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No start and backfiring through the exhaust

Tiny
PCHEFSONYA
  • MEMBER
  • 1997 CHEVROLET 1500
  • 4.3L
  • 6 CYL
  • AUTOMATIC
  • 180,000 MILES
Backfiring through exhaust. Changed out distributor, coil pack, ignition module, crank sensor and finally the PCM. Code P1351 comes back immediately after clearing and still no start and backfires excessively through exhaust.
Thursday, March 1st, 2018 AT 9:01 AM

8 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon.

The first thing I would do is check the compression. If the timing chain moved and the engine is out of time, it will do this.

Did it do this prior to all the repairs performed?

Roy
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Thursday, March 1st, 2018 AT 2:45 PM
Tiny
PCHEFSONYA
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  • 31 POSTS
Hi Roy,
The compression is at least 160 on each cylinder. It came in as a no start, tried everything listed above. Not sure what to try next.
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+1
Thursday, March 1st, 2018 AT 3:25 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, verify the firing order on the cap to be sure the wires are not mixed up.

Roy
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Thursday, March 1st, 2018 AT 4:16 PM
Tiny
PCHEFSONYA
  • MEMBER
  • 31 POSTS
I have done that as well. I also get 0388 code on a long crank. Something is sending high voltage to the crank sensor.
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Thursday, March 1st, 2018 AT 5:31 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Can you verify that code number? I do not see a 388 code.

High voltage? Twelve volts from the ECM fuse 1 is the feed to the pink wire. You cannot get more than battery voltage.
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Thursday, March 1st, 2018 AT 6:02 PM
Tiny
PCHEFSONYA
  • MEMBER
  • 31 POSTS
Are you talking about the pink wire going all the way to the coil? I am sorry I think the code is P0388, high voltage to crank sensor.
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Thursday, March 1st, 2018 AT 6:25 PM
Tiny
ASEMASTER6371
  • MECHANIC
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I have checked Alldata and Mitchel and cannot find the 388 code.

Where did you get that information?

Yes, the pink wire goes to the coil, cam and crank sensor.

Roy
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Thursday, March 1st, 2018 AT 6:38 PM
Tiny
ALAN BARR
  • MEMBER
  • 1 POST
Take the distributor back out. Turn the rotor 180 degrees and put it back in.
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Wednesday, September 14th, 2022 AT 11:58 AM

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