyway. You'd be surprised at how much just a little bit of gunk can change things. If it persists I'd start looking at the vacuum lines.
Thread Starter
Le Mans Master
Joined: Aug 2000
Posts: 6,273
Likes: 14
From: Austin TX
Hi Ed
I cleaned the throttle body as you suggested. It wasn't to bad in front of the blade but filthy behind. Idle is much better now. Thanks for the tip.
Does this mean that the inside of the intake manifold is as dirty as the backside of the throttle body? If so, how do I clean it up?
Thanks again.
I cleaned the throttle body as you suggested. It wasn't to bad in front of the blade but filthy behind. Idle is much better now. Thanks for the tip.
Does this mean that the inside of the intake manifold is as dirty as the backside of the throttle body? If so, how do I clean it up?
Thanks again.
Race Director
Joined: May 2012
Posts: 15,748
Likes: 3,266
From: Phoenix area, AZ
Hi Ed
I cleaned the throttle body as you suggested. It wasn't to bad in front of the blade but filthy behind. Idle is much better now. Thanks for the tip.
Does this mean that the inside of the intake manifold is as dirty as the backside of the throttle body? If so, how do I clean it up?
Thanks again.
I cleaned the throttle body as you suggested. It wasn't to bad in front of the blade but filthy behind. Idle is much better now. Thanks for the tip.
Does this mean that the inside of the intake manifold is as dirty as the backside of the throttle body? If so, how do I clean it up?
Thanks again.
Race Director
Joined: May 2012
Posts: 15,748
Likes: 3,266
From: Phoenix area, AZ
That's a very good question. Hopefully one of the more knowledgeable members can answer it for us, because I really don't know. I've never seen an intake off of the engine so I don't know how things flow inside of one.
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