I've posted before about my 2001 Chevy 5.3 with 292K on the clock misfiring above about ~4000rpm but running fine otherwise.
I tried changing the coil, wires, plugs, injectors, etc. It got a little better but didn't completely fix the problem.
Members here suspected it was a mechanical problem like lifter/cam or valve springs.
However, I've been driving the truck every day instead of my other vehicle for over a month now. I've driven several thousand miles... I drive a lot! Anyway, it used about half a quart of oil every 1500-2k miles based on my casual observation of the dipstick. So I added some Bars Engine Repair to the oil.
Anyway, yesterday and today I was really pushing the truck hard up a few long hills at high speed, well into the 5k rpm range, and there was no misfire. Before, the misfire was very consistent, it would happen every single time I pushed it that hard. I added that Bars stuff like a week ago, and until now I haven't gone above 4k rpm because I hardly ever need to.
Could the Bars Engine Repair really have solved the problem? I have been running Valvoline Maxlife 10w-30 oil. Looking forward to hearing your theories or thoughts on this!
I tried changing the coil, wires, plugs, injectors, etc. It got a little better but didn't completely fix the problem.
Members here suspected it was a mechanical problem like lifter/cam or valve springs.
However, I've been driving the truck every day instead of my other vehicle for over a month now. I've driven several thousand miles... I drive a lot! Anyway, it used about half a quart of oil every 1500-2k miles based on my casual observation of the dipstick. So I added some Bars Engine Repair to the oil.
Anyway, yesterday and today I was really pushing the truck hard up a few long hills at high speed, well into the 5k rpm range, and there was no misfire. Before, the misfire was very consistent, it would happen every single time I pushed it that hard. I added that Bars stuff like a week ago, and until now I haven't gone above 4k rpm because I hardly ever need to.
Could the Bars Engine Repair really have solved the problem? I have been running Valvoline Maxlife 10w-30 oil. Looking forward to hearing your theories or thoughts on this!