Running lean p0171 p0174
- Thread starter 22duece44
- Start date
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Found 2 hoses one at the back near spare tire. It comes from near filler neck next to cap and I can not find where it should go by tire side. Checked the best I could and did not find any open ports.
second hose coming from above transmission and same thing could not see where it I suppose to go to. Any idea?
Canister purge valve
Purge vent valve looks new
p2272 for bank 2 sensor 2 also looks like a new sensor both bank 2 sensors look new.
Also looks like new tank filler all hoses has been checked. For now, I have a smoke machine on order and will get to the dealer to reset alcohol level as soon as I can
second hose coming from above transmission and same thing could not see where it I suppose to go to. Any idea?
Canister purge valve
Purge vent valve looks new
p2272 for bank 2 sensor 2 also looks like a new sensor both bank 2 sensors look new.
Also looks like new tank filler all hoses has been checked. For now, I have a smoke machine on order and will get to the dealer to reset alcohol level as soon as I can
Attachments
FWIW: the evap purge valve is on the engine, and is commanded on when fuel vapor is being drawn from the evap canister into the intake manifold during purge events. It's closed -- or should be -- with the ignition off.
The evap canister vent valve near the rear of the truck is not a purge valve, it's a vent valve. It's open with the ignition off.
The evap canister vent valve near the rear of the truck is not a purge valve, it's a vent valve. It's open with the ignition off.
Just got the truck alcohol percentage reset and went to 3 percent. Also reset furl trims and truck runs better arm but their is still an issue. Fuel trims long term show fuel is showing 30percent with regular 87 gas. I did not find any vacuum leak as of yet but the previous owner did say he changed the fuel injectors with cheap amazon injectors. So I will either changed the fuel injectors with original injectors just to be safe or proce around to tune engine.
Ok so after reset and also reseting fuel trims suv is hard to start. Turned key and engine cranks for about 3 to 5 seconds to turn and kill. I had to do it 10- 15 times before it starts and stays running. Runs better now with engine reset. Also filled gas with 97 from empty half a tank and alc level went from 3 percent to 0.8 percent after driving on high way.
Yet again at cold start its hard to start same way. Long term fuel trims goes to 30 percent after it starts instant. At idle fuel d trims for short both sides is 1 to 3 percent.
At rpm higher than 1200 fuel trims clime to 30 percent.
The owner before changed the fuel injectors and found wrong fuel injectors was installed with a flow rate of 30 gallons per hours
It's suppose to be the 50 gallons per hour fuel injectors
12609749
I have placed these on order and will let you guys know if it completely fixed the issue
By any chance does this unit has a inline fuel filter dealership could not find any part number but they service tech is saying it's on frame but I could not find any
Yet again at cold start its hard to start same way. Long term fuel trims goes to 30 percent after it starts instant. At idle fuel d trims for short both sides is 1 to 3 percent.
At rpm higher than 1200 fuel trims clime to 30 percent.
The owner before changed the fuel injectors and found wrong fuel injectors was installed with a flow rate of 30 gallons per hours
12580681
It's suppose to be the 50 gallons per hour fuel injectors
12609749
I have placed these on order and will let you guys know if it completely fixed the issue
By any chance does this unit has a inline fuel filter dealership could not find any part number but they service tech is saying it's on frame but I could not find any
Nope. The "filter" is attached to the fuel pump in the tank. It's basically a nylon fine mesh sock on the pickup tube.
Ok changed injectors with re-mans. SUV is no longer running lean now bank 1 is running rich around -12 short term seems perfect and code p1175 came up. Also p2272 is still permanent after driving for a good 15 mins. Will replace spark plugs, all 4 o2 sensors , and throttle body once they get here to see if anything improves. Main issue is now fixed. Went from 8 mpg on hwy doing 60 mph running lean. To 18 to 22 mpg at 60 mph
If the -12 is the LTFT on that bank you may want to reset the fuel trims with a scanner so it can relearn them from scratch. The stored values may adjust faster that way. But if you keep on driving it, eventually they'll level out (not saying they'll be good, if there's another issue).
Sorry I did not mean short term. I did mean LTFT -12 the only issue is with bank 1 I didn'id not check today but I will drive it to work for a week after I change the last few parts. I did do a global reset and I will reset fuel trims tomorrow.
