2005 Chevy Silverado fuel injector problems

kdog05 · Posted at Tue Nov 03, 2009 5:50 pm

Engine Performance problem
2005 Chevy Silverado V8 Four Wheel Drive Automatic 65000 miles

About a month ago while driving on the freeway the engine light came on, and engine started to act funny. If i tried to give it gas to quickly it wouldn't respond, but if i did it slowly ti did ok. Eventually after about two days of driving it carefully the engine started to run better, and the engine light went off. Since then i have had the engine light come on several times and get progressivly worse, and have noticed it that the light tends to come on if i hot rod it a little, then same thing happens a couple days later of taking it easy the light goes off. I did have a chip on it and thought that was causing it so i unhooked it, and about three days later i was driving normall and the light came on then the truck had no throttle response and sounds like its knocking realy hard it only idles and if you give it gas it has no response. I got a tester and it came up with three codes:
1: Fuel pump relay circuit malfunction injectors
2,3,5,8.
2: Fuel rail pressure range/perfromance
3: fuel injector 2 control circuit malfunction
I replaced the fuel pump relay under the hood fuse block and the engine still runs poorly. while the motor is running and i pull off the electrical connector on cylinders 2, 3, 5, and 8 one at a time nothing happens
if i pull off cylinder 1, 4, 6, or 7 one at a time the motor dies the second i pull it off. (not sure what this meens but tried it anyways). I don't think it's the injectors and the rely is fine any suggestions would be appreciated

jdl123 · Posted at Wed Nov 04, 2009 10:20 am

Welcome to the forum, Voltage to injector is pink wire, goes hot when you turn on the key. The other wire whatever the color is ground. You can use a noid lite on injector plug, engine cranking, the lite should pulse.

kdog05 · Posted at Wed Nov 04, 2009 4:54 pm

I have tested each injector wire with a noid lite with key in the on position or while motor is running i have no voltage present on any wire what does this mean?

jdl123 · Posted at Thu Nov 05, 2009 6:23 am

Did you use a testlite on the pink wire to check for voltage. Ground the testlite to the engine block. If no voltage, there is an injector fuse for each bank.

kdog05 · Posted at Fri Nov 13, 2009 5:14 pm

I finally fixed the problem apparently 0n the 05 duramax it is a common problem for the injector harnesses to go bad on cylinders 2 and 7. The dealer sells a kit with new harnesses and some heat shrink butt splices for $250 it took me 30 min to change out harnesses, and the truck runs perfect. Thanks.

jdl123 · Posted at Sat Nov 14, 2009 6:19 am

Glad you got it going your way.