Valve Cover Gasket job

[Rock_Rat]

I started up my engine yesterday, having finally putting everything back together after spending the last several weeks slowly replacing my timing belt and valve cover gaskets, as well as the plugs, wires, tube seals, etc., etc.

I was really excited when it fired up and sounded great. Today I fired it up and got a CEL, VSC and TRAC combo. I have had the P0446 issue, so I threw on my OBD and checked to see if that was the case, but unfortunately I am getting P0325/0330.

I read [MENTION=116467]Rock_Rat[/MENTION]'s post and a few others. Is it possible I did something and the codes are because of anything other than the knock sensors failing or is this just a shitty coincidence?

I am annoyed because I contemplated taking a few more pieces off and replacing the sensors while I was in there, but I didn't want to drop another few hundred bucks replacing sensors that were not failing.

Both codes at the same time would lead me to the sub-harness. That's the only thing common to both sensors other than the ECU. I would start my troubleshooting with the following two possibilities:

• It's pinched and not seated correctly in the shallow "valley"
• The connector is not connected. (small triangular shaped 3-wire connector)

Keep in mind, most folks experience a slow degradation of the sensor/(s) and are able to reset the codes for a period of time.

If your codes are immediately coming right back on after resetting them then I would say you have a "hard" failure in the system. IE: disconnected harness or possibly a sliced or nicked wire, perhaps a wire that has pulled out of the connector.

 

[mtbtim]

Nicely done. I'm up next, although it may be a while before I have a free weekend to tackle this. I'm a bit intimidated by the brittle harness shroud! I may deal with a leaky trans speed sensor and proactive radiator replacement first.

If you look back in the thread on the first page, you'll see the video I posted. In the video, we pre-tape the harness before manipulating it a bunch and this keeps it intact. There's no need to break it all off and do some other type of wrap if you follow what we did.

 

[octanejunkie]

If you look back in the thread on the first page, you'll see the video I posted. In the video, we pre-tape the harness before manipulating it a bunch and this keeps it intact. There's no need to break it all off and do some other type of wrap if you follow what we did.

Well except that mine was already broken and chipped off in a few spots for whatever reason, pieces of it were in the injector valleys, so I just broke it off as others have said. If you can salvage it, more power to you!

 

[AnotherCO4Runner]

If your codes are immediately coming right back on after resetting them then I would say you have a "hard" failure in the system. IE: disconnected harness or possibly a sliced or nicked wire, perhaps a wire that has pulled out of the connector.

My codes are immediately coming right back, within a minute of clearing them while driving. I am going to inspect the connector for any loose or damaged wires. I am also going to clean it and see if maybe some dielectric grease or other foreign substance is on the contacts.

It was a loose connector!!! It didn't click in as "crisply" as I would have liked, so I am going to keep an eye on it, maybe add some tape if it comes loose. I am so grateful I am not taking it all apart again so soon. [MENTION=116467]Rock_Rat[/MENTION], thanks for the help!

 

[Rock_Rat]

It was a loose connector!!! It didn't click in as "crisply" as I would have liked, so I am going to keep an eye on it, maybe add some tape if it comes loose. I am so grateful I am not taking it all apart again so soon. [MENTION=116467]Rock_Rat[/MENTION], thanks for the help!

That's awesome! I'm so glad I was able to help you out. It's always a good feeling. :dance: