vss speedo problem cant decide if its the buffer box - Third Generation F-Body Message Boards

IROC_5796 · 10-01-2009, 11:45 PM

my speedo died after my swap from a 91 camaro rs tbi to 89 maf tpi, i think it worked for my first test drive then died, wasnt really watching it though.

i put tuner pro on it and found that it still is reading mph and tested all the leads from the buffer box but found that im not getting any signal from the output on the buffer to the speedo.

is this a normal thing to die on the buffer? just figured if one output died the whole thing would be dead not half working.

doesnt look like theres many parts inside i cant decide if i should try to fix it or just buy new, hate to buy somthing thats not the problem.

thanks

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IROC_5796 · 10-02-2009, 10:55 PM

okay so found i had another buffer box so i changed it, theres no change, still no signal on the brown wire to the speedo. i think it would be a strange coincidence for both boxes to do the same thing.

i also pulled the cluster to check on the speedo there and tested for continuity on the signal from the buffer - it checks out

the small pc board inside the cluster for driving the speedo smells like its burnt and there is corosion on the ic pins not sure if that could be a problem too nothing looks fried/burnt just coroded.

im still stumped on the fact theres no signal from the buffer box, debating on buying a new one going to try another used one when i can find one as well as a new cluster hopefully tomorrow.

if anyone has any ideas to what is up with the buffer please feel free to chime in your $.02