2003 GMC Savana OBD code PO327 and PO332

WALTER G

MEMBER
2003 GMC SAVANA
5.3L
V8
AUTOMATIC
145,000 MILES

The two codes came in after a water pump replacement. Also, the belt tensioner and fan clutch. The engine runs good, idles smooth. The 2 ks sensors and wiring harness were replaced. Some water in sensor holes but not enough to short out connectors. The pcm connector reads 100 k ohms towards each sensor. I also replaced the pcm with a flash programmed used unit. The crankshaft variation po315 came in and I understand the need to re learn that. The po327 & po332 continued to return? Put the original pcm back in.
Between each step the codes were erased and returned right on schedule with a few drive cycles. I am not hearing any audible 'knock' that might bring the codes in. I am looking for any suggestions that might help to clear this problem.

2 Replies

HMAC300

MECHANIC
48,601 POSTS

If the knock sensors were not torqued to 15 ft lbs it screws them up so they don't read correctly. Also because the water pump was replaced remove all water in knock sensor holes. See pics for testing. And tips.

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Friday, July 31st, 2015 AT 6:59 AM

WALTER G

MEMBER
2 POSTS

Thanks for your message. My service manual agrees with the 15 ft. Lbs. For the sensors and unless I made a mistake that should be right.
I used a shop-vac to clean and dry the sensor holes. I did not use any thread sealer, etc. I used a light coat of silicone sealer on the rubber plugs where they contacted the valley pan and where the wire passed thru.
Thanks again for your input.

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Friday, July 31st, 2015 AT 7:36 AM