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Discussion Starter #1
I just had to get a new pcm in my truck, and now it throws a knock sensor code, i'm going to take it to the shop when i get a day off and have them look at it, but autozone's scanner brought up knock sensor

ive never had the engine light come on before the new pcm, so im thinking it might just be the new pcm, ive heard that when a knock sensor it bad, you know it. my truck just runs just like it did before, its a 4.8 turd just like usual

wondering if anyone has a bad knock sensor in our trucks to tell me what to look for
 

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replaced both knock sensors, they were falling apart because of the rust. the truck ran ok with them bad, changed them out and felt no difference


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Discussion Starter #3
i did a rough mpg estimate today, and came out to 7mpg. drove 100 miles, used a half tank of gas, my truck should have a 26 gallon tank

comes out to 7 mpg, definitely not right, maybe the sensors are bad!
 
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