NuclearBacon

Hello USMB!!! I have a 2003 Baja 5 speed N/A with the 2.5L engine. I just put in a new (rebuilt) engine and new (rebuilt) transmission (150 miles now on the running gear). The reason for the new running gear is a story in itself. It now runs great with a nice amount of power and a good idle. The problem is the dreaded P0420. I have replaced the rear O2 sensor with a new Denso (the correct one), however the P0420 still returns. It easily sets all the monitors (53 MPH for 3-5 minutes with 1/4 to 3/4 fuel and no speed variation or brake tapping), but at the same time throws a "pending P0420" thus I know the "check engine light" is not far behind (and, of course, it was). The readings are as follows. The front A/F sensor consistently reads 2.0 to 2.1 volts with an occasional dip to 1.9 volts. A very smooth sine wave. The fuel system remains "closed" during these runs. The rear O2 sensor (unfortunately) reads from .1 through .9 volts. The graph of the rear O2 sensor looks like the teeth of a saw between .1 and .9 volts instead of a nice gradual sine wave between .4 and .7 or .8 volts. The new and old O2 sensors read about the same. Backing off down a small hill under compression with my foot off the throttle produces a front A/F sensor voltage of 5.1 volts, a rear O2 voltage of .000 to .005 volts, and an "open" the fuel system. Any throttle pressure on that hill almost instantly returns the readings to the ones already listed. The exhaust temperature going into the catalytic converter reads around 390 to 420 degrees. The exhaust temperature leaving the catalytic converter reads about 490 to 510 degrees. That leads me to believe the catalytic converter is probably working OK. My only hope (short of buying a new catalytic converter - $$$$) is the front A/F sensor is faulty and reading incorrectly. Is a consistent voltage reading for the front A/F sensor of 2.0 to 2.1 volts the correct range for a 2003 Baja 2.5 non-turbo. I've read that the range should be 2.4 to 4.0 volts, meaning I may be running too rich (see LTFT and STFT below), possibly due to a bad A/F sensor. I failed to mention I have already checked for vacuum leaks, exhaust leaks, etc. All is well. I also have fresh premium Chevron fuel in the tank. Again, the engine runs and idles as if nothing is wrong. Instantly starts, nice amount of power (still new so I haven't pushed it super hard), hits 70+ on the freeway with light throttle pressure, good acceleration from a stop, etc. Nothing should be wrong or is wrong with the engine. I'm leaning toward a bad front A/F sensor giving me a reading outside the computer's parameters, thus ultimately causing my P0420. I haven't dealt with the fuel filter, injectors, fuel pressure regulator, etc because there are no driveability problems, thus I feel it is reasonably safe to ASSUME (I know) the fuel system is OK. My LTFT and STFT all are in the -2 to +2 range, mostly hovering around zero. I would think a fuel system problem ultimately causing my P0420 would show up in the fuel trim readings. What is the correct voltage range for a front A/F sensor on a 2003 Baja 2.5L N/A? If mine is out of range, do you think a new A/F sensor ($130) might be my solution? If not, what do you think might make my P0420 go away so I can get my smog check and my current tags? I don't want to use a spark plug anti-fouler on the rear O2 sensor because the smog stations check for that here in California, thus I would fail my smog check the minute they saw it (as you know, it is easily seen from the engine compartment). Could someone with a Baja, or Legacy with the same engine and no check engine light illuminated, go for a quick ride with their scanner hooked up to read the front A/F sensor, then report back to me their voltage figures? That real world test would, at least, give me a starting point to solve this problem instead of just throwing parts at the car (read rear O2 sensor). Thank you!

Idle air control valve... the hose was disconnected. car runs perfectly I did need that MAF, cars running great!!!

Hello! after selling my EA82T racecar to my buddy, he's been driving it around all over, and today when he got in it, it fired right up as usual, but when the turbo light comes on, it sounds like a pretty bad knock only on boost. Kinda like a HLA but louder, and again, only on boost. Cold engine, warm engine, but if its sitting idling parked, and you rev it, you cannot get the same sound out of it. I'm not to familiar with turbo sounds (for diagnosis) but i would think its...the turbo? no smoke, just a knock. I have a mechanics stethascope, but i cannot get the sound under the hood when its parked! Ideas oh wise ones???? Thank you!

