why is my truck not firing

Elvin Reed
30

Asked by Elvin Jul 21, 2013 at 12:35 AM about the 2004 Chevrolet Silverado 1500 Ext Cab Long Bed 2WD

Question type: Maintenance & Repair

i have changed the crank and cam sensors but my truck keeps losing fire

11 Answers

tommcmanis
5,495

Year make model plz

judge_roy
Not Active

the ground connection of the 1/0 battery cable to the chassis ground should be wirebrushed clean...the battery should be younger than five years old...with the chassis ground with a reliable source (not varying amperage and voltage) your ECM has a shot at getting it right~

1 out of 1 people think this is helpful.
tommcmanis
5,495

Ok first work smart not hard scan see if any codes, or no communication no communication... be sure you have a working obd 2 port if your rig had factory security, (ie) flashing window that says security constantly, take key to dealer or quaified locksmith to test key. This truck may have a skim reader,(the key sends a signal to truck,oh ok yup you are mine ill start. If this is the case the security light will have been acting up for awile annoying flashing, stalling ,and just generally irritating. Solution replace key w proper programming recommend the dealer the reason oe parts work better and are engineered for your ride,and will give you a longer service life, you get what you pay for. Test,test,test first

1 out of 1 people think this is helpful.
tommcmanis
5,495

Hope that helps

2 out of 2 people think this is helpful.
Elvin Reed
30

the security light is not flashing. do you know what could be causing it to crank when its cold but starts to sputter and then shut off and will not crank again,seems like it loses spark.

1 out of 1 people think this is helpful.
tommcmanis
5,495

Do you have communication to ecm when no spark condition exists? Check grounds on back of the head on drivers side

3 out of 3 people think this is helpful.
tommcmanis
5,495

Wire can be broken or been pulled inside insulation cold the insulation will soften and stretch breaking connection cold it shinks making connection again

1 out of 1 people think this is helpful.
tommcmanis
5,495

Also check coil packs.

1 out of 1 people think this is helpful.
Elvin Reed
30

the coil packs are good do you know if there is a ignition module or something that could cause it to lose fire and sputter

2 out of 2 people think this is helpful.
tommcmanis
5,495

Ecm runs everything

2 out of 2 people think this is helpful.
tommcmanis
5,495

Connect obd 2 tool and see if you have communication,no communication computer is toast

2 out of 2 people think this is helpful.

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