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1990 Suburban wont start

Tiny
WYATTGC
  • MEMBER
  • 1990 CHEVROLET SUBURBAN
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 80,000 MILES
1990 burb, v1500 350 tbi 80k miles. It sat for the better part of a decade.
Changed the tank, pump, sending unit. Map sensor tps sensor,
plugs/wires, and the iac valve. It was running fine (did blow the gauge
cluster fuse a while back) Went to the store and parked, came out and no
dome lights, gauge lights, headlights, radio nothing. It cranks, gets spark
but wont fire. Turn signals work, check engine light doesnt come on. I'm at
a loss. I don't get fuel pressure/the pump doesn't turn on. The battery is
BRAND new (switched it out with another known good one to make sure.)
Also the reel light works under the hood. All fuses under the steering
column are good.
I'm at a loss here.
What should I check first? Thanks
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Saturday, January 16th, 2016 AT 2:44 PM

9 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Does the check engine light come on for bulb check when the key is first turned on?
Do you have injector pulse?
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Saturday, January 16th, 2016 AT 3:08 PM
Tiny
WYATTGC
  • MEMBER
  • 5 POSTS
The check engine light does not come on and the injectors don't pulse. There is power getting to the fuel pump. No it doesn't turn on and still no lights whatsoever (just turn signals work)
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Saturday, January 16th, 2016 AT 4:37 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
If the check engine light doesn't come on for bulb check then your computer is not powering up. You need to check those fuses in the engine compartment better. Use a test light.
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Saturday, January 16th, 2016 AT 4:39 PM
Tiny
WYATTGC
  • MEMBER
  • 5 POSTS
I've check and rechecked the fuses under the steering wheel, all the ones in the fuse box are good. What fuses in the engine compartment do I need to check and where are they?
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Saturday, January 16th, 2016 AT 4:59 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
You need to see if the "ECMB" fuse has power in and out with the key on.
There are also fusible links to check. They will be either at the starter or a junction block in the engine compartment.
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Saturday, January 16th, 2016 AT 5:19 PM
Tiny
WYATTGC
  • MEMBER
  • 5 POSTS
The ECMB does not have power in or out, the ECM does however, thanks a ton by the way.
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Saturday, January 16th, 2016 AT 6:00 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Move onto the fusible links
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Saturday, January 16th, 2016 AT 6:04 PM
Tiny
WYATTGC
  • MEMBER
  • 5 POSTS
Can you check fusible links with a test light? I don't have much experience with them. Also, anything I should check for? Would a bad fusible link cause my lights and fuel pump not to work?
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Saturday, January 16th, 2016 AT 8:15 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
Fusible link are special sections of wire that melt when overloaded. You can check them by pulling on them and if they stretch, they are burnt internally. Use only fuse wire to replace that section. NEVER regular wire. These links feed the fuse boxes so you can lose many functions with one burnt link.
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Saturday, January 16th, 2016 AT 8:19 PM

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