2001 Sierra 4.3 fuel mileage
10-04-2017, 07:54 PM
#1
2001 Sierra 4.3 fuel mileage
I started using my reg cab truck to commute about 100mi round trip back in July. I rebuilt the front end, ball joints, hubs, brakes etc. and after some fresh wheels/tires it drives like new again. The truck just recently hit 120K so it's not an old clapped out POS. Yet... lol.
When I started driving it I would average right around 18mpg every tank. I noticed it starting to lose one to two mpg so I put plugs/wires and fuel filter on it. The plugs looked like hell so I figured that was the problem. Kept driving, kept getting worse... now I'm around 14.8ish on the last tank. I plan on changing the O2 sensors this weekend and probably just gutting the cats. This truck sat and was driven very little for the 4 or so years prior to this summer. I'm concerned that the humidity around here may have gotten the cats. No biggie.
If the fresh sensors and eliminating the possibility of a partially plugged cat doesn't get my mileage back, where next? MAF looks to be ok, and clean. Air filter is in good shape too.
When I started driving it I would average right around 18mpg every tank. I noticed it starting to lose one to two mpg so I put plugs/wires and fuel filter on it. The plugs looked like hell so I figured that was the problem. Kept driving, kept getting worse... now I'm around 14.8ish on the last tank. I plan on changing the O2 sensors this weekend and probably just gutting the cats. This truck sat and was driven very little for the 4 or so years prior to this summer. I'm concerned that the humidity around here may have gotten the cats. No biggie.
If the fresh sensors and eliminating the possibility of a partially plugged cat doesn't get my mileage back, where next? MAF looks to be ok, and clean. Air filter is in good shape too.
10-05-2017, 05:28 AM
#3
Baby jesus I hope not.... it would be a tough decision wether to put a marine intake on this thing or shove this 4.8 I have here staring at me in it. The truck isn't down on power at all. Still runs great. Just started drinking like a college frat boy lately lol
10-05-2017, 12:05 PM
#4
Other Mod was, we cut the Baffle off the back side of the TB blade. It made it more responsive.
10-09-2017, 08:04 PM
#5
Crawled around on the truck today, the oil pan and intake manifold gaskets are leaking oil and coolant along with the fuel injector issues.
I'm strongly considering buying a cheap commuter car and prepping the truck for an engine... I have an 08 4.8 with less than 10K on it sitting here Begging to go in this truck...
I'm strongly considering buying a cheap commuter car and prepping the truck for an engine... I have an 08 4.8 with less than 10K on it sitting here Begging to go in this truck...
Last edited by silver-mod-o; 10-09-2017 at 08:12 PM.