91 Justy dies when warm

Tiny
AMWARDELL
  • MEMBER
  • 1991 SUBARU JUSTY
  • 4 CYL
  • FWD
  • MANUAL
Just swapped engine from wrecked 91 justy to another 91 justy same year, same engine. Got it running but not quite perfect. Had to keep the gas pedal to the floor to start and then slowly, like over 10 minutes, let it my foot off in order to keep it running. It would finally settle to a nice idle, but then die. Accidentally put chainsaw oil in gas tank, so ran as much out of the gas tank as I could, replaced pump and filter with the one from the other car. Still having the same problems. Yesterday it started right up after I swapped a part, not sure what it was, just some tubes that come off the carb into little relays or something, and I adjusted the idle and let it run. It ran for about 10 minutes then died and I couldnt start it without putting my foot to the floor again.
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Wednesday, April 6th, 2011 AT 4:44 PM

24 Replies

Tiny
FIXITMR
  • MEMBER
Any way to check fuel pressure? Has that got a carb or throttle body?
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Wednesday, April 6th, 2011 AT 6:39 PM
Tiny
AMWARDELL
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Its a carb. I could buy a pressure checker thingy.
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Wednesday, April 6th, 2011 AT 6:50 PM
Tiny
FIXITMR
  • MEMBER
With a carb, exact pressure is not to important. Just loosen line at carb and make sure it's working.
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Wednesday, April 6th, 2011 AT 11:01 PM
Tiny
AMWARDELL
  • MEMBER
Its getting fuel because it will run at times and not at others. At a certain point in trying to adjust the carb the car would start and rev up and down by itself, with the idle really high. What makes changes in the idle speed like that on a carbureted vehicle? Also when I have to have my foot planted for it to start, I can keep it running at redline, then slowly take my foot off and theres a point about an inch from the floor where it just stops getting fuel it seems all of a sudden.
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Thursday, April 7th, 2011 AT 12:00 AM
Tiny
AMWARDELL
  • MEMBER
There is one vacuum hose thats not connected its the return line from the vacuum canister to the fuel tank I cant find where it connects.
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Thursday, April 7th, 2011 AT 12:01 AM
Tiny
FIXITMR
  • MEMBER
What do you mean by adjust the carb? Take plugs out and see what color the tips are. Black=rich brown=good white=lean.
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Friday, April 8th, 2011 AT 4:44 AM
Tiny
AMWARDELL
  • MEMBER
They were black so I replaced them and tried resetting it.
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Friday, April 8th, 2011 AT 3:39 PM
Tiny
FIXITMR
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Running way to rich, now just got to figure out why. Is there a butterfly/plate style choke on carb?
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Friday, April 8th, 2011 AT 5:03 PM
Tiny
AMWARDELL
  • MEMBER
Im not sure. I went to start the car today and a bunch of gas shot out the exhaust and its filling up the crankcase and spewing out the little hose that goes from the valve cover to the air filter and its all mixed with the oil.
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Friday, April 8th, 2011 AT 6:55 PM
Tiny
FIXITMR
  • MEMBER
Yikes, sounds you got a real mess on your hands. Be nice if you had access to a similar car to check all your connections. I still dont know what you mean by adjust carb? And maybe you got yourself a bad motor? I always like to hear them run before I switch them.
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Saturday, April 9th, 2011 AT 6:02 PM
Tiny
AMWARDELL
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I drove the car before I swapped the motors and it ran fine. Theres a screw on the back of the carburetor that if you screw in I believe it makes it rich and out makes it lean. It will run on its own if I screw it almost all the way in. Do you know where the vapor return line goes? Its the vacuum line that connects the vapor canister to the fuel tank, I cant find where it hooks up so its loose. If you had pictures thatd be great, the diagrams dont help.
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Saturday, April 9th, 2011 AT 7:12 PM
Tiny
FIXITMR
  • MEMBER
If your crankcase is filling with gas you probably have a float not working properly and it's overspilling into intake this would account for too rich. I wonder if that screw is either air adjust or float adjust?
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Sunday, April 10th, 2011 AT 11:03 PM
Tiny
AMWARDELL
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Ill check the manual and let you know. If it isnt, then should I rebuild the carb?
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Sunday, April 10th, 2011 AT 11:34 PM
Tiny
FIXITMR
  • MEMBER
But it was working ok before the switchover?
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Monday, April 11th, 2011 AT 10:27 PM
Tiny
AMWARDELL
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Yes. And a couple of times it worked fine after, but died after running for about 10 minutes
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Monday, April 11th, 2011 AT 11:46 PM
Tiny
FIXITMR
  • MEMBER
What about switching carb from old engine?
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Tuesday, April 12th, 2011 AT 3:08 AM
Tiny
AMWARDELL
  • MEMBER
The old engine is long gone unfortunately
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Tuesday, April 12th, 2011 AT 3:25 AM
Tiny
FIXITMR
  • MEMBER
Have you thought to do a search for subaru forums? I'm finding that the older stuff is getting left behind and ignored mostly in many different car types.
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Tuesday, April 12th, 2011 AT 4:14 AM
Tiny
AMWARDELL
  • MEMBER
Ive spent HOURS in subaru forums
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Tuesday, April 12th, 2011 AT 7:45 AM
Tiny
FIXITMR
  • MEMBER
So did you determine if the choke is the problem?
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Tuesday, April 12th, 2011 AT 8:33 AM

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