why is my truck not firing

Elvin Reed
80

Asked by 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

16 Answers

tommcmanis
6,685

Year make model plz

3 out of 3 people think this is helpful.

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~

3 out of 3 people think this is helpful.
tommcmanis
6,685

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
6,685

Hope that helps

2 out of 2 people think this is helpful.
Elvin Reed
80

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.

4 out of 4 people think this is helpful.
tommcmanis
6,685

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

4 out of 4 people think this is helpful.
tommcmanis
6,685

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
6,685

Also check coil packs.

1 out of 1 people think this is helpful.
Elvin Reed
80

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

4 out of 4 people think this is helpful.
tommcmanis
6,685

Ecm runs everything

2 out of 2 people think this is helpful.
tommcmanis
6,685

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

4 out of 4 people think this is helpful.
SamanthaTjs GurlLittle
50

I have a GMC Sierra 1500 5.0 1995 and it will turn over but won't crank it's getting fire to the coil got me spark plugs and fuel filter what else could cause it not to get fire to the distributor or not crank?!?

5 out of 5 people think this is helpful.
SamanthaTjs GurlLittle
50

New spark plugs and fuel filter**

Timothy Nelms
50

Having same problem 05 Silverado 4.3 sputters when mouister in air or raining then just stopped firing completely any help would be great

5 out of 5 people think this is helpful.
gg1996impalass
0

My 96 4.3 was not starting when humid or raining outside took for ever to start and when it finally did i popped the hood while it was still dark out 5:30 goint to work and heard a ticking noise as if a spark plug wire was disconnected. Then tracked it down to the ignition coil it was sparking all over the place went bought a new one and never had that problen again

tommcmanis
6,685

On an external coil pack,the coil wire post will make oxidation if aluminum/green if brass clean w a mild sandpaper,replace coil wire and use DIELECTRIC grease to prevent moisture and reoccurring issue I moist climates.

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