5.3 help with acceleration

[beto101]

Did engine swap in blazer. I went with the dbw set up. It idles like it should and in park revs up fine. The problem is when i put it in gear. It accelerates rough like it wants to bog out. Hooked up code scanner and no codes. Any ideas?

 

[buefchris]

I'd try calling Street and Performance.
They really know those LS's and can help you out. http://www.hotrodlane.cc/

 

[supersize75k5]

If you just hooked it up and no codes you may need a few more starts to set one.


Did the pedal and tac come from the same truck as the motor and throttle body? There were a couple versions of them and people have had issues.

few basics for a check list..


-good ground to the frame from the motor?
-power at the data port?

 

[supersize75k5]

Almost forgot the basics, you need to put a fuel pressure gauge on the fuel rail and start there. I believe gm calls for 58 psi or right around there.


I had a brain fart when I swapped to AN lines and a corvette filter regulator and got my lines mixed up.. "both 6 AN" .. checked the fuel pressure on the rail and worked my way to the brain fart.


Also have dealt with a crimped/crushed line, truck ran fine till in gear.


What pump/sender set up are you running?