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Gary, Technician
Category: Car
Satisfied Customers: 16765
Experience:  GM master tech for 15 years/ASE master tech for 20 years
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2002 Chevy K1500 5.3L engine. Check engine light on cods Pll33

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2002 Chevy K1500 5.3L engine.
Check engine light on cods Pll33 and Pll53.
Changed oxgen sensors upstream bank one and two.
Check for ground and voltage OK
Engine runs great for 8 miles then it loses power
Turn key off for about 2 minutes then engine run great
for about 6 miles. Then bank two no power.

Welcome to Justanswer ! my name is XXXXX XXXXX i will do my best to assist you with this problem

do you have any access to a scan tool to view live computer data ?

when it looses power does it bog down when you try to accelerate ?

Customer: replied 3 years ago.

I scan tool and yes when you give it gas bog down.

I also changed the mass air flow

when its acting up and bogging down what are both front O2 sensors reading for MV ?
Customer: replied 3 years ago.

I really don't know.

I did not have a scan tool with me.


ok we need to see if BOTH O2's are fixed below500MV when its acting up

if they are that is showing lean and since the MAF is new you more than likely have a plugged fuel filter or low fuel pressure causing this problem

since its bogging down usually leads to a MAF, plugged cat convertor, plugged fuel filter or low fuel pressure

you can also connect a fuel pressure gauge to the test port on the fuel rail and see if the fuel pressure is reading 55-62 psi key on engine off and hold

if its below that spec the fuel filter is plugged or you have a bad fuel pump

if you had a fuel pressure regulator issue it would cause very extended cranking problems

since you did not mention that as a problem its more than likely one of the 2 Dennis


Gary and other Car Specialists are ready to help you
Customer: replied 3 years ago.

they are 2 cat on truck would they both my bad.

very rare they both would go bad

and usually would not run good then choke out

usually when cats are plugged they act up all the time

Customer: replied 3 years ago.

ok thank you