Anti knock sensor

Jongo88 · Post by **Jongo88** » Thu Jun 11, 2009 5:48 am

Does anyone know where the anti knock sensor is on a 2002 cc??
Is it in a water jacket?

Post by **HenryJ** » Thu Jun 11, 2009 7:05 am

It is shown to be on the top of the engine behind the distributor on the left side. Are you having problems?
Pinging or detonation is usually related to something else. The timing can only retard so far.
I have seen a couple bad KS but it is far from common. The sensors can develop a coolant leak on older models. I have only had one fail for unknown reasons and that was a very long time ago on a fleet vehicle. I am not sure it was even a Chevrolet.

Jongo88 · Post by **Jongo88** » Thu Jun 11, 2009 7:33 am

I got a ses light. I went to Advance to get it scaned and that is what came up.

Post by **HenryJ** » Thu Jun 11, 2009 7:55 am

What exactly was it? Check the connections first. Clear the code and see if it returns. In the mean time add your scheduled dose of injector cleaner, change the fuel filter if needed and see if the code returns.

Jongo88 · Post by **Jongo88** » Thu Jun 11, 2009 8:38 am

The code has been cleared. Everything like fuel filter and stuff is new. Seafome every 6th tank. Plugs wires cap and rotor in the last 3 monts. Only have 67,ooo miles now.
Was just driving along and the ses light came on. Lost some power on take off for one take off.lol. Then turend into Advance and had it checked. His scanner said knock sensor. I had him clear it. It seems to be ok. I drove it home from there about 2 miles then 20 miles to work. No light yet.

Post by **HenryJ** » Thu Jun 11, 2009 8:44 am

:fingers crossed:
If it returns and you hear any audible ping, it may be worth having the muffler shop check the cat/precat for back pressure and a possible restriction/plugging.

Jongo88 · Post by **Jongo88** » Thu Jun 11, 2009 9:50 am

The pre cat was just removed about 5 weeks ago, It looked like brand new.... But we will see... Thanks...

Jongo88 · Post by **Jongo88** » Fri Jun 12, 2009 6:09 am

100 miles and no light... Who knows..

04crewvt · Post by **04crewvt** » Fri Jun 12, 2009 6:15 am

Any chance you got a cheap tank of gas that was bad?

Post by **HenryJ** » Fri Jun 12, 2009 7:00 am

Many failure require multiples before illuminating the MIL. Keep your fingers crossed for a few weeks.

Jongo88 · Post by **Jongo88** » Fri Jun 12, 2009 7:25 am

04crewvt wrote:Any chance you got a cheap tank of gas that was bad?

There is no cheep gas any more..lol. It's the same tank so far...

04crewvt · Post by **04crewvt** » Fri Jun 12, 2009 7:29 am

There may be no inexpensive gas but there certainly are places whose gas can be of a lesser quality. I pretty much stick with 89 octane which seems to run better in my trucks over 87 (this is both in my Tahoe and Crew) and I have found a station that still is ethanol free which seems to help as well.

Jongo88 · Post by **Jongo88** » Fri Jun 12, 2009 8:20 am

I have always ran 87 with no problems so far. We have no ethanol free gas down here in Florida...

04crewvt · Post by **04crewvt** » Fri Jun 12, 2009 9:52 am

Search on E10 gas and see how many problems are cropping up because of it. One tank with too much alcohol could certainly cause a drive ability problem ( not saying that is definitely your problem) but it is possible.

Jongo88 · Post by **Jongo88** » Fri Jun 12, 2009 11:42 am

The thing is that there is no problems. It runs perfict. The ses light just came on. When that happens there is eather a problem or a bad sensor. So when the scanner came up with a knock sensor that to me means it is bad. I think it's just a matter of time before it comes back on. Bad gas will make run bad not make a knock sensor send a code that its bad.
That's just me thinking....

04crewvt · Post by **04crewvt** » Fri Jun 12, 2009 11:58 am

Yea without knowing exactly which code they cleared it's hard to tell.
here is a list of possible codes for Knock sensor. I am not sure if we have one or two so I listed them all.

P0325 Knock Sensor 1 Circuit Malfunction (Bank 1 or Single Sensor)

P0326 Knock Sensor 1 Circuit Range/Performance (Bank 1 or Single Sensor)

P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor)

P0328 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor)

P0329 Knock Sensor 1 Circuit Intermittent (Bank 1 or Single Sensor)

P0330 Knock Sensor 2 Circuit Malfunction (Bank 2)

P0331 Knock Sensor 2 Circuit Range/Performance (Bank 2)

P0332 Knock Sensor 2 Circuit Low Input (Bank 2)

P0333 Knock Sensor 2 Circuit High Input (Bank 2)

P0334 Knock Sensor 2 Circuit Intermittent (Bank 2)

If it comes on again make sure they tell you which code came up or invest in a ScanGaugeII, well worth the money for not only checking codes but keeping track of lots of other engine parameters.

Jongo88 · Post by **Jongo88** » Fri Jun 12, 2009 12:21 pm

Thanks. I will keep that in mind. I will get the code.. I hope there won't be a next time but we know there will be....

Jongo88 · Post by **Jongo88** » Sat Jun 13, 2009 5:00 am

160 miles and still no light???

Jongo88 · Post by **Jongo88** » Wed Oct 07, 2009 10:42 am

Well guess what... The code came back.... I have a Scan Gauge 2 now.. lol. It is a PO 327 Knock sensor.... What will cause it? I will clear it and see what happens....

04crewvt · Post by **04crewvt** » Wed Oct 07, 2009 10:48 am

I would check the weatherpak conector to see if it is fully seated and locked as well as for corrosion at the terminals, if they look good I would say it's time to replace the sensor.

Jongo88 · Post by **Jongo88** » Fri Mar 05, 2010 4:58 pm

I replaced the sensor today.. What a PITA that was. I hope none of you have to change it.
You have to remove the dissy and the fuel lines and it is still hard. I got it though. Time will tell if it works.

dozer1530 · Post by **dozer1530** » Wed Jun 23, 2010 5:15 pm

is it ok to put a higher octane in my 03 zr5 rather than the normal unleaded

Jongo88 · Post by **Jongo88** » Wed Jun 23, 2010 5:18 pm

May I ask why would you want to???

dozer1530 · Post by **dozer1530** » Wed Jun 23, 2010 5:22 pm

idk lol iv always wondered if i would gain anny thing

rlrnr53 · Post by **rlrnr53** » Wed Jun 23, 2010 5:44 pm

The gains generally not worth the extra .10 to .20 a gallon that you have to pay. In my truck, I didn't see enough gains to make it worth it for me.

dozer1530 · Post by **dozer1530** » Wed Jun 23, 2010 5:53 pm

ok ty

Jongo88 · Post by **Jongo88** » Wed Jun 23, 2010 6:12 pm

Just a recap on my sensor change... The truck runs so much better and no more code...

roadrunner · Post by **roadrunner** » Thu Jun 24, 2010 11:51 am

Tried premium unlead and rlnr is correct. Extra performance/mileage does not offset the extra $.

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