Hoping to get a little advice from those who have turned wrenches far longer than I.
We have a seldom used 2002 Chevy Express 3500 gifted to us by a family member. We only put a few thousand miles a year on it, and other than some maintenance stuff, it's been pretty good to us. It has the 5.7L engine and 4L80E transmission.
We noticed this spring that it smells like it's running very rich. The check engine light isn't on, doesn't feel like it's driving any differently. I plugged in my scan tool just to see what was going on, if anything. Did find one code (P0463), but was more wondering about these fuel trims.
I'm guessing the Bank 1 sensor 2 readings are just showing at 99% and not actually a problem. But the bank 1 values that are both over -10% have me concerned. I took these screenshots with the van in park, but giving some gas so it wasn't just at idle.
I know trims that are highly positive generally indicate a vacuum leak, but what about ones that are negative? Is that an injector problem?
I haven't pulled the doghouse to try and visually inspect anything (there previously had been some rodent damage from the van sitting for years before we got it) but wanted to ask if anyone here could give me a starting point.
We have a seldom used 2002 Chevy Express 3500 gifted to us by a family member. We only put a few thousand miles a year on it, and other than some maintenance stuff, it's been pretty good to us. It has the 5.7L engine and 4L80E transmission.
We noticed this spring that it smells like it's running very rich. The check engine light isn't on, doesn't feel like it's driving any differently. I plugged in my scan tool just to see what was going on, if anything. Did find one code (P0463), but was more wondering about these fuel trims.
I'm guessing the Bank 1 sensor 2 readings are just showing at 99% and not actually a problem. But the bank 1 values that are both over -10% have me concerned. I took these screenshots with the van in park, but giving some gas so it wasn't just at idle.
I know trims that are highly positive generally indicate a vacuum leak, but what about ones that are negative? Is that an injector problem?
I haven't pulled the doghouse to try and visually inspect anything (there previously had been some rodent damage from the van sitting for years before we got it) but wanted to ask if anyone here could give me a starting point.
