P0171 Code Bank 1 too lean HELP
Thread Starter
Teching In
Joined: Jan 2023
Posts: 21
Likes: 3
From: Oklahoma
P0171 Code Bank 1 too lean HELP 77 Chevrolet K10 4x4 LM7 / 4L60e / NP241C / LSXceleration Stage 2.1 Cam 218/227 .523/.523 HR112+3, Delphi GM LS7 Lifters & Lifter Guides , LS6/LS3 Valve Spring, Brand new O2 sensors 50 psi fuel pressure , just drive it home from
Tuners..
I keep getting bank 1 too lean and then it runs like crap no
Throttle response have to disconnect negative battery post to reset computer ..I have checked for vacuum leak @ intake , Booster hose , exhaust manifold , PVC hoses , checked all injector connections I’m running out of ideas ..Your input would be very helpful ..Thanks in Advance
Tuners..
I keep getting bank 1 too lean and then it runs like crap no
Throttle response have to disconnect negative battery post to reset computer ..I have checked for vacuum leak @ intake , Booster hose , exhaust manifold , PVC hoses , checked all injector connections I’m running out of ideas ..Your input would be very helpful ..Thanks in Advance
Last edited by Inrelentlesspursuit; Dec 15, 2023 at 08:58 PM.
Thread Starter
Teching In
Joined: Jan 2023
Posts: 21
Likes: 3
From: Oklahoma
Data Log [
Data Log
QUOTE=Inrelentlesspursuit;20533761]77 Chevrolet K10 4x4 LM7 / 4L60e / NP241C / LSXceleration Stage 2.1 Cam 218/227 .523/.523 HR112+3, Delphi GM LS7 Lifters & Lifter Guides , LS6/LS3 Valve Spring, Brand new O2 sensors, just drive it home from
Tuners..
I keep getting bank 1 too lean and then it runs like crap no
Throttle response have to disconnect negative battery post to reset computer ..I have checked for vacuum leak @ intake , Booster hose , exhaust manifold , PVC hoses , checked all injector connections I’m running out of ideas ..Your input would be very helpful ..Thanks in Advance[/QUOTE]
Data Log
QUOTE=Inrelentlesspursuit;20533761]77 Chevrolet K10 4x4 LM7 / 4L60e / NP241C / LSXceleration Stage 2.1 Cam 218/227 .523/.523 HR112+3, Delphi GM LS7 Lifters & Lifter Guides , LS6/LS3 Valve Spring, Brand new O2 sensors, just drive it home from
Tuners..
I keep getting bank 1 too lean and then it runs like crap no
Throttle response have to disconnect negative battery post to reset computer ..I have checked for vacuum leak @ intake , Booster hose , exhaust manifold , PVC hoses , checked all injector connections I’m running out of ideas ..Your input would be very helpful ..Thanks in Advance[/QUOTE]
Thread Starter
Teching In
Joined: Jan 2023
Posts: 21
Likes: 3
From: Oklahoma
Just re-checked the situation. While there is plenty of fuel, I think that the spark is either intermitt or missing on the driver's bank. The drivers side exhaust is cold and the passengers side is too hot to touch
After researching of a few forums
1. Broken valve spring
2. Bad ground on back of head (might try ohm it to make sure that wires not broken internally)
3. Bad ECU
After researching of a few forums
1. Broken valve spring
2. Bad ground on back of head (might try ohm it to make sure that wires not broken internally)
3. Bad ECU
Thread Starter
Teching In
Joined: Jan 2023
Posts: 21
Likes: 3
From: Oklahoma
Went and cleaned all the grounds, the two on the back of the head, the one going to the body the ones at the front of the block and the one from the battery to the body and now my battery is really charging compared to what it was in the past and the driver side exhaust is back to being hot confirmed it my pouring water on each cylinder.. Haven’t drove it but it’s titled for 30 minutes without a problem.. will update this post once I drive it for a while
Launching!
Joined: May 2023
Posts: 286
Likes: 94
From: AZ
77 Chevrolet K10 4x4 LM7 / 4L60e / NP241C / LSXceleration Stage 2.1 Cam 218/227 .523/.523 HR112+3, Delphi GM LS7 Lifters & Lifter Guides , LS6/LS3 Valve Spring, Brand new O2 sensors 50 psi fuel pressure , just drive it home from
Tuners..
I keep getting bank 1 too lean and then it runs like crap no
Throttle response have to disconnect negative battery post to reset computer ..I have checked for vacuum leak @ intake , Booster hose , exhaust manifold , PVC hoses , checked all injector connections I’m running out of ideas ..Your input would be very helpful ..Thanks in Advance
Tuners..
I keep getting bank 1 too lean and then it runs like crap no
Throttle response have to disconnect negative battery post to reset computer ..I have checked for vacuum leak @ intake , Booster hose , exhaust manifold , PVC hoses , checked all injector connections I’m running out of ideas ..Your input would be very helpful ..Thanks in Advance
I would check fuel pump and injectors
another possibility is MAF sensor
Thread Starter
Teching In
Joined: Jan 2023
Posts: 21
Likes: 3
From: Oklahoma
I’m running the stock regulator and return line back to the tank new Walbros 255 in tank pump …The injectors may need cleaned the truck set for sometime .. Should I go with the Corvette regular that I bought ? With No return ? I cleaned the MAF yesterday
Last edited by Inrelentlesspursuit; Dec 17, 2023 at 08:12 PM.
