80-96-list-digest Thursday, May 7 1998 Volume 02 : Number 160



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Ford Truck Enthusiasts - 1980-1996 Trucks and Vans
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In this issue:

FTE 80-96 - H*lp: Carb troubleshooting - Long
FTE 80-96 - F-250 Farm Truck

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Date: Wed, 06 May 1998 23:41:51 -0400
From: Ken Payne
Subject: FTE 80-96 - H*lp: Carb troubleshooting - Long

Forwarded for Randy :

Ok gang here's a carb question for you carb experts out there. I have
alot of knowledge on engines, but am almost clueless when it comes to
carberators so here it is:

Subject: '87 F-250HD 4x4 351HO 4bbl Holley (Motorcraft/Holley E6HE-GB)
Previous symptoms: Was leaking fuel around the power valve cover for
awhile and was getting worse. Also had bad valve cover gasket oil
leak so, I thought while I had all that stuff (hoses, air cleaner,
etc.) out of the way, I'd take a gander at the leak and at least
replace a gasket, I mean, I'm most definitely a mechanically inclined
guy, I can figure this thing out.....right?
Work done: Removed carb from motor, hook-ups to this carb include
wire to choke ass'y, large vacuum lines into top of float bowls front
and back, one large vacuum line to lower plenum in front below primary
float bowl and one small one next to that. One more vacuum line next
to the primary float bowl on top right (correct right, as in sitting
in driver's seat) of the bowl (opposite the fuel inlet) and, of course
acc cable and kick down bar (auto).
Work, continued: Removed both float bowls, metering plate
(secondary), and spacer between main body and primary float bowl.
Replaced both needles and adjusted dry (turn bowl over and align top
of float parallel to top of bowl). Replaced the Economizer, but made
no adjustments there, don't even know if necessary, but the inner
threaded section was at a different length than the one I pulled out.
Replaced the secondary vacuum actuator diaphram and the power valve
diaphram and reassembled. Put carb back onto manifold and fired it
up. It took alot of pedal to start and ran like crap once started.
Had to keep slight pressure on pedal to keep from stalling. I guess I
would describe the sound as one hell of a large cam. Bap, bap...bap,
bap...bap, bap... Also smelled alot of gas.
More work: Removed carb again and tore down same as before (except
not the metering plate this time) and put my old Economizer back in.
Other adjustments: Readjusted needles, adjusted vacuum lever for
secondaries, adjusted choke release and put carb back on truck.
WOOHOO: Truck fired right up into fast idle (had to kick pedal to
decrease...back to normal, right?...). Revved up just fine and very
smooth and could hear secondaries open up (major suckage sound).....

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