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gmc 4.3 no spark need help

231 Views 11 Replies Latest reply: 2024-02-13 19:11:39

Level 2
(23) points

2024-02-12 17:24:36

Gmc Sierra 4.3 no spark.. Changed crank sensor can sensor ICM and coil. Has all good grounds. Not getting the 5v wave

Tags: gmc , 4.3 , no , spark

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Level 9
(3774) points

2024-02-12 19:51:41 (Reply to:)

Hi, have you change the ignition module,than check the ecm connector or ecm itself
,check fuses .

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Level 2
(23) points

2024-02-12 20:14:38 (Reply to:)

Yes changed the ic twice and installed a new pcm well a used one but programmed it
bypasses the security system and checked all fuses . tested every wire in main
harness to make sure we had no broken wires. Where I'm at now is the cranksensor is
only getting 10 volts

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Level 9
(3774) points

2024-02-12 20:24:56 (Reply to:)

How is the condition of the battery,check the negative from battery to engine and to
body, what is the model year of the car?

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Level 2
(23) points

2024-02-12 20:53:20 (Reply to:)

Its a 2007 sierra 1500 2wd auto

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Level 2
(23) points

2024-02-12 20:54:08 (Reply to:)

Battery is good we swapped out with one from shop

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Level 9
(3774) points

2024-02-12 20:56:16 (Reply to:)

Hi, also check the ground under the left exhaust manifold and put on a new ground
cable.its important to check this.

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Level 2
(23) points

2024-02-12 21:00:34 (Reply to:)

Hold on let me check,,, drivers side

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Level 2
(23) points

2024-02-12 21:01:35 (Reply to:)

Whete under the manifold I don't see a ground u der either

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Level 2
(23) points

2024-02-12 21:02:11 (Reply to:)

Got a number me and another tech will call ureal fast if possible

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