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Surges when coasting.

 
  #1  
Old 08-09-2009, 10:05 AM
hogdogs
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Surges when coasting.

The other issue with my pop's 87 6.9 4 speed is that when you lift off the pedal a bit, it is likely going to get to surging/lurching. Could this be a severely loose timing set up? seems like it almost feels equal to a super slack flappin' timing chain with broke tensioner would feel...
Brent
 
  #2  
Old 08-09-2009, 10:46 AM
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mine would do that occasionly.turned out to be a loose fuel line before the lift pump.
 
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Old 08-09-2009, 01:39 PM
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Originally Posted by stevilknevil View Post
mine would do that occasionly.turned out to be a loose fuel line before the lift pump.
Yea, it sounds like it could possibly be air intrusion
 
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Old 08-09-2009, 02:12 PM
joe f350
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have u check the clutch ?
 
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Old 08-09-2009, 06:17 PM
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Is the fuel tank selected at or near 1/4 full........ could be a broken fuel pickup in the tank.
 
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Old 08-09-2009, 09:02 PM
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Think fuel issues on this, the timing is gear driven and they last a long time.
 
  #7  
Old 08-12-2009, 08:28 AM
hogdogs
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The problem was fuel delivery related.... Yesterday I installed a rotary type lift pump, bypassing the mechanical. 10 new feet of 5/16th line and his surging is gone. Overall from idle to pulling load, the truck is 100% smoother now.
Thanks...
Brent
 
 


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