Gripless

Did some testing over the weekend. After idling the car up to temperature in the car park with the bonnet open the intake on turbo side was hot while the other side was barely warm. Say 70c vs 30c between sides. Given the hood was open and hadn’t been making boost the turbo wasn’t very hot leads me to suspect the coolant top tank since that would be at 90c according to the coolant temp sensor. The tank is a killer b one so all alloy and the mount is a 6mm heavy plate bolted to the manifold so it transfers heat well compared to old thin steel or newer plastic ones. https://www.killerbmotorsport.net/shop/utcrv2an-b-upper-turbo-coolant-reservoir-v2-with-an-fittings-631 added some thermal washers above and below mounting plate and Heatsink to the top threads of the bolt. Total cost around $10 https://www.bunnings.co.nz/zenith-fibre-washer-suits-5-16-m8-30pk_p2310760 will it make any difference driving, likely not as only time that intake air will be slow moving is in heavy traffic.

Fitted new steering column shroud that fits the paddles. replaced the hatch release buttons as the main one has turned into goo. Not hard except one nut jammed up under the wiper motor took a little finesse. Remove tail light 3 nuts per side. This reveals 1 plastic screw clip per side, but leave those until last. Do the 4 nuts on inside, then free up the wiring. Then go back and do those plastic screws. The wiring has a mounting clip that you could clip off the old one before the plastic screws. swapped the pump wiring on the dual pump setup chasing a fuel pressure issue. FYI the Dremel spanner fits the radium nuts under the wiring. then the rechargeable light ran out so gave up for the day.

That may have just made the value partly close all the time. sounds like you have a boost or vacuum leak in the lines that controls the valve etc. Time to open and check BBoD

If your bov is making reasonable volume then the intercooler and all the way to intake is likely good. is the boost garage sharing a line with the bov, or is it off something else? have you checked the exhaust valve to the secondary turbo isn’t always open?

I checked the car park for any fresh oil patches.

https://www.classiccover.co.nz/performance/ NAC is a joke unless you have lots of tickets or convictions. The limit maybe as they can’t find the model so think it’s not an sti. does the plate show up in carjam?

There’s a late 90’s car audio scene for model and a radio control cars.

Some newer models have 18x7 or 18x7.5 so maybe tire option for those .

Don’t you measure resistance on the iac solenoid pins to see if the coils are still intact and measure the same. also if you still have AC what happens when you turn it on, Does it still idle faster and slower again when AC off.

Time to pull out the multi meter and measure resistances. But doesn’t the IAC share some wiring with the o2 sensor maybe the old sensor blew a fuse or one of the ignition relays.

https://uk.subaruownersclub.com/forums/topic/2366-manually-reading-ecu-codes/ has clear codes process in the post.

FYI https://www.jdmgarage.co.nz/products/7307 these originally didn’t come with the rubber grommet and used the factory style spring c clips. They are bendable and just mount under one of the knuckle bolts. Being open at the end means you can move the lines without unbolting things. I had them go through LVVTA many years ago without issue.

Well most things are made in China. Buying locally it’s likely the same sensor with more middlemen markup.

Yeah the newer ones are all 4 pin. All basically the same but the sensor or heater is grounded via the sensor housing in 3 pin. Ox336 checks out listed for 89-93 BC ej20 for both SOHC DOHC and turbo or NA. Aliexpress https://www.aliexpress.com/item/1005006776700268.html or https://www.aliexpress.com/item/1005004475249658.html around NZD $25 plus $16 shipping and they add gst etc at checkout.

Use partsouq with your chassis number as the search, don’t even need to log in. under engine cooling section, there will be exhaust section, and then tap on the short number for sensor and it’ll popup the Subaru part number and any substitutes. The Subaru part numbers seem to match Denso You can aliexpress a part number as they list Subaru part numbers Or generic search https://www.aliexpress.com/w/wholesale-Denso-o2-sensor.html