2000_Silverado_5.3

Hello all,

If anyone could share some information with me I would very much appreciate it. I have a 2000 Silverado LS 2WD with a 5.3 engine that has around 168,000 miles on the odometer. I have replaced the fuel pump once at around 120K. I purchased the vehicle used from a Chevy dealer in California in 2004 and it had about 45K at the time and it has always been a champ. I am now in the process of trying to pass smog and I am stuck. I have had a mechanic reset the ECM parameters after replacing the knock sensors and the check engine light has come on after about 20 miles several times.

I installed an AEM intake with a K&N air filter and programmed it with a Hypertech device and installed a Magna Flow Cat-back muffler about 8 years ago.

I replaced both knock sensors and the wiring harness and installed new gaskets. The harness only installs one way (green wire towards the firewall). I torqued the manifold at 44 inch/lbs on the first pass and then 89 inch/lbs on the second pass in the correct sequence. I cleaned the entire engine meticulously. I torqued the knock sensors to 15 lb/ft and the connections are good. I have taken out and inspected the ECM connectors and they are in pristine condition. I also replaced the PCV valve. There was a bit of oil residue in the intake manifold and throttle body that I cleaned very well.

With the engine running I have no voltage to the plug (from the fuse box) that connects to the knock sensor harness (I understand that it should be 5V???).

The error codes still read P0327 and P0332 low voltage input banks 1 and 2.

To add insult to injury, I saw a Prius of all vehicles, on the freeway billowing smoke as I was driving to my mechanic. Such is life.

I appreciate any feedback.

Thank you and best regards,
Patrick

01WS6BLACKLS1

What brand sensors did you get?

2000_Silverado_5.3

Hello and thank you. I bought the knock sensors from 1a auto. My mechanic told me they are showing as connected properly and I used an ohm meter and got continuity to ground for each (I'm not sure if that is any way to check them).
http://www.1aauto.com/
Thanks,
-Patrick

01WS6BLACKLS1

Are they gm sensors though? I had the same codes on my Trans Am. I bought the gm sensors 500 miles no CEL.

01WS6BLACKLS1

Did you by chance get the pair for like 39.00 ?

2000_Silverado_5.3

These are the parts I installed...
http://www.1aauto.com/engine-knock-s...=808435&y=2000
They are not OEM I would assume. Not Delphi or whatever. But the good news is I've had it apart twice now and I'm getting faster at doing it! Maybe the third time will be a charm. From all of the info I've gathered I might need to replace the ECM because of the low voltage error code. I've read about corroded ECM terminals, especially for trucks, but I took my ECM out and checked the connections and it all looks good, not even a speck of dust inside.
-Patrick

01WS6BLACKLS1

Here is what you need bud. These are what I bought. Gotta use OE sensors at the least. I work at a GM dealer and I can Assure you these are good prices. Also that dorman harness is as good of quality as the GM imo.

http://www.summitracing.com/parts/ad...3521/overview/

http://www.summitracing.com/parts/rnb-917-033

2000_Silverado_5.3

Thank you, I'll try that next. Do you happen to know if I should have 5V supplied TO the knock sensors (from the ECM)? I'm not sure if I understand the low voltage error code correctly. If I'm ever in PA I owe you a beer. Thanks again.
-Patrick

01WS6BLACKLS1

Np man. Yes from what I remember 5V. Like I said. Getting those GM knock sensors and that harness should fix your problem man. Keep me posted.

68BBChevelle

iTrader: (12)

Ever get this fixed? Ive replaced all mine with gm stuff and still get codes.