98 hd 3500 454 no start but fires

i have a rollback that the wire harness burnt up last week , i rewired the burnt area and changed the crank and cam senors and she fired right up, ran the best ever one cold morning she started great made it to the end of the driveway heard a pop and she quick, go mad and tried to fix more burnt wires but no start, i order a new harness from chevy 650 installed her but no start it sounded out of time i changed the cam senor again tested for spark yes but still no start it has fuel but it seems only half the injectors are working, i don't have a fuel pressure gage but it seems to fire but not start, can anyone help......thanks mike

Reply to
kucharskiauto
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burnt area and changed the crank and cam senors and she fired right up, ran the best ever one cold morning she started great made it to the end of the driveway heard a pop and she quick, go mad and tried to fix more burnt wires but no start, i order a new harness from chevy 650 installed her but no start it sounded out of time i changed the cam senor again tested for spark yes but still no start it has fuel but it seems only half the injectors are working, i don't have a fuel pressure gage but it seems to fire but not start, can anyone help......thanks mike

Huh?

Reply to
Bob M

try the computer...had one go out... drove me nuts for a mouth

Reply to
R G

the burnt area and changed the crank and cam senors and she fired right up, ran the best ever one cold morning she started great made it to the end of the driveway heard a pop and she quick, go mad and tried to fix more burnt wires but no start, i order a new harness from chevy 650 installed her but no start it sounded out of time i changed the cam senor again tested for spark yes but still no start it has fuel but it seems only half the injectors are working, i don't have a fuel pressure gage but it seems to fire but not start, can anyone help......thanks mike

Gee its not that hard to figure out. He has a one ton with a roll back meaning he probably has a flatbed wrecker. The wiring harness burnt and he repaired the damaged section, replaced some sensors, It ran great. A while later on a cold morning it quit at the end of the driveway and more burnt harness was found. Owner now ordered complete harness from gm, $650 worth, and installed it, Now it cranks but wont start..

Will the truck start and run for a bit if a small amount of gas is squirted into the intake?

The list of possible problems is large. But all start with the same question, what caused the wiring harness to smoke? Injectors could be messed up if their wiring shorted out to higher voltage then they were designed to handle. Same with the fuel pump. Computer could have gotten cooked(most likely did get cooked, but there could still be other issues as well). If the cause of the short was not chaffed wiring, then what ever caused it could still exist and cause another smoked harness.

Whitelightning

Reply to
Whitelightning

Best make positively sure the wiring is good first, or the new ECM will cook too. But yes, burnt ecm wiring is a VERY good sign the ECM is burnt too.

Reply to
Shoe Salesman

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