No spark in 2004 Chevy Silverado 1500

20

Asked by Jul 17, 2016 at 07:13 PM about the 2004 Chevrolet Silverado 1500 LB 4WD

Question type: General

My truck just quit running...had to be towed to the shop. Diagnosis is no
spark. Replaced the coil, distributor cap, rotor, crank sensor and ignition
module and still nothing.  Engine is getting plenty of fuel but won't fire. If
anyone has any suggestions, I'm ready for anything as it's been over 2 weeks
without my truck.

20 Answers

23,160

Check for blown engine fuse in fuse box under hood. And also did you replace the camshaft sensor ?

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20

The fuse check is next....camshaft sensor then ECM. I had the fuel pump replaced about a week before the truck just quit, for the same symptoms. It ran fine for that week, then just died again.

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23,160

Will it start if you spray some carb or throttle body cleaner into throttle ?

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20

There's no spark from the wires/plugs...won't start no matter what they try

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23,160

No check engine light ?

20

Nope....it just died without warning. What ever happened to real vehicles? Change the points, plugs, rotor, distributor cap and you were good to go; worst case scenario was a starter.

23,160

They are just trying to get us to take vehicle to the dealer to get it worked on.

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23,160

Have your vehicle scanned any way for codes because if the check engine light was on at one time and now it is off it still stores the code in it's memory.

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20

The check engine light didn't come on.....if the truck won't run, can they scan it anyway to diagnose the problem? Also, can I take it to a Ford dealer ((half a mile tow), or do I need to have it towed to a Chevy dealer (30 miles away)?

23,160

You maybe able to rent the scan tool from the local parts store like auto zone I no they rent tools may be able to rent scan tool also.

1 people found this helpful.
20

I'm gonna call the shop where the truck is and see if they have already scanned it...if not, I'm off to Auto Zone or Napa. Thanks so much for your help!! Just curious....is there any test to find out if the ECM is bad?

23,160

The check engine light scan should tell you everything you need to no.

20

Can you run a check engine light scan without the vehicle running?

23,160

Always do the scan with the vehicle off.

20

Okay...spoke with the mechanic that's been working on the truck. He scanned it 1st thing, and no codes came up. He has checked/replaced everything and still no spark. The distributor cap turns inside when cranking the engine, but no spark. The only thing that hasn't been replaced is the ECM. Any thoughts?? Thanks!

23,160

I no this is not going to make any sense to you since vehicle is spinning over good but install a new battery then try and start. About 39 years ago when I was a teenager had a 69 firebird one day would not start turned over good and strong but would not start found out just like you had no spark tried everything so out of curiosity replaced with a new battery and she fired right up still to this day do not understand why but it did. Not saying this is your problem but hey give it a try. It might surprise you.

20

Rather than spend $$ on a new battery (it's only a year old)...can I try jumping it to see if (hopefully) that's the problem?

23,160

Does not have to be a new battery but a battery that you know will start another vehicle or just try recharging that battery and yeah give that a try jumping vehicle at this point I know you are willing to try anything.

20

I'll stop by the shop tomorrow and tell Charlie to give it a try...he's as frustrated as I am over this...he always says" Ain't nothin' I can't fix"....I'll keep you posted...and thanks!

20

Well, the saga continues....replaced the ECM (pre-programmed) and STILL no spark; that was after jumping it, which didn't work either. Today he's going after the wire harness which is off the crank sensor, looking for chafing or cracks. If you can think of anything else it could be, please let me know. Thanks

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