so I have a 2006 Blobeye Impreza WRX. I had a full rebuild around 8k ago now, and things have been fine up until the last two months or so. I now have the following issues that any advice would be greatly appreciated on:
1 - My car boosts fine following an oil and filter change, but after around 1.5-2k it starts to make a strange noise after around 5-7psi of boost. After an oil and filter change it then boosts up to 19psi with no issues or noise.
2 - My car is using oil - a lot! Every week I seem to be topping up oil levels. I have took the filler cap of whilst running and no puffs of smoke, since owing the car (one year in January2018) it has had 5 oil changes, with magnetic sump plug fitter after the first. Which when I change has a small amount of what I can only describe as magnetic sludge on it. No metal partials, just a very fine dust like sludge. This scares me! But reading around I have read that it could be the new bearings wearing in??? I have also read about the PCV valve and that this can increase oil use. Is this true? and where do you find this part in the UK I've looked everywhere! I have part numbers 11819AA001 and 11810AA000 and can only find and import from America - what! My car is also not smoking at all on start up. Condensation yes, but no blue smoke, and when I try and rev or boost higher than just normal driving I don't get clouds of smoke either. Turbo and seals okay I believe?
3 - If i drive at a constant speed/engine load (by this I mean RPM) of above 3k in any gear I get a flashing engine management light - the worst! I've researched and found that this is a misfire. Specifically on an OBD reader is cylinder one. I have done the following to try and rectify it with no success: 1) New set of NGK Iridium Plugs. I've gone for PFR7 (standard STI plugs) as I have a few mods including a ECUtek map that is only running 275bhp, with approximately 19psi of boost. Now I gaped these plugs to 0.65, but then now read that they are 0.7 as standard. Could this be the fault? I have also changed the coil for another one that I had from an STI Intake that I bought, and has not resolved the issue, or changed the cylinder.
4 - when idling from a cold start it idles very well and consistently. When driving if I drop my clutch, the engine speed drops and nearly stalls (<300rpm approx) and then catches itself and increases, it never actually does stall. I have had my MAF sensor out and cleaned this, but made no difference.
Now I am no mechanic at all, but I am handy with a spanner and willing to learn, so I hope I haven't embarrassed myself here. This is my first Subaru, and first performance car so please be nice guys. Any advice is greatly appreciated. This is also my daily driver and does around 150-170 miles per week.
Thanks in advance,
P.S. list of mods:
-Rebuilt short block with V7 Pistons, new rings and V10 rods. Honed block and built to a tolerance of "two thou" (so I am told). Re-skimmed heads and pressure tested before fitting. All usual gaskets and seals replaced and including Crank and big end bearings.
-Full decat exhaust with ninja two backbox
-inner wing induction system - with clean K&N filter
-ECUTek remap at 275bhp (tested at Corten Miller - Lincolnshire) after run in of new build
- BC Coilovers - hard ride!
- Standard Recirculation valve
- Silicone hoses all round except turbo intake - doing when I next work on the car
Exedy Stage two organic clutch fitted with rebuild
Using Subaru Black JDM Oil filter and 5-40 Fully Synthetic Castrol Titanium oil
- Planned mods: JDM STI intake with Subaru TGV deletes and STI Pink injectors (bought), and maybe a rebuilt turbo expenses and fiancee permitting lol, and then remap to suit.