Bad knock sensor, caused by Timing chain guide TSB?

[kaizenveryfast]

I tried to smog my car the other day and failed for running rich. I pulled code 33 and 34 from the ECM, O2 and KS. Before I shell out for a new knock sensor, could it be triggering a code because of the noise caused by the timing chain guides? I have not got this taken care of yet, as it is only a TSB and should not be a serious fault to require a recall. The KS is kind of expensive and hard to replace and I need this thing to pass ASAP. It runs great as it is, and I get a solid 24 mpg on the highway, I'll be on cloud 9 if I replace these 2 and it starts getting even better mpgs. I appreciate the help.

[danielsan]

quick question. does your car feel strong at any throttle input?

[clss240]

im pretty sure the obd1's diagnostics dont operate that way. they only throw a code when an area of interest is dead or shorted. the obd2's however read for caliberation as well. and actuall i dont even know which year car you have. so ya that could be doing it

[bruinbear714]

I tried to smog my car the other day and failed for running rich. I pulled code 33 and 34 from the ECM, O2 and KS. Before I shell out for a new knock sensor, could it be triggering a code because of the noise caused by the timing chain guides? I have not got this taken care of yet, as it is only a TSB and should not be a serious fault to require a recall. The KS is kind of expensive and hard to replace and I need this thing to pass ASAP. It runs great as it is, and I get a solid 24 mpg on the highway, I'll be on cloud 9 if I replace these 2 and it starts getting even better mpgs. I appreciate the help.

If you're running rich, start with the O2 sensor and the coolant temp sensor.

[r3v_v3ng3]

if your car is running rich, it shouldn't trigger the knock sensor.

33 is obviously o2 sensoralso check ect

high HC- distributor cap and rotor, plugs, wires

[kaizenveryfast]

After changing the O2 sensor (which was the cause of all the high readings) and the knock sensor, I went back for the test and barely failed in NOX at 15 mph. Just to see what a bad O2 can do,

Before: @ 15 mphHC - MAX 88 Meas. 272 CO - MAX .52 Meas. 8.38 NO - MAX 704 Meas. 89

After: @ 15 mphHC - MAX 88 Meas. 13 CO - MAX .52 Meas. .04 NO - MAX 704 Meas. 1030 So the typical thing happened, you fix one thing and then another one pops up. Now I have to get that NOX down, probably with the cat now that running rich for a while probably screwed it up.

I will test the coolant temp sensor before replacing it but its not throwing a code.

[clss240]

i would spray some crc maf cleaner in ur mafs while your at it. and ya the cat idea sounds very likely.

[Cone Junky]

You went from running rich to running lean. I would check your EGR ports, ANY exhaust leak before the cat, and run SeaFoam or other FI cleaner.

[kaizenveryfast]

Cone Junky and clss240, did both of those things. Also checked the EGR, and it is working as it should. CTS is within range too. I will replace the cat and see what happens.

[kaizenveryfast]

As an update, passed smog today with the new cat. I got a stock exhaust with a new cat welded on for cheap NOX at 15 mph was 700 out of 704, so I just barely passed, but its not a letter grade. I did check for proper EGR function, but maybe cleaning out the tube and possibly a new valve would knock that number down.