Auz23 Posted October 23, 2019 Share Posted October 23, 2019 Hey team I have a 1991 Subaru liberty/legacy Gx and ive had a couple of issues with it the first symptom appeared maybe 6 months ago, accelerating up a hill at roughly 90km/h to 100 km/h and the engine just lost all of its power and started shaking - all levels were fine etc. pulled over for 2 minutes and drove the car home no problems This has re-occurred at random at highway speeds (100km/h or 60mph) 3 times since, but the more noticeable day to day symptom is a rough idle when in drive/reverse, when I flick it to neutral/park the vibrations go away. Its been a real head-scratcher for me, and the mechanic had no idea what it was either, he suggested it could be the cam angle position sensor but I checked that with my multimeter and the sensor and connector were fine anybody have any ideas what this could be?? Link to comment Share on other sites More sharing options...
el_freddo Posted October 23, 2019 Share Posted October 23, 2019 Dying fuel pump? Bad spark plug could do it maybe. Does your check engine light illuminate when the engine isn’t running but the ignition is ON? How many km on it? Cheers Bennie Link to comment Share on other sites More sharing options...
el_freddo Posted October 23, 2019 Share Posted October 23, 2019 Or a dirty AFM. Link to comment Share on other sites More sharing options...
forester2002s Posted October 23, 2019 Share Posted October 23, 2019 or a partially-clogged fuel-filter? Link to comment Share on other sites More sharing options...
Auz23 Posted October 23, 2019 Author Share Posted October 23, 2019 7 hours ago, el_freddo said: Dying fuel pump? Bad spark plug could do it maybe. Does your check engine light illuminate when the engine isn’t running but the ignition is ON? How many km on it? Cheers Bennie Yeah the CEL illuminates when the ignition is on, on that I actually plugged in the read memory port and it spat out a code for a crank position sensor? Unsure if that's relevant because it's apparently a historical code, the user - diagnosis showed nothing It has 160k km on the clock, not too much for a 1991 Link to comment Share on other sites More sharing options...
Auz23 Posted October 23, 2019 Author Share Posted October 23, 2019 7 hours ago, el_freddo said: Or a dirty AFM. I'll check that and my spark plugs, any ideas on how I should go about checking the pump? 7 hours ago, forester2002s said: or a partially-clogged fuel-filter? That I will check asap Link to comment Share on other sites More sharing options...
el_freddo Posted October 23, 2019 Share Posted October 23, 2019 If that was a historical code I’d be clearing that ASAP. The crank angle sensor could cause a cut out issue, I’ve not know them to create a hesitation, just loss of all power/rpm until the engine stalls. The crank angle sensor could be the issue, while rare, it could be a good avenue to look into. Go second hand. Cheers Bennie Link to comment Share on other sites More sharing options...
Auz23 Posted October 23, 2019 Author Share Posted October 23, 2019 52 minutes ago, el_freddo said: If that was a historical code I’d be clearing that ASAP. The crank angle sensor could cause a cut out issue, I’ve not know them to create a hesitation, just loss of all power/rpm until the engine stalls. The crank angle sensor could be the issue, while rare, it could be a good avenue to look into. Go second hand. Cheers Bennie I unclipped the sensor last night to test with a multimeter, plugged it back in and today while driving I had 3 absolute stalls and lots of uneven rpm (only drove around 1km then went home because I was worried about the stalling). The wiring was fine from the multimeter test so should I assume that sensor needs replacing? Link to comment Share on other sites More sharing options...
el_freddo Posted October 24, 2019 Share Posted October 24, 2019 It could be sensor or it could be a break in the wiring from the sensor to the main loom, you’ll need to check this out and determine which one it is. Cheers Bennie Link to comment Share on other sites More sharing options...
Auz23 Posted October 24, 2019 Author Share Posted October 24, 2019 1 hour ago, el_freddo said: It could be sensor or it could be a break in the wiring from the sensor to the main loom, you’ll need to check this out and determine which one it is. Cheers Bennie thanks mate! I just checked the terminal wiring and found that there is continuity flowing through but no constant 5-12v when the key is in the on position, getting 0.05 dcv through all of them, assuming that is nothing major probably the constant power wire, must be a break somewhere thanks mate Link to comment Share on other sites More sharing options...
GeneralDisorder Posted October 24, 2019 Share Posted October 24, 2019 Plugs and wires. GD 1 Link to comment Share on other sites More sharing options...
idosubaru Posted October 24, 2019 Share Posted October 24, 2019 +1 to GD. plugs and wires. use NGK or subaru only. 1 Link to comment Share on other sites More sharing options...
naru2 Posted October 24, 2019 Share Posted October 24, 2019 On 10/23/2019 at 12:17 AM, Auz23 said: accelerating up a hill at roughly 90km/h to 100 km/h and the engine just lost all of its power and started shaking anybody have any ideas what this could be?? Fuel pump. 1 Link to comment Share on other sites More sharing options...
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