TPS + MAF = Car ran crappy, dies TPS (no MAF) = Car idles, dies under power, but runs otherwise. MAF (no TPS) = Car idles high, dies. IAC Plugged in No leaks from MAF to throttle body All Vaccum hoses good. I didnt try to move over my turbo legacy MAF, since I saw it was 5 wire (92 legacy), then I went to the junkyard, grabbed a MAF that looked identical off of a 94 legacy (again 5 wire, but looked identical) wanted to take it home to try, and when I got to the counter, the pick a part yard wanted $75 bucks. SEVENTY FIVE BUCKS. WTF. I left it there. Question 1: Can I use my turbo legacy MAF to test? Question 2: Anyone got a MAF they're willing to sell for $20 + shipping?

The IAC is connected. I have a MAF from the Ej22T legacy. Defninilty going to give this a shot interesting! (writes down as well) I will check. Correct. The reason I went for the MAF in the first place with no codes, is I remember fixing an EA82 that wouldnt run, the PCV valve had gone wonky and oil pressure built inside the crankcase pushing oil up into the intake plenum AND dripping all the way down into the MAF! Unplugging the MAF, and starting on a whim, allowed the car to enter limp home mode (or whenever there is a check engine light, = limp home mode) and ...allowed me to limp home. I'll go try each of these and report back! Thank you!

But! When I go unplug the MAF, the car idles just fine... but has no power under load. I tried cleaning the connector to the MAF, as well as the connectors on the MAF. Didn't spray any MAF cleaner (saw it at the store) , but was curious about it dying under load... feels like it cuts out. I just did a complete head gasket on this car, with the engine removed. The car had overheated as it was a new vehicle bought by a friend of mine. I have no idea the previous history of the car besides it showing up to my house overheated. Could I have possibly skipped a tooth on the timing belt? it seems to idle ok with no MAF connected... so i figured I timed it correctly... Ideas? Oh! and the MAF doesnt throw a code when its plugged in (and i rev it to keep it running, trying to get it to throw a MAF code with it plugged in) I have cleared the computer and the only code it throws is the MAF when its unplugged.

Thanks everyone for your replies!!! I'll go down and get a new filter asap I'm *thinking* about purchasing another blown 2.5rs and rebuilding it... not to this level... but rebuilding it to keep yet another on the road. Just over 1300 miles down and running great!

Sweet! Got my prodrive sticker in, checked my tolerances, and put the belt cover on the engine. Took some final pics What a fish sees. . . As of this moment, the car has 1200 miles on it Labour of love or whatever the @#% the saying is. Car runs PERFECT ! Mostly wanted to share with everyone on this site. When I first got here, I could barely change sparkplugs... ...now look at me Thank you everyone! I owe this build to you! *bows*

This morning I woke up nervous and excited. I pushed the car out into the driveway, pulled the carpet up, and found the magic plate. I've seen it on my turbo legacy, I just figured ... actually I just didnt think about it. Unplugged and set to go (the coil too)... I turned the engine over... ..waiting for the oil light to turn off... Doing a max set of 12 seconds per key turn, I waited for the oil light to turn off..... on the 5th set of key tuns, I still had a solid light. I figured that the assembly lube that I used and coated the metal surfaces with, would give me about 5 seconds of run time without oil being circulated if for some reason the pump wasn't functioning. Heres the oil pan and my fancy cool magnetic drain plug + group n mounts! I plug in the fuel pump, secure it, connect the coil, check the fluids for the 100,000,000th time, and sit inside the driver seat. ...and I sit. Keeping in mind I put a new fuel filter in, had the entire intake apart, and depressurized the fuel system a month before... I turn the key... after about 6 seconds,... The engine comes to life! And the oil pressure light instantly goes off!!! ...sidenote. My thoughts on the oil pressure light... I think that the starter couldnt turn the engine over fast enough to give the proper pressure to turn the light off, yet enough speed or function to allow the pump to suck up oil and transport it where it needed to be on initial startup... I allow the car to warm up, idle for a bit, and I turn it off to check the vitals. Nothing out the bottom. nothing out the top (except smoke, but a normal amount it seemed, no odd smells etc) --Insert Video of Initial Startup Here Soon!-- Everything looks great!! I then go for my break in run. I drive 1.3 miles to the location, then get to third gear for my 30-50 runs. I do 20 sets, and the engine feels GREAT! So I give her a good wash, and take her around for about 60 miles. Oil = perfect Coolant = perfect Throttle feel = perfect. Everything = perfect. I'll check tomorrow as I drive. But I believe I'm in pretty good shape. Heres some pics for a parting shot I think I might sleep in the drivers seat. . . Sub + Helmet. You never know when you'll need one!

