Can't figure out where to start. Need suggestions
I was getting bad fuel mileage and during i was logging start getting misfire on #1 P0301 and P0300. I turned off dod not sure if it is bad lifter i need suggestions from where can i start?
thanks in advance
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Last edited by Baljit; 08-20-2023 at 09:41 PM.
You didn't really say much about the truck at all.
Like how bad is it? What have you done as far as tune up wise to correct it?
I don't know what you think it's suppose to get, you do have DoD turned off too. You're probably only going to avg around 15-17mpg combined.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
I start getting misfire on cylinder 1 during i was logging code P0301 and P0300 I am not sure if it is lifter or coil or bad spark plug so i leave it for a while will start fresh in the morning.
I think its normal
my 2022 Escalade runs 15 MPG
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