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Well my 92 305 rs, isnt working again. I sent it out and had it rebuilt ($300). put it in and worked great for a month or so . now it seems any time its damp out it stops.
odometer stops too, but cruise works fine, also no leaks in the car everything is dry
anyone esle having issues when its wet out
I have this exact issue. Did you have any luck with this five years ago?
EDIT: I also have a 92 RS (TBI) 305, but I haven't had my cluster serviced. I'll probably check the resistor, clean the contacts, and report back.
Last edited by Moonlight137; Mar 8, 2021 at 02:14 PM.
Replaced the 150uF 24V capacitor in my gauge cluster, also cleaned and polished the contacts on that daughter board as well as the main cluster contacts.
My gauge now works again.
p.s. I doubt the resistors need to be replaced, these caps are just most likely dried out and popped.
Riddle me this batman...my cluster is working except my speedo and odometer. Could you give me an educated guess on that one? It's my 17yr olds 1st car and on the way back from getting the exhaust done we were doing 70 in a 55 and he just didn't think to look at his phones speed app. we got lucky, with getting the shift kit and new rear this week i need to get that fixed. he's chomping at the bit! Thank you! p.s. we checked the gears for speedo in the tranny and they are good. Can that whole piece go bad? Just confused since the other gauges work.
I know it has been several yeas since you posted this...just curious if you ever got the speedometer and odometer fixed or working? I have a 92 Camaro doing the same thing...stumped at this point on what to do.
I have a 91 Z28 that the odometer and trip meter were not working at all. The speedometer would start working after driving it down the road a few miles. Thinking this had to be a leaky capacitor and the fact the resistor measured the correct resistance I first replaced the capacitor. It worked for exactly 5 tenths of a mile and stopped again.
I brought it back home and replaced the resistor and retried it. I have put on close to 70 miles and the odometer and speedometer all seem to work as they should. I was a little surprised as the resistor measured what it should but maybe as it heated up it failed? The only other explanation is that there was a poor factory solder joint on this connection. I just did not have the patience to test out this theory.
Thanks for everyone that has contributed to this thread.
So my 92 Z-28 Odometer failed. I pulled the circuit board. Inspection revealed several components have failed. I can read the resistors[ 2 failed] but I can't identify the capacitors[ 1 exploded - Not the 150 micro F cap] The numbers that I read are as follows: K5R - 103M; K1R - 102K; K5R - 104K. The resistor are 3.9 ohms; 100k ohms ; 75k ohms. Anybody have access to parts manuals who can cross reference these numbers?
Solved!
The B4C and Z28 have a 145MPH Speedometer, where regular Camaro's have a 110MPH Speedo.
THE SPEEDOMETER BOARDS ARE DIFEERENT!
I bought one from West Coast Autoparts and it worked but red 90 MPH when I was going 60 (approx).
They told me the boards were the same. WRONG!
They gave me an RMA and refund, and I placed a repair order for my Board and sent it to them.
I received it back in about 10 days and it works fine. Cost about $140.
My board was intermittent. They replace the capacitors and resistors, etc. and tested it.
The 145 MPH boards are almost impossible to find.
I would recommend them anytime.
Solved!
The B4C and Z28 have a 145MPH Speedometer, where regular Camaro's have a 110MPH Speedo.
THE SPEEDOMETER BOARDS ARE DIFEERENT!
I bought one from West Coast Autoparts and it worked but red 90 MPH when I was going 60 (approx).
They told me the boards were the same. WRONG!
They gave me an RMA and refund, and I placed a repair order for my Board and sent it to them.
I received it back in about 10 days and it works fine. Cost about $140.
My board was intermittent. They replace the capacitors and resistors, etc. and tested it.
The 145 MPH boards are almost impossible to find.
I would recommend them anytime.
Thanks for the suggestion, I am going to send my board in too.
Solved!
The B4C and Z28 have a 145MPH Speedometer, where regular Camaro's have a 110MPH Speedo.
THE SPEEDOMETER BOARDS ARE DIFEERENT!
I bought one from West Coast Autoparts and it worked but red 90 MPH when I was going 60 (approx).
They told me the boards were the same. WRONG!
