Replying to Thread:

3126 cat 1998 gmc crank but no start help,help help

Created On Saturday 2, May, 2015 4:21 PM by gaskincrew

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[q]If you turn on the key and the check engine and stop engine lights come on briefly then you know the ECM is powering up then use a low voltage detector on the injector wires going up in to the valve cover. It should detect voltage when cranking. Another option is to pull the valve cover and use a meter on the injector wires to check for voltage. If you have no voltage when cranking the ECM is not seeing engine speed. Check speed sensors. If you have voltage most likely not getting fuel.[/q]

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gaskincrew

Posts: 1
Joined: May 2015

Saturday May 02, 2015 16:21

got a problem , drove to my shop shut off and now only will start up on ether and will go back dead, checked high pressure oil pressure ok, check fuel pressure ok, I have checked powers and grounds to computer all is there and ok, I can go to the high pressure pump and check voltage on the 2 wire connector upluged and can key on and then start and I have no voltage at any time, I think it should be 5-9 volts but have nothing, the engine light not coming on in dash so can pull any codes, any diag would be greatly helpful , im losing money every day, thanks ahead of time for any suggestions, I think may be ecm

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chris

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TDcrash63

Posts: 163
Joined: Sep 2007

Saturday June 20, 2015 14:25

If you turn on the key and the check engine and stop engine lights come on briefly then you know the ECM is powering up then use a low voltage detector on the injector wires going up in to the valve cover. It should detect voltage when cranking. Another option is to pull the valve cover and use a meter on the injector wires to check for voltage. If you have no voltage when cranking the ECM is not seeing engine speed. Check speed sensors. If you have voltage most likely not getting fuel.

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3126 cat 1998 gmc crank but no start help,help help

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