Crawlerdan Posted November 9, 2012 Share Posted November 9, 2012 ive owned 109 subarus, this ones weird for sure 1992 legacy auto fwd will not start belongs to a friend, said that it wouldnt start, hit it with starting fluid for a few weeks, and that worked, now that doesnt work ive noticed the following-brand new coolant temp sensor both fans on, all the time, running or not, cold or hot iac valve doesnt look horrible, but..... it has spark, getting fuel. compression is 125ish at all 4 i got it to start tonight- horrible shuddering idle, but all 4 firing, idle at 2k rpm, will restart fine after its warm. but cold start is a no go maybe timing skipped a tooth?.....odd one what thinks the land of soobies:D Quote Link to comment Share on other sites More sharing options...
Ricearu Posted November 9, 2012 Share Posted November 9, 2012 (edited) Maybe a bad mass airflow sensor? just maybe. unplug it and see if it acts any different. I have seen a bad maf make a car run real funny. in fact thinking back, spraying starting fluid may have actually done the hot wire filament in the maf in for good. they can't take the solvents. Edited November 9, 2012 by Ricearu Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted November 9, 2012 Share Posted November 9, 2012 ive owned 109 subarus, this ones weird for sure 1992 legacy auto fwd will not start belongs to a friend, said that it wouldnt start, hit it with starting fluid for a few weeks, and that worked, now that doesnt work ive noticed the following-brand new coolant temp sensor both fans on, all the time, running or not, cold or hot iac valve doesnt look horrible, but..... it has spark, getting fuel. compression is 125ish at all 4 i got it to start tonight- horrible shuddering idle, but all 4 firing, idle at 2k rpm, will restart fine after its warm. but cold start is a no go maybe timing skipped a tooth?.....odd one what thinks the land of soobies:D i'd say your skipped tooth is a possibility - especially if it seems doggy when driven. Quote Link to comment Share on other sites More sharing options...
johnceggleston Posted November 9, 2012 Share Posted November 9, 2012 check the timing and try it with the coolant temp sensor unplugged. Quote Link to comment Share on other sites More sharing options...
porcupine73 Posted November 9, 2012 Share Posted November 9, 2012 Hm yes at the least the both fans staying on all the time is suspicious. I know it will do that as a failsafe if the sensor is disconnected. But if that sensor is way out of spec and the ECU thinks the coolant temp is actually say 205F when it is really 30F it's probably not going to inject enough fuel for it to run, so maybe the starter fluid helps it out a bit. That might also explain why it will restart ok if the engine is warm. Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted November 9, 2012 Share Posted November 9, 2012 No CEL? Which temp sensor is new? The one wire or the two wire? Checked the test mode plugs under the dash? Quote Link to comment Share on other sites More sharing options...
Crawlerdan Posted November 9, 2012 Author Share Posted November 9, 2012 Maybe a bad mass airflow sensor? just maybe. unplug it and see if it acts any different. I have seen a bad maf make a car run real funny. in fact thinking back, spraying starting fluid may have actually done the hot wire filament in the maf in for good. they can't take the solvents. i thought this also, i have a good one on hand, no change Quote Link to comment Share on other sites More sharing options...
Crawlerdan Posted November 9, 2012 Author Share Posted November 9, 2012 No CEL? Which temp sensor is new? The one wire or the two wire? Checked the test mode plugs under the dash? the two wire is new, no cel....but not light at all, bad bulb or no bulb i suspect;) will update Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted November 9, 2012 Share Posted November 9, 2012 I would check for codes first, and also check the green test mode and black? diagnostic/reset plugs under the dash. They should both be unplugged. Quote Link to comment Share on other sites More sharing options...
Crawlerdan Posted November 9, 2012 Author Share Posted November 9, 2012 someone pulled the CEL bulb, haha 21 22 24 30 31 32 49 Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted November 9, 2012 Share Posted November 9, 2012 (edited) 1988 and later models with Multi-Point Fuel Injection (including Legacy) 11 Crank angle sensor or circuit 12 Starter switch or circuit 13 Cam position sensor or circuit (TDC sensor on Justy) 14 Fuel injector no. 1 (Legacy, Impreza, Justy, SVX); Fuel injector 1 and 2 (XT, Loyale, GL, DL) 15 Fuel injector no. 2 (Legacy, Impreza, Justy, SVX); Fuel injector 3 and 4 (Loyale, GL, DL); Fuel injector 5 and 6 (XT6) 16 Fuel injector no. 3 (Legacy, Impreza, Justy, SVX); Fuel injector 3 and 4 (XT) 17 Fuel injector no. 4 (Legacy, Impreza, SVX); Fuel injector 1 and 2 (XT6) 18 Fuel injector no. 5 (SVX) 19 Fuel injector no. 6 (SVX) 21 Coolant temperature sensor or circuit 22 Knock sensor or circuit (right side on SVX) 23 Air flow meter or circuit (exc. Justy); Pressure sensor (Justy) 24 Air control valve or circuit (exc. Justy); Idle speed control solenoid valve (Justy) 25 Fuel Injector 3 and 4 (XT6) 26 Air temperature sensor (Justy) 28 Knock sensor no. 2 (SVX, left side) 29 Crank angle sensor (SVX, no. 2) 31 Throttle position sensor or circuit 32 Oxygen sensor or circuit (no. 1, right side on SVX) 33 Vehicle speed sensor (VSS) or circuit 34 EGR solenoid valve 35 Canister purge solenoid or circuit 36 Air suction solenoid valve (Impreza); Igniter circuit (Justy) 37 Oxygen sensor (no. 2, left side , SVX) 38 Engine torque control (SVX) 41 Air/fuel adaptive control 42 Idle switch or circuit 43 Throttle switch (Justy) 44 Wastegate duty solenoid (turbo) 45 Pressure duty solenoid (turbo)/atmospheric pressure sensor circuit (non-turbo) 49 Airflow sensor 51 Neutral switch (manual transmission)/inhibitor switch (automatic transmission) 52 Parking brake switch (exc. Justy)/Clutch switch (Justy) 55 EGR temperature sensor 56 EGR system 61 Parking brake switch (Loyale)/Fuel tank pressure control solenoid valve (Impreza) 62 Fuel temperature sensor (Impreza)/Electric load signal (Justy) 63 Fuel tank pressure sensor (Impreza)/Blower fan switch (Justy) 65 Vacuum pressure sensor your 30 is weird, at least, there's no 30 for any soob at the above site. clear them out and see which ones come back immediately. from troublecodes.net Edited November 9, 2012 by 1 Lucky Texan Quote Link to comment Share on other sites More sharing options...
