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  #16  
Old 04-05-2011, 05:13 PM
erasmussen erasmussen is offline
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Default Re: Engine Bucks While Driving at Constant Speed or Cruise

I'm having the same problem with my '98 4.0 4x4. I'll be just cruising along and there will be a sudden and violent hiccup. Maybe once every 50 miles, but every once in a while there will be a succession of hiccups. Never more than two.

Can it really be an air intake problem? I do remember having a Buick Park Ave that had a MAF sensor go out that did the same type of thing, but it was much worse and more regular.

This occurs much less frequently than the MAF problem on that beast.
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  #17  
Old 05-04-2012, 02:41 AM
Maritime Storm Maritime Storm is offline
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Default Re: Engine Bucks While Driving at Constant Speed or Cruise

Mine started doing this, did anyone find a cure to it. Mild bucking/misfire under light load that seems to be worse when cool and damp. Plugs are new Autolites, old ones came out looking as white as a sheet of paper and spotless.
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Last edited by Maritime Storm; 05-04-2012 at 02:43 AM.
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  #18  
Old 07-19-2012, 02:18 PM
Amattco2 Amattco2 is offline
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Default Re: Engine Bucks While Driving at Constant Speed or Cruise

Just had this problem with my 96 ranger 2.3ltr. 5 speed stick. Replaced the DPFE sensor. (differential pressure feedback EGR) sensor. About 74.00 at Advanced Auto. Problem solved. Takes 10 min.
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  #19  
Old 07-21-2012, 03:50 AM
Maritime Storm Maritime Storm is offline
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Default Re: Engine Bucks While Driving at Constant Speed or Cruise

Did anyone ever figure this one out?
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  #20  
Old 07-21-2012, 08:24 AM
jcube_04 jcube_04 is offline
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I agree with crowdpleazer, it sound like a fuel issue, youre running lean. A couple things you can do that shouldnt xcost anything.....check your air intake assembly from the mass airflow sensor, along the intake tube to the manifold,to make sure there are no tears or holes. Second check fuel pressure, there should be a test port on this engine
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2003 Ranger 2wd 5 spd. 2.3L, 3 in blocks, 5 in. Camburg spindles, 1 in uniball upper control arms, upgraded coils with Rancho shocks. Buggman LED cluster. Painted 2wd fog bezel, shifter cupholders, door handle surrounds, window lever, and lock lever. 33 in wild countrys.
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  #21  
Old 07-21-2012, 11:34 AM
goosehunta goosehunta is offline
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Does your exhaust smell normal? My 99 ohv would run rough when first started in mornings. After a while I started smelling coolant out the exhaust. I would get a misfire cel for cyl 4. Well cracked head is my problem.
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  #22  
Old 07-21-2012, 11:38 AM
02RangerFX4 02RangerFX4 is offline
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Default Re: Engine Bucks While Driving at Constant Speed or Cruise

Quote:
Originally Posted by 04FX4LevelII View Post
Automatic transmission, and this happens only when cold and raining/snowing.
OK so my truck used to do this a long time ago only in cold weather/snowy weather. Except it wouldn't really buck it would just kind of do a extremely quick skip every few miles. It turned out to be that the gas i was getting was crap during cold weather for some reason, i switched to HESS and it hasn't happened since then.
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  #23  
Old 07-23-2012, 02:48 AM
Maritime Storm Maritime Storm is offline
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Default Re: Engine Bucks While Driving at Constant Speed or Cruise

I'm starting to wonder the same thing, if this is a gas related issue as well. We already know the 4.0L runs very lean to begin with.
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  #24  
Old 07-23-2012, 11:28 PM
02RangerFX4 02RangerFX4 is offline
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Default Re: Engine Bucks While Driving at Constant Speed or Cruise

Quote:
Originally Posted by Maritime Storm View Post
I'm starting to wonder the same thing, if this is a gas related issue as well. We already know the 4.0L runs very lean to begin with.
It most likely is. I mean those are the same exact symptoms i was having. I was using the gas from Exxon when this happened to me.
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  #25  
Old 05-02-2013, 03:04 AM
Maritime Storm Maritime Storm is offline
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Default Re: Engine Bucks While Driving at Constant Speed or Cruise

Any new ideas?
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  #26  
Old 05-02-2013, 10:47 AM
cowboybilly9mile cowboybilly9mile is offline
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Default Re: Engine Bucks While Driving at Constant Speed or Cruise

Quote:
Originally Posted by 04FX4LevelII View Post
I have noticed that when I am driving at a constant speed, foot barely on the pedal, the truck will sometimes "buck." It does not do this when I am accelerating or not pressing the pedal at all. It will do it sometimes while cruise control is engaged and is holding at a constant speed. My old Mazda MX6 did this same exact thing, however, when it did it the engine light would come on for problems with the EGR. The truck is NOT throwing the engine light.

Does anyone have any ideas? I am thinking it is either EGR related, or I need to clean the MAF and TB.

The truck is a 2004 FX4 Level II with 30,000 miles. No major maintenance has been completed that I know of.
Quote:
Originally Posted by 04FX4LevelII View Post
Automatic transmission, and this happens only when cold and raining/snowing.
Your posts have some mega clues that lead to a common denominator, and I can tell you exactly what is causing this. I can tell you that you won't fix it by playing the sensor replacement guessing game or the spray this, clean that boogie.

The problem is fixed by taking it to a Ford dealer and having them flash the PCM as prescribed by a TSB that specifically addresses this driveability issue. Been there, done that, and when done a sticker is placed in the rad core support with the TSB number and the date. Unless you can somehow do this yourself, you will be seeing the dealer. If you're reading this now, I guess it's a little late for warranty, but maybe a sympathetic dealer will cut you a break.
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  #27  
Old 05-03-2013, 02:52 AM
Maritime Storm Maritime Storm is offline
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Default Re: Engine Bucks While Driving at Constant Speed or Cruise

If there is a TSB on this, please post it.
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  #28  
Old 05-03-2013, 09:43 AM
cowboybilly9mile cowboybilly9mile is offline
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Default Re: Engine Bucks While Driving at Constant Speed or Cruise

I can't find the contents of the TSB, but the TSB number taken from the aforementioned sticker is 05-05-08. The TSB title will be something like, "Engine surge at a steady throttle during the first 5 minutes after a cold start". I found the TSB myself, took my chariot to the dealer, told them it's doing this and that I wanted them to flash the PCM to cure this issue per the TSB. Oh yeah, it's under warranty too.
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