97 CHEVY CHECK ENGINE LIGHT ON

1997 Chevrolet Silverado

Tiny

j.stieg

July, 30, 2012 AT 3:45 PM

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?

FOUND 17085 RELATED QUESTIONS

8 Answers

Tiny

Docfixit

July, 30, 2012 AT 4:03 PM

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

Tiny

j.stieg

July, 30, 2012 AT 7:28 PM

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

Where should I start?

Tiny

Docfixit

July, 30, 2012 AT 8:09 PM

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

Tiny

j.stieg

July, 31, 2012 AT 8:33 PM

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.

Tiny

Docfixit

July, 31, 2012 AT 8:58 PM

Yes it is try replacing Knock Sensor

Tiny

Docfixit

July, 31, 2012 AT 9:00 PM

Do you have timming light for possible additional testing

Tiny

j.stieg

July, 31, 2012 AT 9:43 PM

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

Tiny

Docfixit

August, 2, 2012 AT 7:21 PM

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

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