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Holley tuning troubles.
Posted 30 January 2009 - 11:13 PM
New fuel pump + filter 3psi fuel pressure +/- a hair.
I have checked 300 times for vacuum leaks. Everything is now plugged including brake booster. I have also sanded the adaptor plate and base of carb flat. Sprayed carb cleaner all over the place, nothing.
The cat is only 3 months old.
Gas looks fine, recent fill up... Could it be bad? I started thinking mabe that little coolant port under the carb adaptor was leaking (long shot) so I popped off my radiator cap to check the level, and I found foam/bubbles. Could a bad head gasket be screwin' with me? Car does not over heat. Ive had enough for today, any Ideas?
Posted 30 January 2009 - 11:24 PM
Posted 30 January 2009 - 11:31 PM
Posted 30 January 2009 - 11:38 PM
Manual or electric choke?
Sounds to me like an idle circute malfunction.
Posted 30 January 2009 - 11:56 PM
Posted 31 January 2009 - 12:39 AM
Posted 31 January 2009 - 01:17 AM
Either have it properly reamed and rebushed by a machine shop, or get a new carb. You'll tear your hair out till you do.
Posted 31 January 2009 - 02:49 AM
That may explain why the unit I "ghetto bushed". But the second carb I put on does drive better. But I cannot get it to idle less than 1100 rpm. This carb is used though, but in good shape. My transition port is a slot.
Posted 31 January 2009 - 12:39 PM
But I cannot get it to idle less than 1100 rpm. This carb is used though, but in good shape. My transition port is a slot.
Make sure the plate is closing fully and that there are no burrs or other damage to the idle jet and that it fits well into the holder, etc. Not idling back should be a simple thing to diagnose - you are getting air and fuel from somewhere. Either the plate is not closing or there's a problem with the idle jet or the transition slot is too exposed below the plate. You have to carefully set up where the plate lands when you put the carb together or it just won't idle or transistion properly. The trans. slot should be fully above the plate when it's closed.
Posted 31 January 2009 - 12:42 PM
I used to have a bunch of sites on these, but I deleted them now that I have an FI sube.....
I sounds like it's too rich, or the throttle plates are open too far.
I've used a Holley 5200 before, set it up with the proper jetting for a weber, and it was fine. With the larger carb, you may need to adjust your timing too. Did you install a fuel pressure regulator? I think they like 1.5 psi.
Posted 31 January 2009 - 05:08 PM
I just put on the 3rd which is not rebuilt and has not been rebushed, has the slot setup. The idle screw can be adj. till the engine stalls. But, the idle jetting on this unit is not adjustable, and its too rich.
Posted 31 January 2009 - 08:07 PM
Posted 01 February 2009 - 07:24 PM
Posted 02 February 2009 - 10:39 AM
I think My setting were 55 jets and 1 1/2 turns out fuel side and 2 turns out air side
Posted 02 February 2009 - 03:41 PM
Bore of the carbs/throttle plates are the source of my troubles for sure. I held the bores up to the sun with the plates closed tightly. The 2 factory reman ones no matter how hard I try I cant get light to not peak through just a tiny bit when the plates are closed. The J-Y unit I tried all 3 plates in it and with just a little adj. and a couple blips all 3 center perfectly and allows no light to creep through. This must just be a wear factor, and or a problem with the bushings. On a 2.5l motor I bet this small imperfection may not be as big a deal, but on these little motors its just screwing me all up.
Moral of the story. Facotry REBUILT carbs are junk. The things I found wrong with these, throttle shafts have excessive play after rebushing. One of them had a mangled emulsion tube. They obviously had trouble with it at the shop and just let it go. One of them was missing the idle jet. The holder was there but no jet... For anyone searching for info Holley 5200 5210 6500 etc, it is the luck of the draw as to what you will get. Save your money and time get the Weber kit or fix the Hitatchi.
Posted 02 February 2009 - 03:47 PM
Posted 03 February 2009 - 12:36 AM
Posted 12 February 2009 - 01:09 AM
GD has a very good point... for the money you'd spend on getting your carb'd setup up and running, you could very well have a decent FI going in your favor... Do you have anything against going electronic? (I only ask, cause there are some "ALL CARB" devotees out there...)
It may be more worth your time and money to convert to a Fuel Injected system, and this could definitely save you a lot of time and hassle in the long run....
Posted 12 February 2009 - 06:28 PM
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