No MPH

[Jim Nolan]

Are the LT1 and the LT5 Vehivle speed sensor the same? Are they readily available? The Vet has been sitting for about 2 month so I decided to take it out for a drive today. No MPH, no mpg and service engine lite evently came on on the way home. It set a code 24 (vehicle speed sensor). I checked online with out satisfactory results. Do you know if the chevy dealers still carry them?

Jim

[WVZR-1]

Originally Posted by Jim Nolan

Are the LT1 and the LT5 Vehivle speed sensor the same? Are they readily available? The Vet has been sitting for about 2 month so I decided to take it out for a drive today. No MPH, no mpg and service engine lite evently came on on the way home. It set a code 24 (vehicle speed sensor). I checked online with out satisfactory results. Do you know if the chevy dealers still carry them?

Jim

The most likely issue is the connection at the VSS. There are actually two style of VSS, '90 is one and '91+ are another. The '90 is not available any longer and hasn't been. If your car is a '91+ you'll have no difficulties at the local auto parts store. You mentioned LT1 & LT5 in the same sentence so that would "hint" that your car is a '92 or newer.

Don't assume anything. Do the diagnostics.

[-=Jeff=-]

but you can use the 91 sensor on a 90 if you splice the connector..

Right WV?

[WVZR-1]

Originally Posted by -=Jeff=-

but you can use the 91 sensor on a 90 if you splice the connector..

Right WV?

I have never done it but I've always assumed yes it would. I believe it might be more practical to maybe fabricate a short harness/adapter from the weather-pack style to the appropriate connector vs. a cut splice. There's of course nothing wrong with an appropriate proper splice.

[XfireZ51]

The wiring should be the same since the ZR-1 ECM works with any model year LT-5. You could likely buy the 91 harness connector and swap the wiring from the 90 to the 91 connector.

[WVZR-1]

I believe the conversation regarding the '90 doesn't relate to the OP. Last year I believe he mentioned an ASR/FX3 issue and his car is a '92. He also mentioned in a "closing post" to the thread that his MPH/ODO correction was done with an ERA when he did a rear ratio change. I mentioned in my first post in this thread. Diagnostics.

I'd say the OP has much to check out. Several splices etc. I doubt a VSS issue.

His last post in the other thread:

http://www.zr1.net/forum/showpost.ph...5&postcount=22

[WVZR-1]

Originally Posted by XfireZ51

The wiring should be the same since the ZR-1 ECM works with any model year LT-5. You could likely buy the 91 harness connector and swap the wiring from the 90 to the 91 connector.

Originally Posted by -=Jeff=-

but you can use the 91 sensor on a 90 if you splice the connector..

Right WV?

I used a '92 FSM (6E3-A-54 Code 24) and a '90 FSM (6E3-A-46 Code 24) and comparing the ECM inputs A6 & A11 they are reversed at the VSS. A '90 is pinned YELLOW to B/PPL to A, a '92 and I assume a '91 are reversed at the VSS with YELLOW to A/PPL to B so when the connector is spliced or using a harness extension like I mentioned you need to make sure you pin/splice it appropriately. That is why I initially mentioned a harness extension but I didn't recall the specifics of why. Doing it with the harness extension if you wanted to go back to an OE VSS it's simply "plug and play" rather than another cut/splice.

I assume the FSM's mentioned are correct!

[Jim Nolan]

Originally Posted by WVZR-1

The most likely issue is the connection at the VSS. There are actually two style of VSS, '90 is one and '91+ are another. The '90 is not available any longer and hasn't been. If your car is a '91+ you'll have no difficulties at the local auto parts store. You mentioned LT1 & LT5 in the same sentence so that would "hint" that your car is a '92 or newer.

Don't assume anything. Do the diagnostics.

Yes, it is a '92. If the VSS is readily available for a '92 I would rather buy one than adapting one from a '90.

Thanks