Ricearu Posted November 9, 2012 Share Posted November 9, 2012 reset and see what reappears. If they all reappear, then you may have a bad ECU, not sending out it's 5vdc reference signal. all those sensors besides the 02, run on 5v. Also, you could have a bad ground to or in the ecu. Quote Link to comment Share on other sites More sharing options...
Crawlerdan Posted November 9, 2012 Author Share Posted November 9, 2012 i cleared the, only one that came back right away was IAC Valve, i cleaned it- we'll see what that does Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted November 9, 2012 Share Posted November 9, 2012 Kinda seems like someone went along unplugging sensors to see what would happen. Or someone had the engine out and left the main harness unplugged. If the ECU gets no signal from the crank sensor you get no spark. They typically fail intermittently only when warm. If it were bad I would expect the engine to not start at all. Quote Link to comment Share on other sites More sharing options...
Crawlerdan Posted November 10, 2012 Author Share Posted November 10, 2012 ok guys- i hate seeing things left unanswered.i fixed it i removed the iac, thoroughly cleaned it with brakleen, sea-foamed it and the car, reset the ecu. problem solved. started in 3 cranks at 12deg this morning Quote Link to comment Share on other sites More sharing options...
wentz912 Posted November 11, 2012 Share Posted November 11, 2012 Does the IAC affect warmed up engine operation at all? Have a miss/stumble that only appears after the engine has warmed up. Occasionally throws a code for misfire on #2 and #3 Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted November 12, 2012 Share Posted November 12, 2012 Iac doesn't typically cause misfires. When is the last time you did a tune up? Quote Link to comment Share on other sites More sharing options...
Crazyeights Posted November 12, 2012 Share Posted November 12, 2012 Have you verified that the fuel pressure is correct with gauge? Quote Link to comment Share on other sites More sharing options...
wentz912 Posted November 13, 2012 Share Posted November 13, 2012 Have brand new NGK plugs and wires, as well as a diffrerent coil off another car. Also brand new fuel filter and oil change. Thing runs fine most of the time, just seems to stumble when loaded at lower rpm's after warmed up. If I punch it , it will burble through the stumble and pull just fine. It's the damnedest thing, can't figure it out. Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted November 13, 2012 Share Posted November 13, 2012 Could be a bad o2 sensor. Might try cleaning the MAF sensor if it has it. PCV valves are known to cause strange issues as well so if that hasn't been replaced it should be. Make sure all vacuum hoses are in good shape and the breather and PCV hoses are clear of obstruction and connected properly. One other option is the timing belt. If it has jumped one tooth the car may still run fine cold but have issues when warm. Quote Link to comment Share on other sites More sharing options...
wentz912 Posted November 13, 2012 Share Posted November 13, 2012 It's a 96, so it is an MAF car, will jump on the pcv change. Have checked timing several times and is still dead nuts. Easy yo check since im coverless Quote Link to comment Share on other sites More sharing options...
porcupine73 Posted November 13, 2012 Share Posted November 13, 2012 Maybe unplugging the front o2 sensor connector and then see if the same thing happens or not after it warms up. That way if it doesn't do it after it warms up with the front o2 unhooked that might be your issue. Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted November 13, 2012 Share Posted November 13, 2012 It's a 96, so it is an MAF car, will jump on the pcv change. Have checked timing several times and is still dead nuts. Easy yo check since im coverless Do you have a scanner that can read live data, or display freeze frame data? Quote Link to comment Share on other sites More sharing options...
wentz912 Posted November 14, 2012 Share Posted November 14, 2012 I don't have a scanner at all. When I get back to town I will see if the guy with a scanner I know, if his is capable of that. Just so I understand, what am I looking for? Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted November 14, 2012 Share Posted November 14, 2012 Basically anything out of the ordinary. Are the O2 voltages within spec? (The front sensor, Bank 1 sensor 1, is the one that controls fuel/air mixture). Fuel trims should be somewhere around 10% to -10%. (The reading will be positive or negative depending on if the ecu is adjusting towards rich or lean A/F ratio. Beyond 10% can mean the sensor is bad. Are any other sensor readings out of spec? Coolant temp, MAP/baro pressure/vacuum, MAF flow rate, that sort of thing. 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.