Help me!! Help me!! PLEASE!!!!
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
If the VSS signal is not getting to the ECM it will set error code 24. The SES light will come on after driving about a mile.
If the EGR system is not working correctly you will get error code 32. That one is more subtle and requires cruising at constant speed for about 5 minutes.
I recommend a minimum idle adjustment (haven't seen that mentioned in this thread) -- it cured my stalling problem:
http://forums.corvetteforum.com/1570563689-post1.html
If the EGR system is not working correctly you will get error code 32. That one is more subtle and requires cruising at constant speed for about 5 minutes.
I recommend a minimum idle adjustment (haven't seen that mentioned in this thread) -- it cured my stalling problem:
http://forums.corvetteforum.com/1570563689-post1.html
Thread Starter
Instructor
Joined: Aug 2009
Posts: 157
Likes: 4
From: Golfport Mississippi
Thread Starter
Instructor
Joined: Aug 2009
Posts: 157
Likes: 4
From: Golfport Mississippi
If the VSS signal is not getting to the ECM it will set error code 24. The SES light will come on after driving about a mile.
If the EGR system is not working correctly you will get error code 32. That one is more subtle and requires cruising at constant speed for about 5 minutes.
I recommend a minimum idle adjustment (haven't seen that mentioned in this thread) -- it cured my stalling problem:
http://forums.corvetteforum.com/1570563689-post1.html
If the EGR system is not working correctly you will get error code 32. That one is more subtle and requires cruising at constant speed for about 5 minutes.
I recommend a minimum idle adjustment (haven't seen that mentioned in this thread) -- it cured my stalling problem:
http://forums.corvetteforum.com/1570563689-post1.html
Melting Slicks
Joined: May 2006
Posts: 3,385
Likes: 4
From: King George VA
For the sake of a quick test, Id test my coil. Maybe there is a 'heat soak' issue with the coil. Has your car died just after startup (within 5-10) or is more during prolonged use? I've also experianced fuel issues where at low pressure the fuel filter would clog but as on pedal itll be fine.
Thread Starter
Instructor
Joined: Aug 2009
Posts: 157
Likes: 4
From: Golfport Mississippi
Thread Starter
Instructor
Joined: Aug 2009
Posts: 157
Likes: 4
From: Golfport Mississippi
If the VSS signal is not getting to the ECM it will set error code 24. The SES light will come on after driving about a mile.
If the EGR system is not working correctly you will get error code 32. That one is more subtle and requires cruising at constant speed for about 5 minutes.
I recommend a minimum idle adjustment (haven't seen that mentioned in this thread) -- it cured my stalling problem:
http://forums.corvetteforum.com/1570563689-post1.html
If the EGR system is not working correctly you will get error code 32. That one is more subtle and requires cruising at constant speed for about 5 minutes.
I recommend a minimum idle adjustment (haven't seen that mentioned in this thread) -- it cured my stalling problem:
http://forums.corvetteforum.com/1570563689-post1.html
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Melting Slicks
Joined: Aug 2008
Posts: 2,082
Likes: 50
From: Palmdale CA
Drifting
Joined: May 2013
Posts: 1,736
Likes: 31
From: Reno Nevada
I generally don't approve of the minimum idle air procedure, because after it is done, 15 minutes later it can change. I prefer small changes will observing IAC counts, and tune to counts of 20 to 80 with 40 to 60 being best. The TPS will have to be adjusted on mass air cars after setting throttleblade.
Of course only an owner will have time, and desire to get it right using this method. A shop will use the procedure, and owner is stuck with result.
Last edited by MrWillys; Nov 20, 2013 at 03:04 PM.
Thread Starter
Instructor
Joined: Aug 2009
Posts: 157
Likes: 4
From: Golfport Mississippi
If the VSS signal is not getting to the ECM it will set error code 24. The SES light will come on after driving about a mile.
If the EGR system is not working correctly you will get error code 32. That one is more subtle and requires cruising at constant speed for about 5 minutes.
