Numbchux Posted August 29, 2006 Share Posted August 29, 2006 I thought I'd post a new thread, so those of you who actually might help don't have to sort through the play-by-play of my weekend in the garage, and I'd just give the cliff notes. anyway, I need this car running this week. school starts a week from today, and I need to have this car then. SOOO I'm getting desperate. here's the story: I have: Spark (which means ECU is getting signals from most, if not all sensors) Compression Fuel pressure to/through the rails but no combustion I've checked: power/grounds to ECU (tomorrow will double check, probably will add a couple more ground wires to the body too....) continuity between the ECU and TPS, knock sensor and all 4 injectors fuel lines are hooked up correctly to the rails for clogs in the rails (I removed the pressure regulator, put a bucket under it, and turned the ignition on, and fuel came out...) plugged the ECU into our '94 legacy, and it works fine I'm also assuming that all the sensors etc. on the engine work fine, since this engine ran awesome in the donor car before it was pulled. and it wasn't transported at all, just lifted out, it hung on the hoist for a few hours while I redrilled the flywheel, then I dropped it in the loyale. I did just realize that I never installed the O2 sensor....it's plugged in, but just sitting in the spare tire well (wires will need to be lengthened, and I forgot). would this cause my lack of fuel? I figured a bad signal is better than no signal at all, and it should at least squirt in a little fuel, but it's not firing at all....nothin... please, any help would be greatly appreciated!! Quote Link to comment Share on other sites More sharing options...
offroadsubaruguy Posted August 29, 2006 Share Posted August 29, 2006 have you checked to see if you have fuel coming out of the injectors? didnt see if you tryed it or not so thought i would ask..... Quote Link to comment Share on other sites More sharing options...
baccaruda Posted August 29, 2006 Share Posted August 29, 2006 yeah, he got that.. go over the timing belts again, it can't hurt.. make sure the left and right sprockets are on left and right.. see if there are any codes to be cleared or addressed... Quote Link to comment Share on other sites More sharing options...
homestar Posted August 29, 2006 Share Posted August 29, 2006 check your spark by spraying carb cleaner or ether into the intake and attempting to start. You'll at least know that you have it timed correctly and that the firing order is correct. Quote Link to comment Share on other sites More sharing options...
Numbchux Posted August 29, 2006 Author Share Posted August 29, 2006 yeah, he got that.. go over the timing belts again, it can't hurt.. make sure the left and right sprockets are on left and right.. see if there are any codes to be cleared or addressed... I guess I'll check that. the timing belts were done only a few thousand miles ago, and I didn't touch them when I swapped the motor over. UPDATE: the timing belts are fine. I sprayed some carb cleaner in the throttle body....and got nothing. I added a couple grounds in a couple places under the hood. made sure all my solders for crank and cam sensors had held, and weren't shorting to any adjacent wires. I'm going to have dinner, and then pull a fuel rail and see if the injectors are getting signal... truth be told, I haven't figured out how to pull codes on these Quote Link to comment Share on other sites More sharing options...
Numbchux Posted August 31, 2006 Author Share Posted August 31, 2006 IT WORKS!!! but it's 4am...full explanation of what I did to make it work tomorrow....but it took about 10hrs.... Quote Link to comment Share on other sites More sharing options...
Storm Posted August 31, 2006 Share Posted August 31, 2006 It's after 1pm now......some of us are waiting......:-\ Jay Quote Link to comment Share on other sites More sharing options...
Subarutex Posted August 31, 2006 Share Posted August 31, 2006 i'd love to hear what you found Chux. Good work getting it running. I sure hope the sound of it popping to life was rewarding! Now that the RX is 'fixed' I can again concentrate on getting the wagon running... and your symptoms sounded a lot like mine. Quote Link to comment Share on other sites More sharing options...
baccaruda Posted August 31, 2006 Share Posted August 31, 2006 hurry up and post, bro! I'm wiring my car next week and good job! Quote Link to comment Share on other sites More sharing options...
