dbullen

I purchased the car with 120,000 miles and it now has 264,000 miles, mostly city driving in the 7 years I've had the car. I have always run 91 octane since I've had the car

Figured I would post this in case someone has an H6 with the same issue and has already replaced or cleaned IAC 2003 Subaru Outback H6 w/ 264,000 Miles Idle was running a bit high in park (1200rpm) it gradually got worse and eventually idle started hunting in park and then in drive, as well as running high. Cleaned IAC, no change, Replaced with known used working IAC no change. Issue ended up being EGR that was plugged soild of carbon buildup. After EGR was cleaned and new gaskets installed everything is now back to normal.

3 were replaced a while back, all he did this time was clean them all (3 were really built up with carbon) and 3 were okay but cleaned anyways. He visually inspected fuel pump and also tested it, checked fuel pressure, checked a number of sensors (cam shaft, crank shaft sensors I believe), may have checked a few other things, and finally ended up by process of elimination at fuel injectors, so he took them out, saw the carbon build up and cleaned everything. After putting back together it ran smooth and no more codes.

Car was fixed, issue was fuel injectors (3 of them), carbon build up, he did a cleaning of all injectors and car is running great now. I guess reason all 6 were misfiring was because pressure regulator was on the side that had the issue, and was some how affecting the other injectors

Tech finally has some time to look at it next week. I ordered 6 used injectors just to have on standby as he thinks there might be something going on with the injectors. He's going to check injectors along with fuel pump, although seems as if fuel pump is unlikely because pressure seems to be okay. Coils were replaced not too long ago with subaru ones. Hopefully won't be to difficult of a fix. Will post results once he takes a peak

Spark plugs were replaced about 1 year ago with subaru ones. Timing chain tensioners were replaced about 2 years ago. Master tech listened to the engine when he had a few minutes yesterday, he said it's not timing or chain tensioners/guides.

2003 Subaru Outback H6 (3.0), getting random misfire codes on all 6 cylinders. Still idles okay (But sounds rough) no loss of power. Showed P301 - P306 codes, as well as 2 of the cylinders showed misfire/lean fuel code. Had tech test fuel pressure with gauge it was fine (39 psi), I replaced fuel filter with new Subaru Filter. I filled up tank to full to see if that would make a difference and it still ran the same. No loss of power that I can notice under acceleration. 256,000 Miles on the car. (about 8 months ago 3 of the injectors (2,4,6) were replaced with genuine OEM subaru ones. ) However symptoms here were misfire in only 1 cylinder (About 6 months ago 3 of the Coil's were replaced with genuine subaru ones - can't remember which sides ) - However symptoms here were misfire in only 1 cylinder. Fuel Pump was replaced 3 years ago (It had failed completly) and was replaced with a used one from a Low Mileage Subaru H6. Any suggestions on what else to check? Normally I have a master subaru tech that can diagnose and fix for me, however he is tied up for the next 2 weeks.

But I do get a shutter/vibration when under load/ up hill, accelerating from a stop.

Was rebuilt by a friend of mine who is a master subaru tech at one of the dealers. Has worked great the last 100,000 miles until now.

Gotcha, Do you know if this is the way it's setup in a 03 Outback LL Bean with original motor? I guess I will just remove plastic cover find out.

Nope it's full, and carrier bearings were replaced approx 100,000 miles ago when I had transmission rebuilt.

Appears to be the carrier bearings in the front differential that is causing the noise, looks like they will have to be replaced.

Nuts on both wiper arms are on tight. Does anyone else have any other thoughs?

Whenever I shut off front wipers they stop in the middle of the window (Or whatever position they are in when I switch it to off) instead of retracting. Also when I use the mist button it stops in random spots each time instead of retracting. Is this the wiper motor needing replacement or is something else going on?

It's an H6 LL bean, so don't believe VDC. The humm starts at 30 mph or so and is gone by 35-40 mph. Or atleast faint enough you can't hear it over the engine/wind noise (It is loudest around 33/34 MPH). I've noticed it for probably 6 months, but in the last few weeks has gotten much lounder.