Will this work on a 1989 c1500 2wd lq4 6.0 4l60e swap. My speedo don't workOriginally Posted by HPICamaroSS
Will this work on a 1989 c1500 2wd lq4 6.0 4l60e swap. My speedo don't work
Took the truck to the sand dunes over Memorial weekend.....http://www.youtube.com/watch?v=_UTr3...youtu.be....It did SOOO much better than my old tbi motor. I have only had a few problems so far. When I filled the truck up the fuel guage got stuck at full. So i dropped the tank and found out that the walbro 255 that i put in along with the conversion harness caused the float to get stuck at the top. a few zip ties solved that problem. If you go with the same fuel setup that I did, make sure u zip tie that extra long harness to the lines inside the tank. In the dunes i know my driveshaft was hitting my transfercase when the suspension would preload, so I am going to have it shortened 2". Called my local driveline shop and they said they would do it for 60 bucks. Another problem is my speedo not working in 4wd. Im guessing its the vss?
Silverado Z71 10" Lift COMPLETE 6.0/4L80E PRC 2.5 Ported LS6 Heads 228r Comp Cam 3200 CIRCLE D Stall LS7 Lifters ARP Bolts SLP Oil Pump and Double Timing Chain 160 T-Stat 3" SLP Loudmouth Electric Cutout Walbro 255 Pacesetter Longtubes MSD Starter NELSON Harmess NELSON Street/Strip Tuned ECM MSD Wires LS1 Throttle Body Braided Lines Spectre CAI 4.56 Gears Detroit Locker 14 bolt http://www.ls1truck.com/forums/lsx-t...wap-build.html
Hey everyone, I need some help getting my tach working the right way. I have nelsons tune and harness, and I have their tach wire hooked up to my white wire behind the glove box. I have my stock cluster, and a autometer tach and they both work, BUT they both read really low. At idle its at 0RPMs, and when I floor it the highest it will go is about 1500RPMS and I know I am way higher than that.
I called Nelson a few days ago and ray said try switching the autometer to the "4cyl pulse mode". So I did that, and that made the autometer tach read really high. It is reading at 1500 RPMS at idle and the needle is shakey. The stock cluster did not change: It still reads low.
IDEAS?
On another note, having my driveshaft shortened 2" tomorrow :-)
Silverado Z71 10" Lift COMPLETE 6.0/4L80E PRC 2.5 Ported LS6 Heads 228r Comp Cam 3200 CIRCLE D Stall LS7 Lifters ARP Bolts SLP Oil Pump and Double Timing Chain 160 T-Stat 3" SLP Loudmouth Electric Cutout Walbro 255 Pacesetter Longtubes MSD Starter NELSON Harmess NELSON Street/Strip Tuned ECM MSD Wires LS1 Throttle Body Braided Lines Spectre CAI 4.56 Gears Detroit Locker 14 bolt http://www.ls1truck.com/forums/lsx-t...wap-build.html
Sounds to me like you're trying to use vehicle speed for tach signal.
Try this.http://www.lt1swap.com/lsx_tach.htm
Please give a feedback if it work. I will need to wire mine to in the future.
Sorry for my bad English I'm french!
I am sending my ecm back into Nelson and they are going to try and recalibrate it first. I will let you guys know how it works
Silverado Z71 10" Lift COMPLETE 6.0/4L80E PRC 2.5 Ported LS6 Heads 228r Comp Cam 3200 CIRCLE D Stall LS7 Lifters ARP Bolts SLP Oil Pump and Double Timing Chain 160 T-Stat 3" SLP Loudmouth Electric Cutout Walbro 255 Pacesetter Longtubes MSD Starter NELSON Harmess NELSON Street/Strip Tuned ECM MSD Wires LS1 Throttle Body Braided Lines Spectre CAI 4.56 Gears Detroit Locker 14 bolt http://www.ls1truck.com/forums/lsx-t...wap-build.html
Im pretty sure the tach wire (on the obs) is the white wire. Unless I have the wrong white wire
Silverado Z71 10" Lift COMPLETE 6.0/4L80E PRC 2.5 Ported LS6 Heads 228r Comp Cam 3200 CIRCLE D Stall LS7 Lifters ARP Bolts SLP Oil Pump and Double Timing Chain 160 T-Stat 3" SLP Loudmouth Electric Cutout Walbro 255 Pacesetter Longtubes MSD Starter NELSON Harmess NELSON Street/Strip Tuned ECM MSD Wires LS1 Throttle Body Braided Lines Spectre CAI 4.56 Gears Detroit Locker 14 bolt http://www.ls1truck.com/forums/lsx-t...wap-build.html
Sounds like you need a resistor inline with the tach module. There is one year of pcm that has a very weak signal to the tach. Do you know what year your tune is from? Is it dbw?
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
I have no idea what year the pcm was but I just sent it back to nelson and they already have a new one for me on the way. They changed the pulse cycle to see if that helps. Once I get it I will let you know. Hopefully its right because if its not then I will have to send it back again, and have them change it back to where it originally was, then try putting that resistor in. I want to say that tune was from a 2002 because I recall them saying those were the easiest to tune. I know it was a 0411 ecm.
Silverado Z71 10" Lift COMPLETE 6.0/4L80E PRC 2.5 Ported LS6 Heads 228r Comp Cam 3200 CIRCLE D Stall LS7 Lifters ARP Bolts SLP Oil Pump and Double Timing Chain 160 T-Stat 3" SLP Loudmouth Electric Cutout Walbro 255 Pacesetter Longtubes MSD Starter NELSON Harmess NELSON Street/Strip Tuned ECM MSD Wires LS1 Throttle Body Braided Lines Spectre CAI 4.56 Gears Detroit Locker 14 bolt http://www.ls1truck.com/forums/lsx-t...wap-build.html
Computers used were 09354896 from 99-00, and 12200411 from 01-02
I meant that you were possibly supplying the tach with vehicle speed info.
Last edited by Wagonbacker9; 06-12-2012 at 11:42 PM.
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