Idle issues..still :banghead: NEED HELP!!!!
Thread Starter
Team Owner
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From: Here
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Idle issues..still :banghead: NEED HELP!!!!
Ok, back in April had the cam installed 224/222...car was tuned and ran great...a couple weeks later I added and aftermarket airbridge...no problems...drove to CI and back car ran great. Nothing else done to the car.
The problem I am having is at idle...sometimes right after startup and sometimes not until I drive it a ways....when I come to a stop the idle drops down and sometimes "hunts" between 750 and 200 bouncing up and down...sometimes it dies which is a real PITA
There seems to be no real corelation between heat/ humidity etc. when it happens.
I have been back to the tuner and the car checks out fine.
To date I have changed plugs and wires (one wire was in fact going bad)
Removed the after market airbridge and went back to stock (seemed to cure the problem temporarily, like 2 hours
)
I have cleaned the throttle body and air filter (Blackwing)
Oh yeah the TB was drilled at cam install time.
I have checked all connections so many times I am going
So....what I need to know...could this be a fuel problem??? It seems to me that if it was I would notice it other than at idle. It does have the stock fuel filter and pump. Currently I have 58K on it and I run Redline S-1 thru it pretty religiously.
Next could it be a faulty sensor?? Someone suggested that the MAT sensor could be bad giving it a wrong reading...
I have no F'ing idea at this point
Any thought suggestions or tips would be greatly appreciated.
*******REPEAT****Car was tuned perfectly...this occured AFTER I had the car for awhile so this has developed on its own.....which is what leads me to believe it has to be a fuel / air or sensor problem.
I have no reason to believe that if it was a tuning issue it wouldn't have been fixed...I am only considering asking to get it wiped and retuned to simply rule that out....this has got to be something simple I just don't want to throw money at the car in hopes that I get it
The problem I am having is at idle...sometimes right after startup and sometimes not until I drive it a ways....when I come to a stop the idle drops down and sometimes "hunts" between 750 and 200 bouncing up and down...sometimes it dies which is a real PITA
There seems to be no real corelation between heat/ humidity etc. when it happens.I have been back to the tuner and the car checks out fine.
To date I have changed plugs and wires (one wire was in fact going bad)
Removed the after market airbridge and went back to stock (seemed to cure the problem temporarily, like 2 hours
)I have cleaned the throttle body and air filter (Blackwing)
Oh yeah the TB was drilled at cam install time.
I have checked all connections so many times I am going
So....what I need to know...could this be a fuel problem??? It seems to me that if it was I would notice it other than at idle. It does have the stock fuel filter and pump. Currently I have 58K on it and I run Redline S-1 thru it pretty religiously.
Next could it be a faulty sensor?? Someone suggested that the MAT sensor could be bad giving it a wrong reading...
I have no F'ing idea at this point
Any thought suggestions or tips would be greatly appreciated.
*******REPEAT****Car was tuned perfectly...this occured AFTER I had the car for awhile so this has developed on its own.....which is what leads me to believe it has to be a fuel / air or sensor problem.
I have no reason to believe that if it was a tuning issue it wouldn't have been fixed...I am only considering asking to get it wiped and retuned to simply rule that out....this has got to be something simple I just don't want to throw money at the car in hopes that I get it
Last edited by pewter99; Sep 19, 2004 at 09:52 AM.
Burning Brakes
Joined: Sep 2001
Posts: 1,173
Likes: 1
From: Aguila AZ
If your tuner cannot solve these problems with that small cam, get another tuner that knows what he is doing. Your problems are very common and there is nothing wrong with your hardware, wiring or sensors. You need to address the VE tables, AIR table, spark tables and idle settings. This can be done with HP Tuner or LS1Edit. You should also tune your WOT A/F ratio and L-Trims using the same tuning suite.
Shirl
SDRE
Shirl
SDRE
Le Mans Master
Joined: Jan 2003
Posts: 6,298
Likes: 0
From: Tyler TX
Originally Posted by MrEracer
If your tuner cannot solve these problems with that small cam, get another tuner that knows what he is doing. Your problems are very common and there is nothing wrong with your hardware, wiring or sensors. You need to address the VE tables, AIR table, spark tables and idle settings. This can be done with HP Tuner or LS1Edit. You should also tune your WOT A/F ratio and L-Trims using the same tuning suite.
