4.8 to 6.0 swap crank no start!
#1
4.8 to 6.0 swap crank no start!
Hey guys, so over the weekend I swapped my 4.8 out for a 6.0, I had the computer tuned and put all new sensors and everything on the 6.0 along with some other upgrades such as cam and tbss intake. I go to start it and all it does it crank, no starting, no sputtering, nothing. I swapped the new crank sensor out for the old one that I know works. I have spark, I have fuel in the rails, but after I crank it for a while there is no fuel on any plugs, that makes me think the injectors aren’t firing at all but I’m completely stumped. Tripled checked every connection and grounds. Anyone have any suggestions?
#3
yeah the computer did cross my mind. I don’t thinks it’s the VATS because like you said, it won’t even kick on for a second and then die like the vats system does. I am going to call the tuner tomorrow and go through it with him to double check. It’s in a 2000 Sierra 1500, it’s just a lq9 with stock 243 heads. A tsp 228/232 @.600 lift, and a tbss intake.
#5
I did keep the factory map sensor, swapped it from the original intake to the new one. MAF sensor has been untouched. It is a knock-off throttle body of the Holley 92mm
#6
Custm2500's Rude Friend
iTrader: (17)
An LQ9 with 243 heads has alot more compression than a 4.8L. That intake and throttle body flow alot more air than the stock unit ever did.
If the Tune File Does not have the correct values for all the changes you made, It may not want to start.
Discuss with your tuner and let us know.
If the Tune File Does not have the correct values for all the changes you made, It may not want to start.
Discuss with your tuner and let us know.
The following users liked this post:
darkirish63 (07-31-2020)
#7
An LQ9 with 243 heads has alot more compression than a 4.8L. That intake and throttle body flow alot more air than the stock unit ever did.
If the Tune File Does not have the correct values for all the changes you made, It may not want to start.
Discuss with your tuner and let us know.
If the Tune File Does not have the correct values for all the changes you made, It may not want to start.
Discuss with your tuner and let us know.
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