lewissa81

Given that you've explored most of the reasons for that code, and that that's your only code, it's time to explore every possibility. Make sense?

2002VertGt

Makes sense, but what is left to explore besides o2?

2002VertGt

Any other ideas?

littlejohn

You might want to look into the cats being clogged. I am having the same issue new motor and all. My mechanic replaced one and it ran alot better but not perfect so they are doing the other side today. We will see what happens!!!!

lewissa81

Have you seen this page:
https://repairpal.com/OBD-II-Code-P0171-and-P0174

littlejohn

so my problem was not the other cat it was the #4 fuel injector. Hope you can figure out what is wrong with yours. Good luck

Newfiedan

If the cat is clogged run cataclean through the fuel system it does work. I used it to clean my cat out.

2002VertGt

in don't think it's clogged cats because I lowered my y pipe and it still ran like crap..

2002VertGt

what code were you throwing? I have been thinking injectors. Cause it happened after my cousin took my intake off. The first time they tried to take the rail off cause they couldn't get the quick disconnect off....When they got it off they put the injectors that they had gotten out back in...

RLXXI

Need a scan tool with live data viewing to be sure, everything you have stated makes me believe they may have kinked or pinched the new intake gasket (O-ring) and/or cracked the manifold by over tightening it, I would want to look at how the O2 sensor is switching in real time, it may be going bad.


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