92 GMC Sierra LS1 swap

[P.O.D._dyno&tune]

Got this truck last week. Another shop did the swap and tune. When we got it, it had 100lb. of fuel pressure! Wouldn't run but we fixed that. Now the problems we have are speedo way off, won't idle down past 950rpm, and can't adjust afr. It goes rich to lean back to super rich. In the middle of WOT ltft's are kick in and duty cycle is droping. ANY HELP WOULD BE GREAT! The last shop had it for a year while the owner was in Iraq. Now he's back and would like to have it.

[sssalah]

For the high idle maybe there is an air leek somewhere, or the throatle blade is opened too much by the adjustment screw. Check the IAC and it should be zero.
Log is short, but one issue is that it goes to PE (open loop) when TPS goes high as it should for 1 sec only than go back to closed loop for 9 seconds whicle the TPS is at 100% which doesn't make sence.

[Cantalope Kid]

Call Allen Nelson @ 210-626-0278

[P.O.D._dyno&tune]

Call Allen Nelson @ 210-626-0278

Who is this Allen Nelson (is he at a shop?) and are you sure he would be willing to help?

[Cantalope Kid]

Who is this Allen Nelson (is he at a shop?) and are you sure he would be willing to help?

He is the truck god. He owns Nelson Performance in San Antonio,TX. Also owns www.ls1truck.com!

[Cantalope Kid]

List of modifications to vehicle?

[waynehartwig]

What's up on the speedo page? Specifically general and tire.

On the tire size page, it says your calculated tire size is 96.17", but it should be 26.91".
On the general page, all of the VSS and pulses are way off, probably due to the above. Also it's set for a 17 pulse VSS, is that correct?

[P.O.D._dyno&tune]

List of modifications to vehicle?

No modifcations. The engine is out of a 01 vette. The other shop had an ecu flashed to a 99 camaro. The truck is an automatic but it think the ecu is flashed for a manual. Don't know what kind of MAF(not a vette), it's a 3 wire. The original 4l60e was smoked so the owner put a 700r4 in it and it slips going into drive. What kind of trans would you all suggest?

[loppad]

What's up on the speedo page? Specifically general and tire.

On the tire size page, it says your calculated tire size is 96.17", but it should be 26.91".
On the general page, all of the VSS and pulses are way off, probably due to the above. Also it's set for a 17 pulse VSS, is that correct?

It's not that bad, you can read "Tire Size, Current: 28" and "Calculated Tire: 96.17"
A stock calibration is "Tire Size, Current: 24.94" "Calculated: 85.66"

Actually I changed back to stock Tire Size to 24.94 and Gear Ratio to 3.42 and clicked on "Commit" for Auto Scale and all tranny tables went back to stock.

[loppad]

I compared your calibration to a 1999 camaro/firebird stock file and I only found 47 differences (36 if you change back to stock tire size and gear ratio).

Then I compared to a 2001 corvette stock and found 230 differences.

ECUs might be the same but they are not controlling the same engine-transmission. I believe you need the original calibration for that engine and then check for normal operation.

If the transmission is different that the stock one you’ll probably need a segment swap: in the same calibration file a tranny guru (check tranny section of this forum) replaces the transmission information for your particular hardware.

[Google]

The picture I posted shows your calibration details as a 1999 5.7L T56.

#1. What year 700R4 are you using?
#2. Are you using 28" tires?
#3. Are you using 4.56:1 gears?

Would not be hard to fix the speedo problem.

[Google]

Problem #1, See pic.