need help with 92 convertible
Thread Starter
Intermediate
Joined: Aug 2011
Posts: 31
Likes: 0
Thread Starter
Intermediate
Joined: Aug 2011
Posts: 31
Likes: 0
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
You have probably seen this, but just in case, the FSM on p. 8A-82-15 suggests that an erratic digital display without codes set in the CCM could have an open in circuit 150 to terminal A7 of the instrument cluster connector. If your symptoms are intermittent, maybe a loose or poor connection?
Thread Starter
Intermediate
Joined: Aug 2011
Posts: 31
Likes: 0
You have probably seen this, but just in case, the FSM on p. 8A-82-15 suggests that an erratic digital display without codes set in the CCM could have an open in circuit 150 to terminal A7 of the instrument cluster connector. If your symptoms are intermittent, maybe a loose or poor connection?
Today I cleaned the ground connections under the passenger side kick panel --they were very clean but I cleaned them again and rebolted --- started the car -- no change! The speedo problem is still there. Arghhh! Has anyone heard anything about an ungrounded coil causing this problem? I talked to a guy named Killebrew -- he thought the problem was in my ECM (it wasn't) but he also mentioned something about the coil not being grounded properly. Any ideas of what proper grounding for the coil looks like? I forgot to mention that just for good measure I checked my RPO codes to confirm the vehicle has the correct speed sensor -- it does! Back to the drawing board.. I find it interesting that a search on this forum for "speedometer random numbers" gives results that show this problem isn't rare -- a number of people have experienced it -- but from reading the search results -- it has never been solved.
Last edited by givip; Aug 25, 2012 at 11:33 PM. Reason: update
Drifting
Joined: Jun 2010
Posts: 1,853
Likes: 8
From: Westerly RI
I've got the FSMs and have looked at your possibilities but that looked very good --- clean with good connections. The problem isn't erratic -- it is very predictable -- it does it everytime as soon as the vehicle is started.
Today I cleaned the ground connections under the passenger side kick panel --they were very clean but I cleaned them again and rebolted --- started the car -- no change! The speedo problem is still there. Arghhh! Has anyone heard anything about an ungrounded coil causing this problem? I talked to a guy named Killebrew -- he thought the problem was in my ECM (it wasn't) but he also mentioned something about the coil not being grounded properly. Any ideas of what proper grounding for the coil looks like? I forgot to mention that just for good measure I checked my RPO codes to confirm the vehicle has the correct speed sensor -- it does! Back to the drawing board.. I find it interesting that a search on this forum for "speedometer random numbers" gives results that show this problem isn't rare -- a number of people have experienced it -- but from reading the search results -- it has never been solved.
Today I cleaned the ground connections under the passenger side kick panel --they were very clean but I cleaned them again and rebolted --- started the car -- no change! The speedo problem is still there. Arghhh! Has anyone heard anything about an ungrounded coil causing this problem? I talked to a guy named Killebrew -- he thought the problem was in my ECM (it wasn't) but he also mentioned something about the coil not being grounded properly. Any ideas of what proper grounding for the coil looks like? I forgot to mention that just for good measure I checked my RPO codes to confirm the vehicle has the correct speed sensor -- it does! Back to the drawing board.. I find it interesting that a search on this forum for "speedometer random numbers" gives results that show this problem isn't rare -- a number of people have experienced it -- but from reading the search results -- it has never been solved.
No idea where that leads, expense- or availability-wise.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
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
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
