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Idleing high 1980 brat
Posted 25 August 2013 - 08:17 AM
Posted 25 August 2013 - 08:40 AM
Years back picked up a great condition low mileage GL hatchback for a few bills because it wouldn't idle and could not be driven over twenty mph. The cause was a bad PCV and clogged breather hoses.
Posted 25 August 2013 - 08:44 AM
Posted 26 August 2013 - 11:29 AM
Check your vacuum hoses, leaks result in high idle and cutting out if you try to lower it
Posted 26 August 2013 - 01:44 PM
Posted 26 August 2013 - 01:46 PM
rev the motor while you check. they are probably ported vacuum so they increase the vacuum with engine speed rather than being max at idle.
Posted 26 August 2013 - 01:55 PM
Posted 26 August 2013 - 03:20 PM
Not the ported lines, check for any lines that go under the manifold where the rubber hoses connect to metal. Sometimes you can hear the leak.
Posted 26 August 2013 - 04:26 PM
Posted 26 August 2013 - 10:03 PM
Posted 27 August 2013 - 09:08 AM
Take off top of carb and unscrew them doubt is you problem check intake gaskets are they factory subaru only ? also check that choke is pulling off and idle curcit in carb have had luck putting my hand over the top at high rpms thiss will stall it but pulls the crap outa the bottom of carb may have to do it more than one time but seems to work on old hitachis
Posted 27 August 2013 - 03:57 PM
Posted 28 August 2013 - 09:26 AM
choke should be closed cold and move to fully open as it warms up also should be a good power signal at choke + post
Posted 28 August 2013 - 10:57 PM
Posted 29 August 2013 - 09:46 AM
I dont remember off hand but shure a manual will have a good blow up pic of carb i think its in the lower half
Posted 29 August 2013 - 01:25 PM
Posted 29 August 2013 - 04:00 PM
There are two vacum lines in the front but dont feel like they have any vacum or suction on em? One goes into carb by a nipple
Are you saying that the two vacuum ports on the front of the carb are not being used and are not capped? Both ports should have a nipple btw.
If the idle mix screw has no effect on the idle quality or speed, and everything else is intact, then it means you have by-passed the idle-circuit in the carb. The idle mix screw should be roughly two full turns out from being lightly seated plus or minus a half turn.
Most likely you have some vacuum leaks. If you messed with the fast idle screw on the carb, that can complicate matters as well.
Since you rebuilt the carb and idle/driveability issues still persist, you probably need to check all vacuum lines coming off the manifold (brake booster, charcoal canister valve, canister purge line, etc,..) as well as the intake manifold gaskets.
Does the behavior change as the engine warms up?
Edited by ferox, 29 August 2013 - 04:01 PM.
Posted 29 August 2013 - 05:17 PM
Posted 29 August 2013 - 05:18 PM
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