hesitation & bucking - Ranger-Forums - The Ultimate Ford Ranger Resource

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Old 10-13-2008
Rob99's Avatar
Thread Starter
Join Date: Jan 2005
Location: Nutley, NJ
Posts: 174
hesitation & bucking

This problem just started only happens between 35-40mph it's noticable enough to to feel although no backfiring or popping ,all other speeds are fine and revving in nuetral dosn't replicate it.
fuel filter was changed a few thousand miles ago
as were plugs,wires, thermo new air filter, no codes i checked with my Innova scanner
Startup idle goes high when cold and sometimes takes long to come down.
4.0SOHC approx 58,000miles hope i gave enough info to try and diagnose
TIA for any ideas/help. Rob
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Old 10-14-2008
Crunchy's Avatar
Join Date: Oct 2007
Location: Hull, Quebec
Posts: 486
Does it feel like someone hit your from behind? A tranny flush fixed it for me, my fluid was on its way out.
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Old 10-14-2008
Rob99's Avatar
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Join Date: Jan 2005
Location: Nutley, NJ
Posts: 174
yea it kinda feels like that, i recently(at 50,000) had the tranny flushed & new filterso im not thinking it's the tranny.
i did mess around with it today and with the hood up and moving the accel cable at the throtle body i can hear a slight miss i sprayed TB cleaner and put in some techron gas additive, and see what happens.
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Old 10-15-2008
wydopnthrtl's Avatar
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Join Date: Dec 2005
Location: SE, Mi
Posts: 2,342
I'd clean the MAF sensor and disconnect the battery for 10 minutes.
It's cheap and would at least rule out a simple thing.

If that didn't change things.. I'd go looking for a vacuum leak.

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