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Shut off while driving and would not start?

Tiny
ANGI ALLARD
  • MEMBER
  • 1993 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 300,000 MILES
It cranks but won't start. Replaced fuel pump and filter, ignition module, MAP 02 sensor, plugs and wires. I'm getting code 43. Electronic spark control. My boyfriend says he replaced it too.
We got it to start but it shuts off when you give it gas. I saw you had the trouble tree for code 43. Could you send me a copy? And should we test/replace knock sensors. Thank you
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Tuesday, May 16th, 2023 AT 3:01 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

No problem. There are two different diagnostics provided. One is if the vehicle has an electric shift transmission and the other is not electric.

I attached the diagnostics below for both. I'm not sure which you have. The first five pics are the non-electric shift. The last three pics are for the 4L60E electronic transmission.

Let me know if this helps or if you have other questions.

Take care,

joe

See pics below. Note: The diagnostic tree is cut in two to make it readable for you. I did overlap them so you can follow from one to the next. Also, I don't think the knock sensor would prevent it from running.
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Tuesday, May 16th, 2023 AT 8:40 PM
Tiny
ANGI ALLARD
  • MEMBER
  • 3 POSTS
Thank you for the info. The previous codes I got were lean exhaust, map voltage and fuel pump pressure. He said the knock sensors rotted off some time ago. He doesn't know how to treat such a great invention- me and the automobile.
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Wednesday, May 17th, 2023 AT 8:48 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

You are very welcome. I hope they help. Let me know if you have other questions or if I can help in any way.

Take care,

Joe
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Wednesday, May 17th, 2023 AT 8:06 PM

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