Re: 85 308 GTSi QV Speedo / Odo Problem | <– Date –> <– Thread –> |
From: Peter Rychel (dino308gt4![]() |
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Date: Tue, 3 Jan 2023 20:49:57 -0800 (PST) |
Like cLyDe says, 99% of the time it’s the sensor... And with my luck, I hit the 1% time and it was NOT the sensor, but the speedo. But before your rush out and buy either, check to see if the wiring is good from the sending unit to the dash. It’s easy enough because it’s two wires. Do a simple continuity test by making sure the harness is disconnected on both ends, bridge the two wires at one end (say, at the transmission) and then read the continuity on the other end (behind the dash). If it goes to zero ohms, your wires are good. If it’s infinite, then there’s a break in the wires... Somewhere. Fix that and then check to see if the gauge works again. As far as the speedo is concerned, if you can find an NOS example, get it. Don’t bother with a used unit because age and use has not been kind to these electronics. I replaced my 308 GT4 speedo, but I had to do surgery and swap out the guts from a NOS GTSi gauge into the GT4 housing. I swapped over the needle and faceplate onto the new circuit board and drive assembly. BIG, TEDIOUS job. I don’t want to ever do that again. It works great and I hope it never dies on me again while I own the car (knocking on wood while I type). I never used Palo Alto, so I can’t vouch for them. Don’t fart around, remove the steering wheel. It’s six screws and the horn button. Trust me, it gives you plenty of room to remove the gauge panel, gauges and repair the wiring if need be. Been there done that. Can’t say how the GTS binnacle comes off, because the GT4’s panel is held on with four accessible screws. Peter Sent from Mail for Windows From: Charles Perry Hi gang! I’m helping a friend repair his 308. His speedometer and odometer have both quit. He’s dug through FChat and Facebook groups for diagnostic help. The original consensus seemed to be the sending unit would be
bad. So this weekend, we removed the sending unit and tested it per this document: His is the Type 2 sensor in the document. Per the testing procedure, the sensor is good. It reads a hair over 4V with no metal in front of it, and bringing metal in close proximity to the coil makes the voltage jump to
8V. So now we’re on to what’s next. Some people have said the needle/shaft on the speedo itself binds up and may need lubrication. Some have said the speedo board itself is bad. So some questions for you 308 gurus: 1) Is there anything else we should look at? 2) What’s the easiest way to get the instrument cluster out of the dash? I’ve read that if you pull out the smaller warning lights that there are screws behind them that will release the cluster and you can draw it out
from the front without removing the steering wheel. Any additional information from those that have been there/done that? 3) If the speedo requires repair, what’s the best course? I know Palo Alto still rebuilds them. But you can also buy boards from Ricambi and some other suppliers. Any recommendations/warnings/suggestions? Thanks! -- charles |
- Re: 85 308 GTSi QV Speedo / Odo Problem, (continued)
- Re: 85 308 GTSi QV Speedo / Odo Problem Charles Perry, January 4 2023
- Re: 85 308 GTSi QV Speedo / Odo Problem Brian Keegan, January 4 2023
- Re: 85 308 GTSi QV Speedo / Odo Problem Brian Keegan, January 4 2023
- Re: 85 308 GTSi QV Speedo / Odo Problem Charles Perry, January 4 2023
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