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Bad vibration at idle worse with new A/C on.

Tiny
BILLHERRRING
  • MEMBER
  • 1981 FORD F-100
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 82,000 MILES
Truck has 300 6 cyl and has be completely serviced and tuned by very skilled mechanic. Has new wires, plugs, carb, intake gasket, Motor mts, A/c compressor and many other maintenance parts. Truck runs great at road speed but at stop light it has a heavy vibration ang gets worse. Harmonis balancer and flywood have all been inspected. HELP
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Sunday, August 30th, 2015 AT 8:58 AM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check valve adjustment may have come out of adjustment since rebuild. Put a chalk mark across front of balancer if you can rev motor and see if chalk marks stay together if not the rubber in balancer may have broken. Also if dual belts meaning they both adjust same things may not be tight enough or are not a matched set as they must be as well as wrong flywheel or a weight broke off of flywheel.
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Sunday, August 30th, 2015 AT 9:15 AM
Tiny
CJ MEDEVAC
  • MECHANIC
  • 11,004 POSTS
WAS THE VACUUM ADVANCE HOSE TO THE DISTRIBUTOR REMOVED AND PLUGGED OFF DURING THE TIMING PROCEDURE (THEN PUT BACK ON AFTERWARDS)?

WAS TIMING PERFORMED AT THE PROPER IDLE SPEED, AND ENDING UP CORRECT AT THE SAME PROPER IDLE SPEED?

THE MEDIC
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Sunday, August 30th, 2015 AT 9:41 AM

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