1996 Chevy Silverado engine wont fire

Tiny
JOEJOE383
  • MEMBER
  • 1996 CHEVROLET SILVERADO
Electrical problem
1996 Chevy Silverado V8 Four Wheel Drive Automatic

i have 1996 chevolet k1500 5.7 engine I parked it during the winter and I went to start it the other day and noticed it wouldnt crank checked for fuel and it was getting fuel after checking other things I found out it wasnt firing its getting 12volts to the ignition control module and coil but there no fire going to distributor how can I check the coil or module thanx
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Monday, June 22nd, 2009 AT 11:25 AM

23 Replies

Tiny
JDL
  • EXPERT
Hello, if your saying, it cranks good but won't start and you have no spark at the plugs? You can take the coil wire loose from the cap, hold close to engine ground, have helper crank it while you watch for spark to jump from the wire to ground. If you have spark, the problem maybe the cap or rotor. If no spark, check the coil primary terminals. Pink is voltage, with the engine cranking, there should be a pulse on the white wires. If no pulse, possible problems wiring circuits--ignition module--crank sensor. You can also do an ohms test on the coil primary and secondary.

Can you check for codes? You can't check proper fuel pressure without gage.
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Monday, June 22nd, 2009 AT 12:42 PM
Tiny
JOEJOE383
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I checked the crank sensor with my voltmeter and it was okay and also I do have a fuel pressure gauge and I checked it I got 65 psi of pressure. Ill try to check coil for firing tmrw
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Monday, June 29th, 2009 AT 11:51 PM
Tiny
JOEJOE383
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Well I pulled the coil wire off the disributor cap and grounded it had friend turn the engine over and no spark so im thinking its the ignition control module
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Thursday, July 2nd, 2009 AT 10:41 AM
Tiny
JOEJOE383
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Well I had the module tested at oriellys auto parts and they said it was okay I went ahead and replaced the ignition coil and still no fire through the coil wire
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Friday, July 10th, 2009 AT 11:31 PM
Tiny
JDL
  • EXPERT
Did you check the coil primary circuits like I mentioned? Is the coil wire, ok?
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Saturday, July 11th, 2009 AT 9:43 AM
Tiny
JOEJOE383
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How do I check the coil circuits the only thing I checked was coil resistance and the 12 volt power wire to coil and module and it was getting 12 volts but ima test crank sensor and try a new coil wire today
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Saturday, July 11th, 2009 AT 9:51 AM
Tiny
JOEJOE383
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I checked the coil wire it had 330 ohms
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Saturday, July 11th, 2009 AT 10:48 AM
Tiny
JDL
  • EXPERT
The coil wire sounds ok. The white wire at the coil should have a pulse, engine cranking. If you have a digital multimeter that has a tach--duty cycle or dwell setting, it should react to a pulse.
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Saturday, July 11th, 2009 AT 12:02 PM
Tiny
JOEJOE383
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Okay I hooked my test light to the white wire and it light very lil green like a bad ground turning the engine over made no difference isnt the white wire a tach wire?
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Saturday, July 11th, 2009 AT 12:39 PM
Tiny
JDL
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Yes, It should be a dc pulse. My info shows two white wires coming from the coil. Both should have a dc pulse, engine cranking. I'd put a scanner on it that shows live engine data, crank the engine, look for an rpm signal on the scanner. Go from there.
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Saturday, July 11th, 2009 AT 2:02 PM
Tiny
JOEJOE383
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Theres a white wire then a white wire with a black stripe
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Saturday, July 11th, 2009 AT 2:52 PM
Tiny
JDL
  • EXPERT
Yes, engine cranking, both wires should have a pulse.
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Saturday, July 11th, 2009 AT 3:20 PM
Tiny
JOEJOE383
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Sry took so long to reply back but I messed with it more yesterday there isnt a pulse coming from the wires on testing the crank sensor do I test it on ac or dc and what should the voltage be?
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Friday, August 21st, 2009 AT 8:45 AM
Tiny
JDL
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Hello, refresh my memory, will you? What is the litre size of engine? Automatic-- v8?
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Friday, August 21st, 2009 AT 9:52 AM
Tiny
JOEJOE383
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5.7 (350ci) engine auto trans
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Friday, August 21st, 2009 AT 12:52 PM
Tiny
JOEJOE383
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Also on the wires with engine cranking do I probe the purple wire or yellow wire
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Friday, August 21st, 2009 AT 1:59 PM
Tiny
JDL
  • EXPERT
The crank sensor is a hall switch, three wires, pink is voltage goes hot when you turn on the key. Purple is ground. Yellow is the signal wire, with the engine cranking, a dc pulse on that wire.
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Friday, August 21st, 2009 AT 2:28 PM
Tiny
JOEJOE383
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Kk well I replaced the cranksensor and still no fire I checked the white wire coming from ignition module and I got no pulse
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Friday, August 21st, 2009 AT 8:27 PM
Tiny
JDL
  • EXPERT
The white wire doesn't come from the coil driver, it goes to the coil driver from the pcm. I'm not saying the pcm is faulty. Did you check the wiring circuits at the crank sensor?
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Saturday, August 22nd, 2009 AT 8:03 AM
Tiny
JOEJOE383
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Where does the crank sensor wires go and how can I test the wires the only way I checked them was with a test light and the power wire was good. Could the ecm cause it not to fire? Cause im kinda worried it could be it cause last time I drove it the cable from the battery to fuse box was loose and it was acting up.
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Saturday, August 22nd, 2009 AT 8:59 AM

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