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
Was this
answer
helpful?
Yes
No
Tuesday, June 11th, 2019 AT 6:09 AM
Tiny
TIGERMIKE28
  • MEMBER
  • 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.
Was this
answer
helpful?
Yes
No
+1
Tuesday, June 11th, 2019 AT 9:51 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
My first suspect would be the crank sensor. Very easy to access and inexpensive.

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

Roy
Was this
answer
helpful?
Yes
No
Tuesday, June 11th, 2019 AT 9:57 AM
Tiny
TIGERMIKE28
  • MEMBER
  • 9 POSTS
The crank sensor didn't help.
Was this
answer
helpful?
Yes
No
Tuesday, June 11th, 2019 AT 1:36 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
Was this
answer
helpful?
Yes
No
Tuesday, June 11th, 2019 AT 1:57 PM
Tiny
TIGERMIKE28
  • MEMBER
  • 9 POSTS
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.
Was this
answer
helpful?
Yes
No
Tuesday, June 11th, 2019 AT 3:39 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
Was this
answer
helpful?
Yes
No
Tuesday, June 11th, 2019 AT 4:02 PM
Tiny
TIGERMIKE28
  • MEMBER
  • 9 POSTS
Okay.
Was this
answer
helpful?
Yes
No
Tuesday, June 11th, 2019 AT 4:03 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Keep me updated.

Roy
Was this
answer
helpful?
Yes
No
Tuesday, June 11th, 2019 AT 4:06 PM
Tiny
TIGERMIKE28
  • MEMBER
  • 9 POSTS
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.
Was this
answer
helpful?
Yes
No
Tuesday, June 11th, 2019 AT 4:47 PM
Tiny
TIGERMIKE28
  • MEMBER
  • 9 POSTS
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.
Was this
answer
helpful?
Yes
No
Tuesday, June 11th, 2019 AT 4:54 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
Was this
answer
helpful?
Yes
No
Tuesday, June 11th, 2019 AT 4:58 PM
Tiny
TIGERMIKE28
  • MEMBER
  • 9 POSTS
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.
Was this
answer
helpful?
Yes
No
Wednesday, June 12th, 2019 AT 8:14 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
The module is not working.

I would replace the module.

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

Roy
Was this
answer
helpful?
Yes
No
+1
Wednesday, June 12th, 2019 AT 8:29 AM
Tiny
TIGERMIKE28
  • MEMBER
  • 9 POSTS
That did it. With a fuel line patch it's up and running. Thanks very much Roy!
Was this
answer
helpful?
Yes
No
Wednesday, June 12th, 2019 AT 3:17 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Roy
Was this
answer
helpful?
Yes
No
Wednesday, June 12th, 2019 AT 4:18 PM

Please login or register to post a reply.

Sponsored links