97 CHEVY SILVERADO CHECK ENGINE LIGHT ON

  • Tiny
  • j.stieg
  • 1997 Chevrolet Silverado
  • 178,000 miles

Check engine light is on and I have found that driving it is not what sets it, It comes on with the second key run/engine on cycle.

Symptoms are an occasional jerk.

I get codes P0340, P0327pd, P0340pd, concerning the cam and knock sensor.

What has to be done to troubleshoot this, and repair?

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Monday, July 30th, 2012 AT 3:45 PM

8 Replies

  • Tiny
  • Docfixit
  • Expert
  • 18,991 posts

What engine? Do you have a DVOM? Manual? Really need to be diagnosed with a scan tool but can do some with DVOM

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Monday, July 30th, 2012 AT 4:03 PM
  • Tiny
  • j.stieg
  • Member

Engine is a 5.7l Yes I have a digital muti-meter, and a analog meter.

Where should I start?

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Monday, July 30th, 2012 AT 7:28 PM
  • Tiny
  • Docfixit
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  • 18,991 posts

Locate Knock Sensor Left engine below exhaust manifold forward starter. One wire dark Blueremove. Key oncheck voltyage from wire to ground if 5V then OHM check KS treminal to ground 100K ohms let me know

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Monday, July 30th, 2012 AT 8:09 PM
  • Tiny
  • j.stieg
  • Member

I checked for voltage at KS with the key in the run position and there was 5v.

Then I checked the resistance from KS blue wire to ground and I got 4.21 on the 20k setting, seems high to me.

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Tuesday, July 31st, 2012 AT 8:33 PM
  • Tiny
  • Docfixit
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  • 18,991 posts

Yes it is try replacing Knock Sensor

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Tuesday, July 31st, 2012 AT 8:58 PM
  • Tiny
  • Docfixit
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Do you have timming light for possible additional testing

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Tuesday, July 31st, 2012 AT 9:00 PM
  • Tiny
  • j.stieg
  • Member

Oh I measured the wrong side. This time I measured the terminal on the KS itself to ground and it was about 100k I replaced the sensor a few days ago. That code is off now.

Main concern is code P0340

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Tuesday, July 31st, 2012 AT 9:43 PM
  • Tiny
  • Docfixit
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  • 18,991 posts

CMP in DIST pull conector key on check for voltage if present then replace CMP

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Thursday, August 2nd, 2012 AT 7:21 PM

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