so my truck is throwing out codes agin it has a rough idle as well shekes the whole dash board when driving trys to shut off any one know wat these signs may bee ohh and i checked my spark plugs and found that one was really full of carbon so i changed it a helping had would be apreciated thanks

 

Care to share the codes so we can see where to start?

 

po171 bank 1 is to lean do u think if i put a fuel cleaner it ill work

 

I would look at vacuum leaks especially the rubber PCV elbow at the back of the throttle body and clean the MAF..

 

done that i checked the pcv valve for leaks and its good and the maf its good as well i cleaned it up

 

did you inspect the elbow at the back of the throttle body? it commonly is the cause of that code.

 

Take at the air injection valve and associated plumbing.

 

Yea the elbow is fine abd glen r ???

 

Sorry about that, I was thinking one thing and typing another. I actually meant Idle Air Control Valve. It can cause erratic idle and staling, usually only when the vehicle is cold. It is located on rear of intake. There are a couple of right ups on here about cleaning it. Another thought is the EGR system.

 

If it were a vacuum leak, would it not effect both banks and throw both p0171 and p0174? I would think if it is just bank 1, it would be something specifically related to that bank. Either there is too much air getting in or not enough fuel.

 

The egr is good it functions corectly now that air control valve is fine toocuz I disconect it and it shuts of the truck so iys doing its jov rite

 

arron, get your feet on the ground.
Liquid fixes are not the way for specific codes the computer is telling you, there is.
Have you looked up the code to see what the discription is?
171 is indeed the code for lean bank 1. <<<<<But>>>>> not it's specific cause.
The causes for it can be many.
These type codes can be set for both lean and over rich conditions.
The over richness can be leaking fuel regulator. To much fuel.
Fuel pressure to high. To much fuel.
Fuel pressure to low. To little fuel.
Intake air leak. Causes either to much or to little fuel as an end result.
Vapor recovery system faults. Same thing.
Certain EGR system faults. Same thing, as well as a shift in ignition timing.
Dip stick not seated or it's tube rusted through letting air into the crankcase.
These all result in a great upset in air/fuel ratio and cause roughness and drivability issues.
You have to work with the presented code and not a bottle of cleaner.
Begin by investigating each area for a fault same as a good mechanic would have to do.
I'm not trying to be a hard a** but you need to do it this way to help yourself.
Everything is not fine or you would not be having a problem.
Good luck.

 

TThanks blue grass ill check it agin tomorow ugh.