sensor voltage

[suffolkauto01]

again check esm wiring

[ony]

I borrowed a flucke meter it reads 0 volts with key on engine off, .005 with the engine running and the sensor unplugged.

[suffolkauto01]

005 is ground make sure u hit range so 0.00 and your on dc is it a fluke 88 again i think your in the wrong area i seen this a lot and it was the esm are you getting code 43 don't test between 2 wires check the power wire using batter ground and also check the ground wire using battery ground at ground should be below or .030 on v/dc if higher bad ground Check for 2.5 dc volts on the knock sensor circuit, key on engine off (KOEO), with the knock sensor plugged in. If the voltage is over 3 volts, f

[suffolkauto01]

what is exact car

[ony]

1991 c1500 4.3 chevy not getting any codes.i will do some more checking.its a flucke 77

[suffolkauto01]

what is car doing I know you see knock on scanner but what is drivability issue? if it has no codes honestly I think you are trying to fix something that is not broke are you looking at counts or actual knock because counts is checks

[ony]

it is retarding timming and burning more fuel an when it knocks that way I cant do any tunning I am addicted to playing with this truck. it is valve train, piston, or bearings worn out causing the knock. what is suprising to me is the right side sensor will pick up knock255*4 in10 miles it screws into the back of the head,unplug it plug the left side in no knocks except when you shut off the engine 13 knocks. left side screws into the water jacket on the left head ,all I can figre out is the knocks meghrts wont travel trough the water. both sensors around 8k ohms unplugged 1 at a time and data loged.[[[ taking donations for a engine with a mild cam ]]]

[ony]

what year is a good 350 vortec that would be a easy swap with my 1991 4.3?