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Engine not running for me?

Tiny
TIGERMIKE28
  • MEMBER
  • 1998 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 230,000 MILES
Replaced some parts including, fuel pump, fuel filter, spider injectors, and spark plugs. I had fire before, but no fire now. Engine will turn over, but will not start.
Tuesday, June 11th, 2019 AT 5:53 AM

16 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

When you crank the engine, does the tachometer move up a little showing cranking RPM?

Did the engine run prior to all the repairs?

That will tell me if the crank sensor is working.

https://www.2carpros.com/articles/car-cranks-but-wont-start

Roy
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Tuesday, June 11th, 2019 AT 6:09 AM
Tiny
TIGERMIKE28
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  • 9 POSTS
The rpm's quit working shortly after I got brake work done a month ago. The truck wouldn't start one day, so I started troubleshooting. It had spark before I did the repairs.
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Tuesday, June 11th, 2019 AT 9:51 AM
Tiny
ASEMASTER6371
  • MECHANIC
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My first suspect would be the crank sensor. Very easy to access and inexpensive.

https://www.2carpros.com/articles/crankshaft-angle-sensor-replacement

Roy
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Tuesday, June 11th, 2019 AT 9:57 AM
Tiny
TIGERMIKE28
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The crank sensor didn't help.
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Tuesday, June 11th, 2019 AT 1:36 PM
Tiny
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Okay, did you check the cap and rotor on the distributor? Make sure the rotor does not have a hole burned through it.

Check for power to the positive side of the coil with the key on.

Roy
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Tuesday, June 11th, 2019 AT 1:57 PM
Tiny
TIGERMIKE28
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I have voltage to the coil with the key on, but not sure about the signal wire which I think is the middle wire. No spark coming out of the coil to the distributer.
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Tuesday, June 11th, 2019 AT 3:39 PM
Tiny
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Okay, use a test light on the white/black wire on the coil. Crank the engine and see if it flashes while cranking. That will tell me if the module is working.

Roy
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Tuesday, June 11th, 2019 AT 4:02 PM
Tiny
TIGERMIKE28
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Okay.
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Tuesday, June 11th, 2019 AT 4:03 PM
Tiny
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Keep me updated.

Roy
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Tuesday, June 11th, 2019 AT 4:06 PM
Tiny
TIGERMIKE28
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I couldn't find a test light, so I used my fluke 87 multi-meter. I tested the pink wire from the coil connector with key off = ground, key on = 12v. I tested the other two wires 0v, neither have continuity to ground, 0v when attempted to start. That confused me. This was done with the connector removed from the coil. Might I have done that wrong? I couldn't get a reading with it connected to the coil as I didn't have a t pin.
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Tuesday, June 11th, 2019 AT 4:47 PM
Tiny
TIGERMIKE28
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I should be able to do a continuity check to the ECM right? Or is there a problem with the ECM? I thought the pink wire was line voltage, the other outside wire was ground, and the middle wire was the signal wire.
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Tuesday, June 11th, 2019 AT 4:54 PM
Tiny
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No, you cannot use a voltmeter for this test.

You need a test light. Doing a continuity test is not a test yet.

You need power to the negative side of the coil. If you have no voltage with the key on, you need a coil.

Roy
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Tuesday, June 11th, 2019 AT 4:58 PM
Tiny
TIGERMIKE28
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I tested with an automotive test light. All three wires light up green with ignition off. All three light up red with ignition on. None flash when cranking.
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Wednesday, June 12th, 2019 AT 8:14 AM
Tiny
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The module is not working.

I would replace the module.

I attached a picture for you. It is number 7 in the picture.

Roy
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Wednesday, June 12th, 2019 AT 8:29 AM
Tiny
TIGERMIKE28
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That did it. With a fuel line patch it's up and running. Thanks very much Roy!
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Wednesday, June 12th, 2019 AT 3:17 PM
Tiny
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You are welcome.

Always glad to help.

Roy
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Wednesday, June 12th, 2019 AT 4:18 PM

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