1986F150Six

Look for a kinked cable or something binding. Have you done any mechanical work in the area of the cable lately? Have you installed a different air cleaner or done any choke adjusting?

Disconnect the cable. That is a good start.

Believe me when I say it is a gift! I wish I could help regarding the electrical questions... I look forward to what the others with more knowledge of this type suggest!

Regarding the belt theory, Gary, I found this: [food for thought?] http://updateinternational.com/Book/VibrationBook13a.htm Practical Solutions to Machinery and Maintenance Vibration Problems Chapter 13, Additional Vibration Sources Section 1, Vibration Due to Pulleys/Sheaves and Drive Belts Sometimes the length and tension on a drive belt results in a resonance within the belt whereby it acts like a resonant string. The resonance mode shape usually can be seen with a strobe after putting a chalk mark along the edge of the belt and watching it while vibrating. The belt will appear to vibrate in a mode shape typical for a specific resonance (most often, the 1st resonance mode, but for very long belts, the 2nd resonance mode occasionally occurs). This is not to be confused with vibration due to an unbalanced belt. Almost all variations of shaft-to-shaft pulley misalignments result in higher than usual axial vibration. Sometimes the primary frequency is at 2 x rpm, but more often it is at 1 x rpm. Multiple V belts with unequal tensions also cause a high axial vibration. Sometimes the rigidity of the support system prevents it from being measured or seen, but pulley/sheave misalignment very often causes excessive thrust bearing wear. Replacing with belts of equal tension will usually cure the problem. Multiple belts molded in one piece are supposed to prevent this problem but do not if the sheaves are misaligned. Drive and driven pulleys with multiple or single belts should be in the same line of action or in the same plane. If not in the same plane through cocking of one sheave relative to the other, or if parallel but not in alignment, then excessive vibration results. Proper alignment in the same plane cures the problem. Make sure that the grooves are aligned rather than basing alignment on the sides of the pulley. Although relatively rare, a poorly made belt can within itself be out of balance. This results in excessive vibration at the low frequency of 1 x rpm of the belt (not of the rotor). Pulley/sheave eccentricity results in a vibration frequency of 1 x rpm of the eccentric pulley/sheave. However, it can be distinguished from an unbalanced rotor. For example, an unbalanced sheave will show the usual characteristic of relatively equal amplitudes in both the horizontal and vertical directions. However, an eccentric sheave will show its largest amplitude in the direction of the line connecting the drive and driven sheaves. For an unbalanced sheave, readings taken at the same bearing in directions 90° to each other will show an approximate 90° phase relationship. However, for an eccentric sheave, phases measured at the same bearing in directions 90° to each other will show a phase relationship of either approximately 180° or 0°. This is similar to what is often seen due to coupling/shaft misalignment.

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Search for Mystery Components [10/22/18] Oct 22, 2018; 4:07pmRe: Mystery Components 85lebaront2 Administrator 3010 posts First item is an air valve, used on A/C equipt vehicles to admit extra air into the intake under high temperature conditions, it is thermally controlled by a bimetal spring. Second was your choke hot air tube, but most of these engines didn't use a hot air choke, it was electric heated by the 7 volt stator feed from the alternator. Bill Profile "Getting old is inevitable, growing up is optional" Darth Vader 1986 F-350 460 converted to MAF/SEFI, E4OD 12X3 1/2 rear brakes, traction loc 3:55 gear, 160 amp 3G alternator Wife's 2011 Flex Limited Daily Driver 2009 Flex Limited with factory tow package Project car 1986 Chrysler LeBaron convertible 2.2L Turbo II, modified A413 LARIAT 85Reply | Threaded | More Selected postOct 22, 2018; 5:28pmRe: Mystery Components LARIAT 85 373 posts This post was updated on Oct 22, 2018; 5:38pm. In reply to this post by baddog8it The first component is called a Hot Idle Compensator Valve (HICV on your emissions diagram.) When the engine is hot, the air/fuel mixture is richer than normal. The HICV opens slightly to let in a little bit of air into the intake and below the throttle valve to lean out the mixture at idle to compensate for the richer mixture. The second component looks like a broken choke tube. Most Fords of this era used a thermostatic choke with electric assist. If that plate is bolted to the intake manifold, a tube was originally inserted in it to operate the choke. One end serves as a fresh air tube that connects to the carburetor air horn, the other a hot air tube that screws onto the choke assembly. The choke works in lockstep with the coolant temperature. As the coolant heats up, the tube also heats up and begins to open the choke. Full operating temperature = fully opened choke. (Small block engines used a chamber on the passenger's side exhaust manifold and uses the temperature of the exhaust to accomplish the same thing.) You should also have a wire connecting the choke cap to the back of the alternator. That would be the electric assist. It only works above about 60 degrees to help the choke come off faster. If the thermostatic choke isn't hooked up properly, you will have cold start problems if it temperatures are less than 60 degrees. Lucille: 1985 Ford F150 XLT Lariat *Colors: Dark Canyon Red exterior, Canyon Red interior *Engine: 5.0, CompCams 31-230-3, "Thumper" E7 heads, Edelbrock Performer intake, Autolite 4100 carburetor, DuraSpark II ignition, Thorley Tri-Y headers, Flowmaster dual exhaust, H-pipe. *Drivetrain: AOD transmission, 3.55 gears, 2wd.

Good work and idea! I personally do not care for the bull nose with ring. Thanks for your efforts!

I think the loose emblem could certainly have contributed to the drone. I bet the 3600 RPM vibration is v-belt related; either a long belt or something driven by the belt(s).

https://www.rearcounter.com/D30Z-18599-B-parts983838.html Ooops! I just noticed the - A vs. what I found: - B. Sorry!

Good job and very nice truck!

Wow! Nice truck!

Welcome, Aaron!

Yes, welcome!

SOLD!

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Rough, but low price: https://www.ebay.com/itm/Pickup-Truck-Bed-Take-Off-Ford-1980-1986-F100-F150-F250-8-Foot-For-Parts-Restore/193774204044?hash=item2d1dd7b48c:g:uVQAAOSw6aFfeR3~

Welcome!

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