They gave me an RMA and refund, and I placed a repair order for my Board and sent it to them.
I received it back in about 10 days and it works fine. Cost about $140.
My board was intermittent. They replace the capacitors and resistors, etc. and tested it.
The 145 MPH boards are almost impossible to find.
I would recommend them anytime.
I think the convertible z28's came with 110 mph. I could be wrong.
Got my board repair back from West Coast Autoparts, only took them 1 day to repair it and it was back out. Great support when I called in because UPS lost my package. Luckily UPS came back the next day and used GPS to track it to a house two streets over. Board now works perfectly, and they included a sheet on all the repairs they performed. Worth every penny.
this guy 😂 I’ve watched quite a few of your 3rd gen vids. I’m in the process of repairing this board. Seems like my chip and some other resistors are not working correctly either though.
Got my board repair back from West Coast Autoparts, only took them 1 day to repair it and it was back out. Great support when I called in because UPS lost my package. Luckily UPS came back the next day and used GPS to track it to a house two streets over. Board now works perfectly, and they included a sheet on all the repairs they performed. Worth every penny.
On my 92 rs heritage most of the time the speedo is fine, but every now and then it will jump up to over 100, then back to normal, what should I check for this.
It always works though, just jumps around like crazy every now and then, even when idling in park
Last edited by SlickVick; Nov 7, 2022 at 01:11 PM.
On my 92 rs heritage most of the time the speedo is fine, but every now and then it will jump up to over 100, then back to normal, what should I check for this.
It always works though, just jumps around like crazy every now and then, even when idling in park
My first guess is to look for dirty or intermittent ground connections in the gauge cluster circuit board.
Last edited by Moonlight137; Nov 7, 2022 at 09:01 PM.
1992 Firebird V8 Speedometer/odometer repair. I have no speedometer and no odometer. Replaced speed sensor buffer, VSS, etc, etc. I have searched and searched and can't seem to find my style speedometer and board anywhere. Totally different than the 91-92 Camaro boards. Here are a few pictures. I am currently replacing the odometer gear as it broken and figured I would see about repairing the board, but not sure what resistors and capacitors are needed.
1992 Firebird V8 Speedometer/odometer repair. I have no speedometer and no odometer. Replaced speed sensor buffer, VSS, etc, etc. I have searched and searched and can't seem to find my style speedometer and board anywhere. Totally different than the 91-92 Camaro boards. Here are a few pictures. I am currently replacing the odometer gear as it broken and figured I would see about repairing the board, but not sure what resistors and capacitors are needed.
Dude, I have a 1990 Trans Am with the 120 MPH speedo and my board has the same layout as yours.
I measured through the resistors and all except two of them checked out just as their color coding suggests.
What I'm talking about: In your third picture, bottom right, the small cluster of three resistors between the orange and the red components.
The outer right one is ringed out as a 75 Ohm resistor, but measured as 25 Ohms.
The one next to that (the center one) is coded to be 35 Ohms and also measured at 25 Ohms.
Now, it would be strange for a failing capacitor of this type to lose resistance. Usually it increases.
I wonder if they SHOULD measure 75 and 35 Ohms or if they are simply falsely coded. My speedo has worked fine till now, so I tend to go with wrong color coding.
Let me know if you want the resistor values of the other ones. I went through them today.
1992 Firebird V8 Speedometer/odometer repair. I have no speedometer and no odometer. Replaced speed sensor buffer, VSS, etc, etc. I have searched and searched and can't seem to find my style speedometer and board anywhere. Totally different than the 91-92 Camaro boards. Here are a few pictures. I am currently replacing the odometer gear as it broken and figured I would see about repairing the board, but not sure what resistors and capacitors are needed.
Check the color rings to a color chart for all of the resistors. Sometimes they fail, also another side note, sometimes you have to remove them from the board to test them as other resistors may interfere with the reading.
I did use a color chart for comparison. I will be taking the board apart and checking the individual components with a proper tester then, so I can order whatever needs to be replaced.
I was a little surprised as the resistor measured what it should but maybe as it heated up it failed? The only other explanation is that there was a poor factory solder joint on this connection. I just did not have the patience to test out this theory. 
