Check Engine Light? 2006 GMC Canyon?

[goche]

My check engine light came on and the diagnositc read the system is too lean (bank 1), what does that mean.

 

[musiclicker]

I own a shop, and what I think is this; Bank #1 means there is a problem on that side of the engine. It means something is wrong; such as a sticking injector allowing too much fuel into the engine, a bad spark plug not burning all the fuel, or even a leaking intake gasket on that bank. The most common cause is; an injector that is not closing off all the way due to build up, which allows it to keep putting fuel into the cylinder even after its supposed to be closed off. A vacuum hose that is split where it plugs on, it came off, cracked leaking, or collapsing for whatever reason. Remove the spark plugs on that bank, and compare the way the electrodes look. Usually the cylinder that is the culprit will be wet looking, or will look different from the rest of the plugs. Listen to the injectors as they fire, and you should be able to hear one that is different sounding. You can use a piece of pipe to listen to them with. A lazy injector can do this, and sometimes you have to replace it with a new or rebuilt injector to resolve the problem. On the cylinder that looks different, you will want to make sure its not a firing problem such as a weak coil before you replace the injector.
Glad to help out, Good Luck!!!

 

[ray p]

system lean ,is just what it says,lean condtion I'd look for a restricted fuel filter

 

[coaltruck344]

Lean is too much air look for vacuum leaks
Most likely faulty sensor

 

[Carl M]

Here is what I would look for bad or dirty p.c.v .valve Positive crank case ventilation. or bad or loose gas cap.. on my 01 GMC is what I found after buying 400.00 worth of 02 sensors.