Recent content by 120 New Jack

So everything is back together without major issue. I had to use a screw clamp to fix a small coolant leak on the rear heater core hose but otherwise it went back together fine. While I had the intake off I carefully cleaned the carbon from the intake runners and replaced the O-rings for the...

I was considering it but thought that maybe the failed secondary air injection was allowing air into the driver side exhaust manifold and possibly causing the bank 1 O2 sensor 420 code mentioned earlier. I wanted to rule out everything before having to actually replace the manifold/cat combo.

Progress. Having a low-rise 1/4" socket wrench and a 10mm socket cut down to be a shallow socket will let you get to the check valve mounting bolts. ..I don't recommend removing the rear coolant bridge to access the check valves as it involves many unnecessary steps. Getting to the ones for...

Decided to replace everything while I have the intake off. Found a really good tutorial video that I linked below. As of today the parts cost close to a grand, but that's for OEM stuff. The video has links to all the parts needed on Amazon in the description. I could've cut the cost in half...

Took another listen today to see if I could nail down the exact location of the high pitch noise and cut out at around 40 seconds. Sounds like it was somewhere under the intake manifold where the SAIS is so I removed the intake manifold to see if I could find anything obviously wrong. All the...

I'm now up to speed on the secondary air pump location, the diverter and both check valves. Hopefully I can find some time tomorrow to hear if that high pitch noise is coming from the driver's side check valve way in the back behind the intake manifold. I like the simplicity of the bypass but...

Jstsa thanks for the help man. You may have saved me replacing a manifold.

So The link to the Hewitt tech site explains quite a bit. Definitely seems like this could be causing my cat troubles.

I forgot to include that this sound doesn't occur if I let it get to operating temp then turn it off for a minute then restart.

Just saw this thread was moved. Thanks Mod!

Bisho thanks for the info and heads up. I'll check into the secondary injection pump, thanks for the link Jstawgn. Gonna repost this in the proper GX sub forum.

Aw crap.. can the mod move this to the GX GXOR forum? :facepalm: Sorry guys

Hi guys, I hope you can help diagnose a high pitch noise that begins at startup and cuts out at the 45 second mark in the linked video. Without headphones you can only really hear it when it cuts out. I don't think this is a normal sound and it may have been this way when I bought it. I started...