2001 Toyota Highlander v6 3 litre engine
Hello Scotty, I am a huge fan of your videos, I am watching your videos from more than 10 years, live in Calgary, Alberta Canada.
I hope you can help with this issue of my SUv, no mechanics can figure it out, it’s been showing p0174, p0171, p01150, p01153. Basically it says bank 1 and bank 2 lean. And It burn too much gas now. Since gas is very expensive now a days it’s killing me now. Please let me know what should I check more, replaced map sensor, oxygen sensors, pcv valve, todays checked the system leak with home made smoker like your videos one. What’s else should i check. I am very frustrated now. I will really appreciate your kind help.
blesses.
Both cylinder banks are complaining. They're both stuck Lean. You've been troubleshooting the air side of the equation.
But it seems no matter how much the computer lengthens the injector pulses it can't get enough fuel into the cylinders to maintain stoichiometry of the air:fuel ratio mixture.
What would cause that? Weak fuel pump. Clogged injectors or voltage issue at the fuel injectors. Fuel pressure regulator dumping too much fuel back into the gas tank.
Unlikely there's clogged fuel injectors on both cylinder banks at the same time.
That leaves a possible fuel delivery to the fuel rail problem.
Could be a weak fuel pump.
Perhaps the fuel pressure regulator is returning too much fuel back into the gas tank.
It's splitting hairs because your fuel pressure regulator is on your fuel pump module inside the gas tank.
So has anyone checked the fuel pressure?
Has anyone looked at the Freeze Frame data from when those codes are being set or at the Live data to see any relationship between the AF sensor voltages and fuel trims at idle and maybe around 2500 rpms?
Maybe do a fuel pressure test at the rpms when those codes are being set (look at the Freeze Frame data for that)
Thank you so much Scotty, I am really sorry to respond very late, bcz I was not thinking someone can respond in any blog that fast, and I totally forgot about it. No it’s still same until today. No mechanic could figure it out it’s issue. It’s still burning gas like 16 cylinder big commercial truck engine sadly.