secondaries not opening
05-22-10, 02:53 PM
#1
secondaries not opening
looking for advice on where to begin.. the secondaries are not opening on my 85 GSL and because of this, the car is horribly slow and just not much fun t drive. the upside is that the engine runs very well and holds a good idle. i'm looking for some suggestions on what to check or where to begin to get these secondaries working. i recently rebuilt the carb and the secondaries were not opening then either. i can manually open them on the carb when the engine is running and they work just fine. any help would be most appreciated.
05-23-10, 04:26 AM
#7
there aren't any solenoids that would prevent them opening
as others said, you might as well just hook them up mechanically, remove the vacuum box and tie wire around the tabs like in that FAQ link
as others said, you might as well just hook them up mechanically, remove the vacuum box and tie wire around the tabs like in that FAQ link
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05-23-10, 09:06 AM
#10
05-23-10, 02:05 PM
#11
i replaced the diaphram because the old one looked pretty rotten...thats not to say that its any better than the old one but it did sound like it made good vacuum when depressed manually. i'm pretty sure that i installed the gaskets correctly. if i didn't would it run as well as it does...secondaries not withstanding..
05-23-10, 06:54 PM
#14
figured i'd post a video of the issue. in the video i removed the air cleaner lid and took the car around the block. i did this so that you can hear distinctly under load that the primaries are working fine but the secondaries are not. the secondary lever moves freely on both sides of the carb. ignore the maxed out oil pressure and coolant temp gauges. the capacitor wire broke today so the gauges are on the fritz.
05-24-10, 07:27 AM
#16
Lives on the Forum
Are you familiar with the "teeter totter"? That's the spring loaded rod that sits up on a little perch, but if it is not in position may cause these issues.
Mech secondaries is something you might actually like. When you press down on the gas pedal, at about the halfway point you can feel the increase in spring resistance that let's you know that you are opening the secondaries. Really helps with fuel economy if you can resist the urge to floor it all the time.
.
Mech secondaries is something you might actually like. When you press down on the gas pedal, at about the halfway point you can feel the increase in spring resistance that let's you know that you are opening the secondaries. Really helps with fuel economy if you can resist the urge to floor it all the time.
.
05-24-10, 03:22 PM
#19
If you have a hand-held vacuum pump, you can demount and test the secondary diaphragm in it's box pretty easily. Just butt the end of the vacuum hose flush over the second hole from the top.
There's a gasket that goes between it and the carb body, too, that a lot of people miss. Small, four holes in a row.
There's a gasket that goes between it and the carb body, too, that a lot of people miss. Small, four holes in a row.
05-24-10, 03:30 PM
#20
i replaced that gasket when i replaced the diaphram. the old diaphram had black liquid in it...so i snagged a good diaphram off of another carb i had laying around. when i rebuilt the carb, i used a mazda gasket set and replaced all of the gaskets applicable to the rebuild that i did. prob couldnt hurt to test the diaphram with my mityvac..
the rod with the adjuster that rests on an arm is not connected...i will connect it and screw around with the car and see what happens.
the rod with the adjuster that rests on an arm is not connected...i will connect it and screw around with the car and see what happens.
05-24-10, 03:34 PM
#21
Be interesting to see the result, as several people of vast experience (including Stirling, IIRC) have held that the throttle sub-return (teeter-totter) has nothing to do with the secondaries opening or not.
Others have disagreed. Loudly.
Others have disagreed. Loudly.
05-25-10, 03:02 PM
#25
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so if all the parts to the secondary system work, but they still dont work, then i'd try another carb too