truck has no pulse at the injector - Diesel Truck Forum -
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post #1 of 3 (permalink) Old 02-25-2010, 03:15 AM Thread Starter
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truck has no pulse at the injector

I have just finished switching my engine (04 lb7) as the old 1 had a head gasket leaking or possble cracked head. I found an 01 lb7 with only 2000 miles on it (yeah rite) it does look fairly new so i figure maybe 25,000,anyways it was only a long block so we switched all the sensors and wiring except the cam sensor and crank sensor.By the way the new motor came with injectors already in it.A friend of mine the works at a gm dealer came over and checked a few things and he said there is power at the fuel ecm on the pink wires but there is nothing comeing out.we checked continuity on all the wires and he came to the decision that the bosch fuel ecm was bad.I called a friend and he drove his 03 over and i tried my ecm on his truck and it fired rite up and ran like a champ.

Any help or ideas are welcome please
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post #2 of 3 (permalink) Old 02-27-2010, 04:30 AM Thread Starter
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wow cant believe no coments!!!
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post #3 of 3 (permalink) Old 02-27-2010, 05:14 PM
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Whats your press while cranking? Injectors wont attempt to fire under 12k psi. If your loaded with air, it wont attempt to fire.

01 Chevy CC/SB 4WD. Not Quite Stock.

Last edited by vrabel; 02-27-2010 at 05:16 PM.
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