Tuning for 4.88 gears
Thread Starter
Teching In
Joined: Jul 2007
Posts: 18
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From: Northern NJ
Tuning for 4.88 gears I know this isn't the right forum, but my programmer is at a dead end and is getting no help from the folks at EFi Live either. 
Basically I have an '07 Silverado with the 5.3L engine. It's lifted around 9 inches, has 35" mud tires and I switched to 4.88's (from the stock 3.73's). My issue is, the guys at East Coast Supercharging gave the truck a 93 octane EFi Live street tune(was told it's similar to HPT), but they can't figure out how to get the speedo correct (due to the larger diameter tires) and keep the ABS and Emergency brake lights from coming on (caused by the gears, Jeff Z informed me a scan revealed an eror C0245 wheel speed sensor frequency error), apparently EFI Live has no clue either. It's NOT a bad speed sensor, all my friends with lifted trucks are having the same issues. The truck drives great with the new paramaters which were forced, but those two issues I mentioned still exist and they're quite annoying to deal with and accept on a brand new truck. I was told by the Jeff Zacher at The Trans Shoppe in Livingston if anyone had any answers, or could steer me in the right direction it would be Ken Kelly. Of course if anyone else has any ideas, clues, anything at this point, I would be quite grateful.
Basically I have an '07 Silverado with the 5.3L engine. It's lifted around 9 inches, has 35" mud tires and I switched to 4.88's (from the stock 3.73's). My issue is, the guys at East Coast Supercharging gave the truck a 93 octane EFi Live street tune(was told it's similar to HPT), but they can't figure out how to get the speedo correct (due to the larger diameter tires) and keep the ABS and Emergency brake lights from coming on (caused by the gears, Jeff Z informed me a scan revealed an eror C0245 wheel speed sensor frequency error), apparently EFI Live has no clue either. It's NOT a bad speed sensor, all my friends with lifted trucks are having the same issues. The truck drives great with the new paramaters which were forced, but those two issues I mentioned still exist and they're quite annoying to deal with and accept on a brand new truck. I was told by the Jeff Zacher at The Trans Shoppe in Livingston if anyone had any answers, or could steer me in the right direction it would be Ken Kelly. Of course if anyone else has any ideas, clues, anything at this point, I would be quite grateful.
Last edited by AllBlkdOut07; Jun 17, 2009 at 04:49 PM.
Teching In
Joined: Oct 2007
Posts: 34
Likes: 0
From: Mount Airy, MD
Remember that on a modern vehicle, that if you change a setting in the pcm, you might affect another diagnostic setting in say the ABS module. Thats the "beauty" of CAN. Its basically a multiplex system for vehicular control. The pcm was set for the tire and gear change, however at an expected speed, say 30 mph, a generated pulse, by the VSS, the PCM reports to the CAN network XX pulses. The ABS computer is looking for a specific range of frequency generated by the wheel speed sensors,and if they do not correllate then you get a code. Maybe you could have the frequency lowered by someone with a tech 2 scanner.
HTH
Chris
HTH
Chris
