1994 Chevy Suburban ignition and fuel systems

Tiny
D4570
  • MEMBER
  • 1994 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 8,000 MILES
I have a 94 Sub with a "NEW" GM 5.7 motor with 8000 miles. I was driving down the road and it just shut off. The Fuel and ignition system shut down. There is power to the fusses and there good, for the affected systems. The code reader shows a 81, and 82 code witch are a transmission code. The ignition switch on the steering column looks ok and I put in a new distributer and coil on installation of the motor. Where should I look next?
Friday, December 4th, 2009 AT 9:54 AM

7 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Welcome to the forum, when the problem occurs, if no spark at plugs, check coil primary circuits. Positive to coil goes hot when you turn on the key, usually, no crank. If no voltage may have to check feed to and from the ignition switch.


https://www.2carpros.com/forum/automotive_pictures/170934_94_sub_57_2.jpg



The coil is at bottom of picture. the feed to the ignition switch is two red wires, hot all the time, protected by fusible links.
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Friday, December 4th, 2009 AT 10:09 AM
Tiny
D4570
  • MEMBER
  • 4 POSTS
Thanks
I have power to all the systems. It cranks well and power to the fuses for the Ign, injectors, and fuel pump but nothing works. No gas no spark.
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Friday, December 4th, 2009 AT 12:43 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Do you have primary voltage at ignition coil, key on? Use a testlite.
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Friday, December 4th, 2009 AT 1:43 PM
Tiny
D4570
  • MEMBER
  • 4 POSTS
To the fuse not the coil.
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Sunday, December 6th, 2009 AT 10:11 AM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Check the smaller wires at the coil. The pink wire goes hot with the key on.
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Sunday, December 6th, 2009 AT 11:27 AM
Tiny
D4570
  • MEMBER
  • 4 POSTS
NO
No voltage to the coil on any wire and no power to the fuel pump either?/
PS I'm working on it out side and it has been -26* so some of my answers may be slow. Thanks.
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Wednesday, December 9th, 2009 AT 5:23 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
That kind of cold is dangerous. I'd wait till spring, lol. Also check the circuits at the fuel pump relay.
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Thursday, December 10th, 2009 AT 9:04 AM

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