Lurches when fired up.
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Senior User
Joined: Jan 2004
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From: British Columbia
Lurches when fired up.
1988 F-150 351W C-6. 2wd
When I start my truck somtimes it seems to lurch ahead slighty, but doesn't actually slip out of park. And the park pin seems to hold fine when the truck is not running or just parked and idiling. Any ideas on this?
Tranny linkage needs adjustment?
When I start my truck somtimes it seems to lurch ahead slighty, but doesn't actually slip out of park. And the park pin seems to hold fine when the truck is not running or just parked and idiling. Any ideas on this?
Tranny linkage needs adjustment?
Last edited by coplin; Mar 31, 2004 at 02:58 AM.
Elder User
Joined: Sep 2003
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From: Louisiana
Try this, make sure you are in a clear area, nothing to hit with vehicle. Put it in neutral and try starting, see if symptoms are the same. Be ready on the brake if it lurches. Could be linkage. Do you consistently park on an incline and use the ebrake?
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Senior User
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From: British Columbia
Originally Posted by LoosMaster
Try this, make sure you are in a clear area, nothing to hit with vehicle. Put it in neutral and try starting, see if symptoms are the same. Be ready on the brake if it lurches. Could be linkage. Do you consistently park on an incline and use the ebrake?
Elder User
Joined: Sep 2003
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From: Louisiana
I don't think there is any adjustment relative to the linkage. Does the lurch happen during cranking or just as the engine starts? The slop could be coming from a worn roller or what I call the rooster comb.
Elder User
Joined: Sep 2003
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From: Louisiana
Some call it a pawl. In the valve body, the shaft has tab on it that looks like a rooster's comb, 5-6 indents with points on top that the detent roller rides on.
http://auto.howstuffworks.com/automa...nsmission5.htm. The 3rd picture, bottom right you'll see the part.
http://auto.howstuffworks.com/automa...nsmission5.htm. The 3rd picture, bottom right you'll see the part.
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Senior User
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From: British Columbia
Sos I guess I gotta pull the tranny to fix this problem. 
Parking Pawl is worn down would be my guess. Thanks for your help
Parking Pawl is worn down would be my guess. Thanks for your help
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Elder User
Joined: Sep 2003
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From: Louisiana
I wouldn't pull the tranny yet. Drop the pan and drain the oil. You can see this part with the pan off. The detents should be uniform to each other. If 1 looks different or excessively large gapped or the point worn off, that would cause the slop in the park. Possibly in the valve body also due to the travel of the rod not in it's proper position causing a sort of bypass when you start allowing pressure to flow causing the lurch. You shouldn't have to pull the tranny to change this part.
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Senior User
Joined: Jan 2004
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From: British Columbia
20 thousand miles on a new longblock. The tranny could be original but I beleive the guy I bought the truck from put a shift kit in the tranny and flushed it with new juice. Guess he should have checked the pawl too, but then again its something I would have overlooked my self. SO if the detents or the pawl itself are worn down then the whole unit gets replaced? Do i need any specialized tools to do this?
Hotshot
Joined: Oct 2003
Posts: 17,799
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From: Ashland City, TN
my 85 tempo did this.
Just a problem in the torque converter i'm guessing, little bit of friction in the transmission causeing it to move foward cause its not truely in neutral cause of the friction.
Just a problem in the torque converter i'm guessing, little bit of friction in the transmission causeing it to move foward cause its not truely in neutral cause of the friction.
Elder User
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From: Louisiana
OK, coplin, new scenario. Shift kit installed. Has the lurch just started or has been there since you owned the truck. The kit changes the timing of the shift and how hard it goes in. This could be part of you problem. To eliminate some possible problems, lets try this if you want to spend the money. Down here in La, some of the quick lube shops offer tranny flushes. This would clean out any sludge build up. While they're in there, see if they'll let you in the area and look at the pawl. During the flush, the converter gets cleaned also as Tayln mention. That would be the cheapest and easiest thing to do.
