The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Loss of power on acceleration when warm, backfires a lot.

**dean jendro** · 04-09-2021, 06:02 PM

Not sure why you aren't getting any codes. Running that poorly should trigger some response from the computer.

My truck with 5.3Vortec motor was running like crap for a while, including some back firing and very rough idle and poor throttle. The only codes I was getting was lean condition on the left bank. I tried a few basic tune things to no avail.

One day I decided to take off the bracket that holds the coils on the left side just to clean things up and inspect the coils. I had already installed new plugs and wires.

One of the coils was cracked on the bottom side and could not be seen unless it was removed. I had some spares so I changed out the coil and it runs perfectly again.

04-09-2021, 06:02 PM	#3
dean jendro Old and crusty Join Date: Jan 2009 Location: Surprise, AZ Posts: 462	Re: Loss of power on acceleration when warm, backfires a lot. Not sure why you aren't getting any codes. Running that poorly should trigger some response from the computer. My truck with 5.3Vortec motor was running like crap for a while, including some back firing and very rough idle and poor throttle. The only codes I was getting was lean condition on the left bank. I tried a few basic tune things to no avail. One day I decided to take off the bracket that holds the coils on the left side just to clean things up and inspect the coils. I had already installed new plugs and wires. One of the coils was cracked on the bottom side and could not be seen unless it was removed. I had some spares so I changed out the coil and it runs perfectly again. __________________ 65 Chevy long wide daily driver - SOLD! 64 Chevy Short Step LS