Numbchux Posted September 1, 2006 Author Share Posted September 1, 2006 well, I spent all day today putting on coolant lines, bleeding brakes, installing bumper, renewing the license tabs, etc. so I didn't get it posted up. well, first, we tested the crank and cam angle sensors, and found that when testing the A/C current generated by the cam sensor while cranking was about .5 volts at the plug on the engine, and only about .2 or so was making it to the ECU. so while it was firing, it wasn't always the right time. but we fixed that, and it didn't help, so we pulled the legacy harness out....again....set up a table (sawhorses and a piece of plywood), lots of good light, a couple pizzas, and lots of mountain dew, and 3 different versions of the wiring diagrams (one '92 FSM that I got from tex as a pdf, one FSM-based version in the Chiltons manual, and the haynes version, which doesn't have any references to which pin in the harness each wire goes to, but it has 99% correct colors!), and a complete pinout of the ECU (my buddy that was helping me works as a mechanic full-time, so he got it from the computers at work). we went through wire-by-wire, and made sure we had continuity between the ECU connector, and the other end (wherever it went form there...be it cam angle sensor, 02 sensor...or whatever), and we soldered all the connections (I had alot of crimped butt-splices....not a good idea ). then we sorted all the ign + wires out, and made sure they were all connected to the main relay somewhere. then we sorted all the batt + wires (only a couple, IIRC), and hooked them to one, fused wire that we could connect to the battery. then made sure everything that needed a ground had it. THEN, we found a discrepency....and a possibly crucial one. there's a wire, a Green one with a black stripe, that on the FSM diagram just goes to a ground on the engine. I didn't have a ground there when I had tested it before, so I spliced it in there. Well, when we had the harness back out, I traced it to the connector on the engine harness, and found that the wire doesn't come out the engine side of that harnes. so, we checked it on the ECU pinout. and it's a jumper that tells the ECU whether or not it's a California car. so if this is grounded it uses different settings for the California emissions standards. and we suspected, that it could be a different fuel/ign map, that doesn't exist on non-California ECUs....and that it confused the ECU...Anyone ever heard of that?? anyway, enough of that....here's a short clip taken at about 3:45 yesterday morning: http://video.google.com/videoplay?docid=-833013657343945103 that's with stock legacy y-pipe and midpipe, and no axle back (= 2 cats, no muffler) Quote Link to comment Share on other sites More sharing options...
Storm Posted September 1, 2006 Share Posted September 1, 2006 Glad you finally got it figured out. I don't think anyone could've guessed that solution without looking at it first hand. Isn't Subaru wiring FUN??? ~Jay Quote Link to comment Share on other sites More sharing options...
baccaruda Posted September 1, 2006 Share Posted September 1, 2006 nice work! can you give details regarding the ECU pin that corresponds to that wire? Quote Link to comment Share on other sites More sharing options...
Numbchux Posted September 1, 2006 Author Share Posted September 1, 2006 yea....who'd a thunk all that?? anyway, on the '92 FSM, the wire in question is pin C11 on the ECU. like I say, it's a Green one with a Black stripe. it goes from there to the engine harness, and you'll see, it's one of the middle ones on the smaller plug (pin 7 on F26 on the FSM). and on non-california cars, you can see it on the body side of that plug, but not the engine side! I noticed this on the harness I was working on, and thought it was way weird, so I went and looked on my dad's '94 legacy, and sure enough, same way. and the plug on the body side was NOT grounded! Quote Link to comment Share on other sites More sharing options...
baccaruda Posted September 1, 2006 Share Posted September 1, 2006 how many plugs come off of the engine for 1992, 2 or 3? my 1990 harness has three... Quote Link to comment Share on other sites More sharing options...
AKIRA Posted September 2, 2006 Share Posted September 2, 2006 not sure, my 93 harness has 2 Quote Link to comment Share on other sites More sharing options...
stinky Posted September 2, 2006 Share Posted September 2, 2006 Well done! Isn't the sound if it starting for the first time the best feeling? I also had some wiring issues when I did mine and took ages to sort out ... and just like you I had a bunch of different diagrams none which matched up perfectly to my engine/ecu but were close enough to work out in the end. congrats Quote Link to comment Share on other sites More sharing options...
Numbchux Posted September 2, 2006 Author Share Posted September 2, 2006 my 92 and 94 both have only 2. yea, the sound of it starting was awesome :headbang: anyway, I scanned the 2 pages of the ECU pinout...if someone has access to a source where very high-res pics can be hosted. that'd be awesome! I'd just put them in my photobucket account, but that resizes it so much that it wouldn't be legible, and it's already pretty hard to read. but a HUGE help!! Quote Link to comment Share on other sites More sharing options...
Storm Posted September 2, 2006 Share Posted September 2, 2006 I use webshots.com. They resize them for initial viewing but link to the original file seperately. They also include the html code to link the pics in different forums, blogs, emails, etc..... example: Jay Quote Link to comment Share on other sites More sharing options...
Numbchux Posted September 5, 2006 Author Share Posted September 5, 2006 ok..... Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.