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p0171 code, replacing intake manifold , 2002 5.3 Silvy vin T

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Posted

(2002 Silverado 5.3, 251,000 miles, runs strong but CEL is on)

 

Hello...receiving a p0171 code only, and will be doing the following this weekend:

 

replacing valve cover gaskets (leaking anyway)

replacing intake manifold gasket

replacing front and rear knock sensors

replacing fuel filter, because it's time to

 

recently:

new spark plugs,

spark plug wires,

air filter,

left and right front 02 sensors (original OEM Denso - Canada built truck)

 

I have a few questions related to the job, and have numbered them for easier answering, if anyone could help. Thanks in advance!

 

Questions are:

 

1) Do I need to replace the valley pan gasket, and oil seals around the knock sensors?

2) Do the intake bolts need to be replaced, or can they be re-used?

3) Can the plastic intake manifold and throttle body (non flex-fuel 5.3) be cleaned using sea-foam or similar, or would it damage the plastic?

4) If anyone could give a complete list of parts you would recommend replacing, while doing the intake manifold gaskets, it would be much appreciated, with or without part numbers. I don't want to leave anything out, and have to take it apart again unnecessarily.

 

Thanks, to anyone who can help. Y'all have been great over the years!!

 

 

 

 

Chris Senior Enthusiast

Chris

Posted
Posted

The valley cover doesn't need to be removed to change knock sensors, but replace their wire harness. Also some black RTV around the top of the rubber cups.

Chris Senior Enthusiast

Chris

Posted
Posted

Mine didn't go. I changed my knock sensors around 80k and engine change around 110k. So I don't know when they would.

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