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914World.com _ 914World Garage _ one side shakes
Posted by: itsaporsche914 Jan 13 2010, 05:27 PM
74 2 with 44 webbers. pops and back fires through the carbs. doesnt happen when idling or gettin on it. right side seems to shake though on idle. very noticeable. any ideas?
Posted by: yeahmag Jan 13 2010, 05:31 PM
You have to do your homework here... Start by adjusting the idle mixture screws. If the carbs don't respond check for a plugged idle jet. You should also verify all the standard tune up stuff; timing and valve adjustment.
Posted by: itsaporsche914 Jan 13 2010, 05:36 PM
You have to do your homework here... Start by adjusting the idle mixture screws. If the carbs don't respond check for a plugged idle jet. You should also verify all the standard tune up stuff; timing and valve adjustment.
how often do the valves need adjusting. also i know i have a intake leak. when turning the air mixture screw all the way in on just one barrel theres no change in idle
Posted by: aircooledtechguy Jan 13 2010, 05:39 PM
If it's shaking that usually means one or more cylinders are not firing (or there's no fuel to ignite. Check the plug wire routing correct order on cap and correct cylinder. Either feel for a cold exhaust pipe or pull one plug wire at a time while running to find out the offending cylinder.
Then you can determine if it's spark or fuel related.
If fuel related, I would start w/ cleaning the jets and re-setting the mixture screws. Then a full sync.
Posted by: Mark Henry Jan 13 2010, 05:41 PM
Linkage is the #1 cause of sync issues.
Posted by: aircooledtechguy Jan 13 2010, 05:42 PM
also i know i have a intake leak.
Get the vacuum leak fixed as this could be the genesis of all your problems.
when turning the air mixture screw all the way in on just one barrel theres no change in idle
A clogged idle jet will cause this. . .
Posted by: aircooledtechguy Jan 13 2010, 05:43 PM
Linkage is the #1 cause of sync issues.
Posted by: SirAndy Jan 13 2010, 07:03 PM
If you can't remember the last time the valves were adjusted, start there ...
Everything else will be a complete waste of your time if the valves are off.
Andy
Posted by: geniusanthony Jan 17 2010, 12:35 PM
If the problem is limited to just one side your floats could be set wrong, starting at the basics and working your way up will solve it. Especially if it has been awhile since the last complete tune up.
Has the car ever run right or is this ongoing? How long has it sat?
Posted by: itsaporsche914 Jan 18 2010, 06:22 AM
fixed. i took them off the car and completely took them apart to clean. ive done this twice before. kit once. i noticed one of the pump arm rollers was missing. made a couple of calls and found a shop in phoenix that had one for $20. nice guy. does sand rail and machining. these are 25 year old 44 webers. the guy said pretty good carbs. anyways i cleaned them real good put them back on and it runs like a rocket ship again. fires right up, idles and then goes. no problems. thanks for the replies
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