j894

'99 accord lx
F23a1
5sp
Freshly rebuilt head
New tbelt kit
New eBay knock sensor

Originally I threw p0325 and p1259 after getting my head rebuilt etc. My.knock sensor broke causing p0325 and p1259 went anyway after clearing it.. I thought they may have left the VTEC solenoid unhooked or something.

Anyway I got a new knock sensor and it was fine but then threw p0325 after driving about 20 miles. And it wasn't until beating the car a little that the code set. Not long after setting p0325 for the knock sensor it again threw p1259 for the VTEC solenoid. It seems as though the VTEC solenoid code only is set when the knock sensor code is set. Are these circuits related??

Also p1259 sets without me even really beating on the car.

Also does anyone know the resistance spec for the knock sensor? I measure infinite ohms when testing through the sensor and through the sensor lead.. as well as testing from sensor to block. Not sure if I'm testing it correctly.

j894

Also, anyone know the torque specs for the knock sensor?

Edit: Fond it, the knock sensors torque specs are 23Ft/lbs (21Nm). Going to double check mine.

holmesnmanny

It's critical to actually know what happened and when. You jump around so much in your post I can't tell when what happened and when.

In order to get good help, especially in situations like yours, we need information, and in the correct order.

j894

Sorry was on my phone when posting originally typing a little at a time. Here is a rough timeline:

-Had a burned valve recently so my head was rebuilt along with a new tbelt kit.
-the shop that did the work accidentally broke the knock sensor. So when I got the car back the check engine light came on for p0325(knock sensor) and p1259 (VTEC solenoid).
- I cleared the initial codes and only the knock sensor code came back at first. I thought the shop may have just left the VTEC solenoid unhooked at first when reassembling, causing the code, then just didn't clear it after hooking the solenoid back up.
- I got a new eBay knock sensor and installed it. The car was fine for about 15-20 miles and I got the knock sensor code back when beating on it going up a hill. The new sensor is still hooked up and in 1 piece when I checked
- it wasn't until after the knock sensor code set that the VTEC solenoid code set again, so I wasn't sure if these circuits were related. The VTEC solenoid comes on even when staying under 3500rpm.

-did some testing of the VTEC solenoid last night according to the test procedure and have the correct voltage at the wiring and the correct resistance at the top plug of the solenoid, but didn't have time to go further
-going to try and check knock sensor wiring tonight, but I can't find an official procedure

So, at this point I'm looking to see if anyone knows if these codes are related and if anyone has a knock sensor circuit testing procedure

j894

Update:
-Knock Sensor code p0325-
Got a used OEM knock sensor from a bone-yard for next to nothing while I'm waiting for a replacement new one to come in. Installed the used one yesterday and the code went away - I now have no problems. Thankfully... I made some progress. I'll probably just keep the used sensor in as the ebay ones I guess can have quality issues.

-Vtec solenoid code p1259-
Also got a used Vtec solenoid/spool assembly at the junk yard for testing. Swapped the solenoid part of the assembly (Looks like a barrel with 1 wire connector and triangle shaped mount) and was still getting the code within a mile of driving and without even going over 3,000rpm. Grrrr

Went through the testing procedure again and found I was getting intermittent continuity between the 2 terminals on the vtec solenoid pressure sensor switch (screwed into the side of the vtec spool). This detail fooled me the first time around. Anyway, I checked the used pressure sensor I just got and it had constant continuity between the 2 terminals all the time .. hmmm

After swapping the pressure sensor/switch the code went away and all seems well. For now.