Headed to the machine shop to drop off the wrong rings, and asked about motor oil and break in procedures. He gave me a paper he typed up from Hastings (my rings manufacturer) Engine Break-In Procedure 1) Adjust valves, carb, and ignition timing as accurate as possible before starting engine 2) Start engine and set throttle to a range of 1500-2000 r.p.m. Run engine for 15-20 minutes at this setting. Be sure to check for oil pressure, and coolant temp. 3) Shut down engine, check valve adjustment. Check fluid levels. 4) Ring break in as follows... Make a test run at 30 mph and accelerate at full throttle to 50 mph. Let engine decellerate normally back down to 30 mph. Repeat the acceleration cycle from 30 to 50 at LEAST 10 times. No further break in is necessary. If traffic conditions will not permit this, accelerate the engine rapidly several times through the intermediate gears during the check run. The Object is to apply a load to the engine for short periods of time and in rapid succession soon after engine warm up. This action thrusts the piston rings against the cylinder wall with increased pressure and results in accelerated ring seating. Change oil and filter (10w30 dino oil) after 500 miles. Then change regularly This will be my break in procedure. Well its all together as of 7:21pm tuesday night. Putting me right under 12 hours straight on it today. it sits with fluids all ready to turn over for the first time.... except... I can't find the F*ING fuse that runs the fuel pump. after burning up the last hour of sunlight looking, reading, searching. NADA. nothing. So now I need someones superior intelect to tell me which fuse is the stupid fuel pump. its not labeled, and i know the relay is way under the dash with the three... but it has to have a fuse.. i just want to build oil pressure before the initial fire.... anyone?? . . . LATER ON . . . Feelin a bit more calm, but still confused! I even got the wiring diagram and followed the fuel pump around through the ECU etc etc... no love. So lets see some pics!!!! Get that moral up! UPDATE.. Going to undo the 4 screws on the passenger floorwell in the trunk, and UNPLUG the fuel pump. Easy peasy fo sheezy.

Got it up onto my table to have it recieve its new plate. I recieved a replacement plate from arcadia25 (which looked great and would have worked for me) But i stripped out one of the screws, and they're a pain to locate.. .so i said screw it (oh man no i didnt! ha!) and picked up the new plate with ALLEN HEAD SCREWS! finally!!! Then installed my newly refinished light weight exedy flywheel with new pilot bearing (and throwout bearing, but no pic ) Then the clutch was placed (Stage 1 organic exedy) and pressure plate Ya i know its dinner time.. but lets just see if maybe i can get it buttoned up and secure... Also didnt mention the Perrin LW pulley, and Group N Motor mounts Ya i do And this is where we leave it for tonight.. Tomorrow morning leads with stopping by the dealer for two stupid vapor return lines that broke on me, getting a new fuel filter and then buttoning up the rest, filling it with oil, following the oil pressure build-up procedure (i'm just disconnecting the coil, and pulling the fuel pump relay) and turning over til the light goes out.

