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Will not crank

Tiny
RICH420
  • MEMBER
  • 1984 GMC S15
  • 2.8L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
It ran until I got it home. When I bought it will. I have changed the plugs, wires, cap rotor button, and the ignition start switch. Will turn over but wont crank even if I put gas in cab.
Monday, October 19th, 2020 AT 7:54 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

It sounds like you lost spark to the plugs. I suspect it may be related to the ignition control module in the distributor. To confirm, we need to check for diagnostic trouble codes. This vehicle has an OBD1 system and it doesn't require a scan tool to retrieve codes. All that is needed is a short jumper wire or even a paper clip. Do this first and let me know what you find.

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

I have a feeling you will retrieve a code 42. However, check first and then we will know what directions to move.

Let me know.
Joe
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Monday, October 19th, 2020 AT 8:54 PM
Tiny
RICH420
  • MEMBER
  • 3 POSTS
Please let me know how to do that with a jump wire or send me link so I can see it done.
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Monday, October 19th, 2020 AT 9:36 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

The link above explains how it's done. All you need to do is jump pins A and B on the DLC under the dash. See pic 1.

Let me know if that helps.

Joe
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Monday, October 19th, 2020 AT 9:39 PM
Tiny
RICH420
  • MEMBER
  • 3 POSTS
Okay buddy, I am doing what you said and everything is okay. Well, I went to go use the test light to see if I was getting fire to my coil and then I just touch the top of the cab and the light turned on. So I turn off truck took out the fuse and the light still on and i'm just touching metal.
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Tuesday, October 20th, 2020 AT 11:28 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

What is it that you are touching to get power? If it is the OBD port, it has 12v all the time. Also, what fuse are you referring to? I'm getting confused. LOL

Let me know and feel free to ask questions.

Take care,
Joe
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Tuesday, October 20th, 2020 AT 6:58 PM

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