2001 S10 Codes

[bcrooms]

My dad has a 2001 S10 that has been having some trouble recently.  I finally had time to connect my scanner to it and I found the following CEL Codes.

 

P0128

P0171

P0174

P0341

 

I've researched these codes some, and I believe I can fix the first and last one.  Not sure about P0171 & P0174.  I read where it could be a vacuum leak, and I do have a testing device for that, but I visually inspected the vacuum lines yesterday and didnt find any apparent leaks.

 

Any advice is appreciated.

 

Thanks,

Brandon

[silveradosid]

what engine does it have

[bcrooms]

1 hour ago, silveradosid said:

what engine does it have

4.3L V6

[Possum1967]

I believe it's an o2 sensor.  But it could very well be a vacuum leak as well. 

[Motor City Rick]

Brandon,

 

First, DO NOT replace the O2 sensors!!! When you have lean codes (P0171 and P0174) on both side of the motor it tells me you have vacuum leak somewhere on the intake manifold. Get a can of carb spray, ...and give small squirts to various places on the intake, hoses, or any seals on the intake and notice a change in engine speed. It sounds like going to find problems there, ...not the O2 sensors.

 

Next "only install"l a 195 degree thermostat. Code P0128 tells me your motor did not get to the 195 degree temp within 7 1/2 minutes. Using a colder thermostat will create more problems than you can imagine.

 

As for P0341, if you truck has a zillion miles, you might be in the early stages of a "stretched" timing chain if nobody diddled with the crank position sensor. Clear codes and see what returns after the thermostat and intake part reseal.