Good morning! Onto the next section! Got the completed shortblock onto the engine stand, and sealed up all the plugs. Did a lot more detail work... ...(like washing every... single... bolt before it went back into the block.. and using anti-sieze on anything going into aluminum, and permitex (permetex?) high temp thread sealant on bolts going into waterjackets (but that was in a previous post ) Spun the engine upside down and assembled the oil baffle and pickup Then attached the heads, Cam pulleys, oil pan, water pump, thermostat, oil pump, upper water pipe crossover guy, and other various little bits. Then sealed it up for the day. Organized the tools. it was interesting to see what you need to assemble an engine. /End day 2 And away we go with day three!! Timing components went on next, all new belt, new pulleys, new tensioner. and you can see how well the oil pan looks all clean and painted! After ensuring the timing was correct, and taking an hour or so to make sure all the valves were clearanced, we buttoned up the front Drum roll..... .......!!!! Then the intake went on So after that I went flying in a BEAUTIFUL new cirrus TURBO. mmmm What a great day! Da plane boss Bay bridge and Sf thru the fog at 3300 ft Engine building and a flight around the bay! doesnt get much better then that! back on track... I landed safely, loaded up the car, and headed back home! Heck yeah rear engine turbo legacy woop woop! Took the engine out and got it on the engine stand...

I recieved the rings the very next day around 9 am, but waited til later in the week to install because of various family gatherings. Then! it began! During the day, I would build the intake, waiting for my dad to get home to help with the pistons. Heres the intake beginning the assembly: and it completed! Ok! to the pistons!!! Numero Uno!! Oiling the next cylinder prior to insertion go dad! your light is smashing. Set-up for the next cylinder: All the pistons are in! Now for the rear main seal (since we had it up this way, made it very easy. And the end of day 1? the end of that evening anyway

The rebuild begins!!!! Parts were delivered to me late thursday. I then loaded up my turbo legacy with all the engine bits to assemble the longblock and headed south 177 miles to my parents house to assemble it with my dad. We unloaded all 43 boxes (haha) and set up our assembly table. First we took the polished crank out of the bag, and set up the connecting rods with bearings already set in place (and tolerance checked) by my machine shop. We then attached the connecting rods to the crankshaft with a generous amount of a moly-based assembly lube, and torqued to spec. Now it was time to get the block setup to recieve its newly polished crank. We took it out of the bag, fresh from the machine shop (decked, hot tanked, and bore'd 0.50 over) The machine shop also placed the main bearings and then finger-tightened a few bolts to keep the block together for transport. We split the block... We then opened up the engine reseal kit. This kit has EVERYTHING. all the little pieces of rubber, all the pieces of sticky foam, everything!!! never before has someone gotten so excited about getting new seals for waterjacket bolts. In this picture, only the o-rings and a few gaskets are shown. We then set the 1-3 side of the block down, and prepared it with RTV-UltraGrey and more assembly lube on the bearings, and placed the 4 o-rings. (the RTV looks like it touched the o-ring passages. I assure you, it does not) The Crank was then gently placed down, and the other side of the block was also prepared with assembly lube. Then the two block-halves were brought back together!! ...and torqued to spec in the proper order (per FSM) Heres a picture setting up the pistons to recieve their new rings. And the piston(s) themselves! Then. . . The Oil ring was wrong. It didnt fit. The lip that pushes out the upper and lower rings was too tall to fit inside the ringland. Keep in mind, I'm learning as I go, my dad has built many many engines, but never a subaru, but we both knew that the oil ring: A) shouldnt be snug should sit inside the ringland and the two rings and hold it in place should stick out more then the oil ring C) . . . should fit This shot you can see the lip that pushes the upper and lower ring out, not allowing the ring to enter the ringland. So!! first of all, I'd like to say that I dont blame my machine shop. I think that when the pistons were ordered, he asked for the matching set of rings, and they just mismatched them.

The A/C Bracket and power steering bracket were also stained aluminum, so I went down and got some aluminum paint (which I think is just silver that they relabel but whateva) , cleaned up the brackets and painted them. I know I know. Its totally un-necessary, but when the rest of the engine looks awesome, so will the brackets : Now onto the Intake, which I think turned out AMAZING thanks to $chumacher for the DIY article and searching for the correct paint to use. I used a self etching primer (green) and then VHT Wrinkle Red. (I know you've seen the finished product, but heres the process) This is the intake before cleaning: Then clean and masked off (which took a while) Then I primered it using 4 coats following the directions on the can: And then came the VHT Wrinkle Red. Mmm Mmm Mmmm!: after sitting for a little bit: So thats about where I'm at... Everything is CLEAN CLEAN CLEAN!!! Heres a few more random shots that were kinda cool Inside Cylinder 4 And dont even get me started when the front wheel bearing went on it.... Ugh