Shirl
SDRE
Shirl
SDRE
Safety Car
Joined: Mar 2002
Posts: 4,928
Likes: 1
Cruise-In V Veteran
St. Jude Donor '09
Originally Posted by MrEracer
If your tuner cannot solve these problems with that small cam, get another tuner that knows what he is doing. Your problems are very common and there is nothing wrong with your hardware, wiring or sensors. You need to address the VE tables, AIR table, spark tables and idle settings. This can be done with HP Tuner or LS1Edit. You should also tune your WOT A/F ratio and L-Trims using the same tuning suite.
Shirl
SDRE
Shirl
SDRE
Last edited by Bink; Sep 18, 2004 at 01:12 PM.
Thread Starter
Team Owner
Joined: Dec 1999
Posts: 174,312
Likes: 1,217
From: Here
Pilot of Beer Force 1
Tampa Regional Coordinator
CI 4-5-6-7-8 Veteran
Organizer St. Jude Fundraiser
I believe in the Beer Fairy
hmmm....I have not and will not say who did what...but I am considering getting a second opinion
Thread Starter
Team Owner
Joined: Dec 1999
Posts: 174,312
Likes: 1,217
From: Here
Pilot of Beer Force 1
Tampa Regional Coordinator
CI 4-5-6-7-8 Veteran
Organizer St. Jude Fundraiser
I believe in the Beer Fairy
Gonna call on Monday and see about having the program wiped and redone...maybe there is a glitch somewhere..car died on me twice today..........in my driveway
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Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
I had some VERY strange electrical problems a while back and solved them by cleaning my ground connections. Check out this post:
http://forums.corvetteforum.com/show...post1548248859
BC
http://forums.corvetteforum.com/show...post1548248859
BC
Drifting
Joined: Sep 2001
Posts: 1,421
Likes: 3
From: Memphis Tn
This is common with drilled tb's, as mentions above. Being a 99', some 02 sensors wouldn't hurt either, they do get dirty and go bad causing your pcm to recalibrate, but that drilled tb is the first issue.
Thread Starter
Team Owner
Joined: Dec 1999
Posts: 174,312
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From: Here
Pilot of Beer Force 1
Tampa Regional Coordinator
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I believe in the Beer Fairy
So do you think the 02 sensors could cause this problem??
How do I check them??
How do I check them??
Team Owner
Joined: Mar 1999
Posts: 28,753
Likes: 9
From: San Jose/Bear Valley CA
CA Events Coordinator
In the interest of Science, remove your blackwing (almost typed blackwang) 
and re-install your stock air filter... that could be one contributing factor as some cars dont like the blackwing. My car didnt like a boosted MAF so I know how those kind of things go...
Next, get a non drilled TB and install that and then take it to a tuner who can tune the car correctly.
Best of luck to you getting it fixed.. keep us posted.
VR
and re-install your stock air filter... that could be one contributing factor as some cars dont like the blackwing. My car didnt like a boosted MAF so I know how those kind of things go...Next, get a non drilled TB and install that and then take it to a tuner who can tune the car correctly.
Best of luck to you getting it fixed.. keep us posted.
VR
Thread Starter
Team Owner
Joined: Dec 1999
Posts: 174,312
Likes: 1,217
From: Here
Pilot of Beer Force 1
Tampa Regional Coordinator
CI 4-5-6-7-8 Veteran
Organizer St. Jude Fundraiser
I believe in the Beer Fairy
Well thats out...Blackwing has been on the car for 3 1/2 years and I do not have the stock system anymore.
Race Director
Joined: Mar 2001
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From: Bonneville Salt Flats
It would seem you have some worthwhile suggestions to start with, especially the throttle body issue. All the things you have done may have been fine until you made the final change and then things don't play well togethter... think typical desktop or notebook computer. 
All the best.
All the best.
Melting Slicks
Joined: Feb 2002
Posts: 2,613
Likes: 0
From: Winston Salem NC
Originally Posted by MrEracer
If your tuner cannot solve these problems with that small cam, get another tuner that knows what he is doing. Your problems are very common and there is nothing wrong with your hardware, wiring or sensors. You need to address the VE tables, AIR table, spark tables and idle settings. This can be done with HP Tuner or LS1Edit. You should also tune your WOT A/F ratio and L-Trims using the same tuning suite.
Shirl
SDRE
Shirl
SDRE
Your VE's are likely not right and is a must place to start. Also, plug the hole in the t.blade. Not a good sign if the tuner did it. It's not needed on a C5.