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Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
Surges when coasting.

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Surges when coasting.

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Old

Aug 9, 2009 | 10:05 AM

#1

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

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Old

Aug 9, 2009 | 10:46 AM

#2

stevilknevil

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From: eaton ohio

mine would do that occasionly.turned out to be a loose fuel line before the lift pump.

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Old

Aug 9, 2009 | 01:39 PM

#3

1994diesel

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From: Central Coast CA

Quote:

Originally Posted by stevilknevil

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

Aug 9, 2009 | 02:12 PM

#4

joe f350

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From: concord ca

have u check the clutch ?

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Old

Aug 9, 2009 | 06:17 PM

#5

PLC7.3

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Joined: Nov 2004

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From: Manitoba

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

Aug 9, 2009 | 09:02 PM

#6

Dave Sponaugle

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From: Nutter Fort, WV

Club FTE Silver Member

Think fuel issues on this, the timing is gear driven and they last a long time.

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Old

Aug 12, 2009 | 08:28 AM

#7

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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