I recommend a minimum idle adjustment (haven't seen that mentioned in this thread) -- it cured my stalling problem:
http://forums.corvetteforum.com/1570563689-post1.html
If the EGR system is not working correctly you will get error code 32. That one is more subtle and requires cruising at constant speed for about 5 minutes.
I recommend a minimum idle adjustment (haven't seen that mentioned in this thread) -- it cured my stalling problem:
http://forums.corvetteforum.com/1570563689-post1.html
Did set the voltage on TPS. It was at .36 and I put it at .54. It idled very smoothly and ran for quite a long time with NO stalling. Will not know for sure until I get out and drive it.
Thanks for y'all's patience and the very clear directions.
Le Mans Master
Joined: May 2004
Posts: 5,866
Likes: 60
From: Hellinois
Finalist 2020 C4 of the Year - Modified
Idle speed is called for in the programming, and the ecm is constantly trying to adjust for said programmed idle speed. Only a mis-adjusted throttleblade, or a device not reporting properly can change what is called for. A fully warmed automatic car in gear is close to 600, and a manual is 700. Open the throttleblade too far, and it will rise as it leans the mixture with too much air, and of course the opposite.
I generally don't approve of the minimum idle air procedure, because after it is done, 15 minutes later it can change. I prefer small changes will observing IAC counts, and tune to counts of 20 to 80 with 40 to 60 being best. The TPS will have to be adjusted on mass air cars after setting throttleblade.
Of course only an owner will have time, and desire to get it right using this method. A shop will use the procedure, and owner is stuck with result.
I generally don't approve of the minimum idle air procedure, because after it is done, 15 minutes later it can change. I prefer small changes will observing IAC counts, and tune to counts of 20 to 80 with 40 to 60 being best. The TPS will have to be adjusted on mass air cars after setting throttleblade.
Of course only an owner will have time, and desire to get it right using this method. A shop will use the procedure, and owner is stuck with result.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
I prefer around 50 steps at idle myself.
The ECM has a tolerance on the idle. If it gets within 50 RPM (75 RPM in certain conditions) of the target RPM it stops adjusting.
One thing I have never seen (but would like to) is the relationship between IAC steps and RPM. How many steps does it take to change the RPM by 100, for example?
Instructor
Joined: Jun 2013
Posts: 223
Likes: 7
From: Gatlinburg Tennessee
This reply may prompt snickers and even guffaws. Oh well, ain't the first time. I had this happen several years ago with an old VW Beetle. I had put in a new engine and rebuilt practically every inch of the car. Then the engine started conking out. Took it to mechanics more times than I can count and just when we thought we had the problem solved, it would conk out again. New fuel pump, filter, fuel lines, on and on----I was getting ready to push the car off a cliff. Finally, a mechanic decided to pull the fuel tank. Sure enough, he found a leaf that had somehow gotten into the tank. Probably when I was pumping gas on an autumn day, who knows. The engine would run fine until the fuel level got a little low and then the leaf would clog up the works. That was it. The old thing ran fine after that. Probably a silly notion, but it was the first thing I thought of when I read your post. Good luck---I feel your pain. 
Safety Car
Joined: Nov 2008
Posts: 4,328
Likes: 15
From: Jacksonville FL
My experience is electronics malfunctions throw codes but fuel issues do not.
Thread Starter
Instructor
Joined: Aug 2009
Posts: 157
Likes: 4
From: Golfport Mississippi
I haven't had a chance to drive it since following Cliff Harris' instructions. I have left it idling in the garage and it has not stalled. Put fuel pressure gauge on and when I turn the ignition to on position, it goes to 40 pounds of pressure, then drops to 20 pounds instantly. Hard to start, but once it starts it goes to 39 pounds of pressure. Once I turn the engine off, it goes down to 20 pounds of pressure and bleeds off in a matter of a minute or so, I assume I have an internal leak somewhere. I think it is injectors.
Try the search for the procedures on how to find out exactly what it is that is leaking pressure. I can't remember now what they were.