Crank no start gauges always on while battery is hooked up?

Tiny
LOST MN HUNTER
  • MEMBER
  • 1995 GMC YUKON
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 145,000 MILES
I replaced a blown up 95 5.7 with a 91 5.7 Truck fired right up. But it wouldn't shut off with the key. All lights and gauges are on with battery hooked up. Pulled coil wire to shut it off. It won't start now. I have Spark and did jumper wire on fuel pump relay. Pump runs but no fuel out of TBI. I have been told I have ground issues. Cleaned and removed all ground wires. Added more grounds to engine/frame and body. I'm really stumped at this point. Engine turns over good. All gauges are on with key out of ignition. Replaced PCM with a used one. Didn't change anything. Need help guys!
Tuesday, September 19th, 2023 AT 12:28 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Will the engine run with starting fluid? Also how does the engine sound while cranking can you please upload a short video with your phone? You can upload it here in your response. I am wondering if you lost compression. We should run the codes as well. Let's go over this guide:

https://www.2carpros.com/articles/car-not-running-advanced

and

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

It does sound like the PCM is still bad, running the codes should help us. Please go over these guides and get back to us.

Was this
answer
helpful?
Yes
No
Thursday, September 21st, 2023 AT 9:47 AM
Tiny
LOST MN HUNTER
  • MEMBER
  • 2 POSTS
Replaced PCM again. No change. Good battery.
Good compression, fuel pump runs but nothing comes out of the throttle body.
Engine will run on either.
Lights still on the dash without key in the ignition. Jumped pin 87 and 30 to rin fp.
I don't own a code reader so I have no codes to give you.
This is my engine bay. Nothing like other picture I have seen with fp relay on firewall.
Ready to give up on this pos.
Image (Click to make bigger)
Thumb
Was this
answer
helpful?
Yes
No
Thursday, September 21st, 2023 AT 11:32 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
We can fix this; can you remove the fuel injector connector and then turn the key on and use a test light to see if you have 12 volts on one of the wires? Please check out this guide:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Please go over this guide and get back to us.
Was this
answer
helpful?
Yes
No
Saturday, September 23rd, 2023 AT 10:30 AM

Please login or register to post a reply.

Related Engine Not Running Content

Car Cranking but Not Starting? Try This
VIDEO
Car Cranking but Not Starting? Try This
Instructional repair video
Engine Not Starting
GUIDE
Engine Not Starting
Over the past 20 years at 2CarPros we have identified the top problems that are easily fixed. This guide can save you a trip to the repair garage or calling a tow truck and...
VIEW MORE