So we got the new heads and intake on and the truck runs great! but when driving around town earlyer i got 2 check engine codes, one was p0701 ( bank one o2 sensor lean) and the other p0174.... i read about the 2nd one and it said to clean the MAF sensor, so we got some cleaner... i cleared the codes and they stayed off for awhile then we parked and started the truck again and same thing. code, cleared, and stayed off. now on the way back home i messed with the gas alittle and gave it about 1/3 throttle for about 2 seconds... afr 14-14.5 then let off the gas, afr-18.5-19 then we got on it 60-70 mph for a quick burst afr-10.5-11 then let off and it hit 19.... any ideas? the truck runs strong as hell just the afr and the codes? im gunna clean the MAF sensor once the truck cools and see if that helps?

 

quick update, so far this is were im at.

quick question

any ideas? im waiting for the silicone to dry

 

bump........ any ideas? thanks guys....

 

assuming its got a tune for the heads and intake?

 

It got a retune for the new heads and intake. It may need some ve tuning.

 

o2 sensors are a 5 volt reference its easy to check that and ohm them out. they do go bad/get dirty as hell/melt Btw i believe you mean PO171 and 174 which are both lean conditions. a p0701 is a trans code. But definitely look into a more refined tune using some data logging stuff (technicians use Mode 6 data which goes more in-dept than the generic BS you fine with just about any scan tool) so they can get it more spot on for you. Also its easy to pull the o2 sensors and see if it has been running rich or lean, kinda like pulling the plugs on a carb'd engine.

 

My p0171 p0174 codes were due to a vacuum leak after the maf on the intake ... Caused from the crappy hose supplied with the aftermarket intake...
I looked up those codes and they are usually related to vacuum leaks or o2's, or maf sensors
Hope that helps

 

ya my bad dude, po171 and po174.... were gunna try the starter fluid trick and see if we can figure out if theres a vacuum leak

 

Definitley look for vacuum leaks, highly unlikley that the 02's went bad right after you had the top end apart, if it isnt that it probably needs a little more work on the tune, your moving more air now then you were...good luck

 

Well we tryed the started fluid trick and couldnt find a leak. we un hooked and reinstalled the plug wires and we took a drive. using my PLX i got this.... At WOT the afr was at 10-11.2 when i got back to the house at idle i got these.... LTFB1 was showing 15%, and the LTFB2 was also at 15%, and the intake pressure was at 15.0-15.9 at idle the AFR at 13.7-15.0 idk if this helps any thanks for the help guys...