Zf6 lurching? - Ford Powerstroke Diesel Forum
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post #1 of 6 Old 01-20-2012, 08:38 AM Thread Starter
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Zf6 lurching?

My dads zf6 in either L or 1 seems to want to lurch or jump back and forth like someone just learning to drive a stick. No matter how you take off unless you are at least 3/4 throttle it does this. Have been told its a flywheel issue. Clutch hasn't been slipping or anything. Any ideas?

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post #2 of 6 Old 02-05-2012, 02:19 AM
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in L the truck just lurches naturally, mine does it, it jumps forward and then levels off. and in 1st because of the low gearing it is likely to do it to. it might compounded if your clutch is going bad, usually 3/4 throttle is a little high to be starting off, lurching from that RPM would always happen, and you would almost have to slip the clutch. mine will lurch depending on the throttle if i don't quite have enough it will hop forward, nothing bad just the clutch is struggling to pull the weight of the truck forward
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post #3 of 6 Old 02-05-2012, 03:17 AM
spool up that turbo!!


 
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Mine doesn't lurch I can usually take off no throttle nice and smooth


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post #4 of 6 Old 02-09-2012, 03:21 PM
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Quote:
Originally Posted by hollister25073 View Post
Mine doesn't lurch I can usually take off no throttle nice and smooth


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This.

A flywheel that needs resurfacing could chatter/shudder but that doesnt sound like what you are describing.

If you engage the clutch slowly and smoothly enough it should be as silky as a standard trans Honda Civic.
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post #5 of 6 Old 02-09-2012, 04:03 PM Thread Starter
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Maybe I described it wrong. I'm not taking off at 3/4 throttle. No matter how you take off it jumps and lurches until you give it at least 3/4 throttle to smooth it out. The only way it doesn't happen is if you constantly "ride" the clutch which is obviously not good for it

99.5 F250 7.3 4x4 116,000 and counting
285/75/16, Zoodad, Stancor, CCV, 6637,TS w/PHP tunes
Autometer pillar gauges, Foil delete, FRx
4" turbo back straight pipe, Ported turbo housing
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post #6 of 6 Old 02-11-2012, 11:16 AM
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What you are describing sounds to me like your ICP sensor may have gone bad. I had a similar problem with mine when trying to idle down 4x4 trails. The truck would lurch forward, and then drop off, and then lurch, drop, lurch, drop..... Got pretty old trying to ride the clutch to make it smooth.

Just try unplugging the ICP and see if the problem goes away. If it does, you may have found the problem.

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