i switched my 4.8 ecm to my 6.0 ecm today. after i did it i had no power, the engine would crank, but no other power. i checked all the fuses and they are good. the fuses that are not supposed to have power with the key off have power, but it is very faint.
what do you guys think?
LQ4 6.0- 224/224-.560/.560-112 cam, long tube headers, flex-a-lite efans, k&n intake, throttle body spacer, msd 8.5's, e3 iridium plugs, and special thanks to Justin at Black Bear.
4L60E- "The Beast" sun gear, super hold servos, transgo shift kit, pinless accumulater piston, 5 pin planetaries.
What mod did you make? Sounds like you have open circuit voltage during your fuse test. This indicates an open ground circuit. Recheck all your grounds.
I would check all of your ground connections first. Did the motor crank over strong? Or did it sound weak?
Make sure that the alternator connections are solid, as well as the battery's positive terminal connections to the under hood fuse panel and to the harness.
2000 ECSB 6.0L
TORQUER V2 CAM ● COMP 918's ● 7.4 HARDENED PUSHRODS ● K&N SERIES 77 CAI ● 80mm BBK ●PACESETTER LT HEADERS AND 3'' ORY ● SUPER 40 FLOW ● 3000 STALL ● 4.10s ● BUILT 80e ● VORTEC PERFORMANCE TUNE ● MSD 8.5mm PLUG WIRES● ELEC. CUTOUT ● UD & ALT PULLEYS ● FLEX-A-LITE E-FANS ● 22" CENTERLINE STINGRAY III's ● LUND FIBERGLASS TONNEAU ● 2" LEVELING SHACKLES ● 12K HID LOWS & FOGS ● LEDs ● DEBADGED ● WHITE-FACED ESCALADE GAUGES ● KICKER 450.1 ● 2-CVR 10's ● DS60's ● K693's
cranks good, plenty of cranking power. all i did was change the ecm and it went crazy.
LQ4 6.0- 224/224-.560/.560-112 cam, long tube headers, flex-a-lite efans, k&n intake, throttle body spacer, msd 8.5's, e3 iridium plugs, and special thanks to Justin at Black Bear.
4L60E- "The Beast" sun gear, super hold servos, transgo shift kit, pinless accumulater piston, 5 pin planetaries.
one question is why did you use a 6.0 computer? second question is it a "tuned pcm for a 6.0" or is it a 6.0 stock computer?
2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
2002 Silverado - 427Lsx w/ Twin gt4202s
2010 Silverado crewcab Z71 - 5.3litre w/ procharger
2000 Wrangler - 5.3litre with some stance
2014 Xsport- 3.5 Eco boost
412 Motorsports
it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference
just thought it would work better, i put the 4.8 ecm back in and checked all my grounds, reconnected all of them and it fired up. ran about 10 seconds and shut off. now i no throttle response. it is a stock ecm.
LQ4 6.0- 224/224-.560/.560-112 cam, long tube headers, flex-a-lite efans, k&n intake, throttle body spacer, msd 8.5's, e3 iridium plugs, and special thanks to Justin at Black Bear.
4L60E- "The Beast" sun gear, super hold servos, transgo shift kit, pinless accumulater piston, 5 pin planetaries.
that was the problem. a 6.0 computer is setup for a 80e and or the nv4500 depending on the setup. also depending on year of the pcm you chose the program might not have the right tables. i think in 03 they changed the colors to the plugs from previous years. not mention the CAGs is probably why the truck didnt start. wrong operating system being enabled
just get your stock pcm tuned for new combo
2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
2002 Silverado - 427Lsx w/ Twin gt4202s
2010 Silverado crewcab Z71 - 5.3litre w/ procharger
2000 Wrangler - 5.3litre with some stance
2014 Xsport- 3.5 Eco boost
412 Motorsports
it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference
i was thinking that, the setup was just wrong. im going to get a custom tune.
got any ideas to the no throttle response?
LQ4 6.0- 224/224-.560/.560-112 cam, long tube headers, flex-a-lite efans, k&n intake, throttle body spacer, msd 8.5's, e3 iridium plugs, and special thanks to Justin at Black Bear.
4L60E- "The Beast" sun gear, super hold servos, transgo shift kit, pinless accumulater piston, 5 pin planetaries.
your TB hooked up? or could be in hte tune seeing that its getting more air flow compared to the stock tables of hte 4.8.
i dont like GBW for reasons like that and others
2002 Lightning - GT headed 5.5Litre w/ Twin 7665s
2002 Silverado - 427Lsx w/ Twin gt4202s
2010 Silverado crewcab Z71 - 5.3litre w/ procharger
2000 Wrangler - 5.3litre with some stance
2014 Xsport- 3.5 Eco boost
412 Motorsports
it ain't that I'm too big to listen to the rumors, It's just that I'm too damn big to pay attention to 'em..That's the difference
When you get tuning from someone that understand the voodoo inside a DBW system there is no issues getting one to run or "rev". I like mine a lot after my tune made it responsive. The DBW systems will go into reduced engine power when certain DTC's set.
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