My Ranger doesn't like potholes - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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  #1  
Old 07-06-2009
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My Ranger doesn't like potholes

How's everyone doing? I haven't been in for awhile do to some major work issues the past few months. Things are finally settling down a little now and of course I run into a truck issue. Here's the thing.
I will be driving on a rough patch of road and during or right after I hit the rough the truck almost stalls and then it catches itself. It does this a few times and then it is fine. I watched the tach and it drops from between 2000 and 3000 all the way down to around 500 then picks right back up. When it recovers I could feel the truck jerk\buck and then it will do it a few more times and then it's fine. I'm usually doing around 30mph on these rough roads.
It sort of feels like somethings binds up then lets loose but the motor almost dies so i think I could rule that out. I'm thinking a loose connection since it only occurs over rough road. There's no CEL or no fluid loss and I'll be checking the maf, plugs and wires this upcoming weekend. Anything else you all think I should be checking out?
Thanks all and it's nice to be back on here again. I missed this place!
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Old 07-06-2009
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Whens the last time you did a fuel filter?
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Old 07-06-2009
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About 2 years ago or 15,000 miles. Although I did drop fuel tank when I replaced the fuel filler neck about a year ago. And over the past few weeks I have notice some rough idling when I start it up on occassion, specially after rain, and it has been raing alot as of late around here.

I forgot to add I have a K&N filter on it and it was just inspected and pasenger side lower and upper ball joints replaced. Driver side uppers and lowers were down a year ago.

Last edited by jtfoxman; 07-06-2009 at 10:13 PM.
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Old 07-07-2009
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I wonder if something is over taxing your motor. I had a similar problem but only when I was in neutral or stopped. I had to replace my alternator that had a bad pulley. A week after I replaced mine the problem was gone. Something more serious is probably wrong with yours since it is happening to you while driving but the problem sounds similar.

I also did my fuel filter at the same time I did my alternator
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Old 07-07-2009
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While I was driving home today and after I hit some railroad tracks I let off the gas and the truck stalled. I started it back up while in neutral and it kept on bucking here and there and wanting to stall. After about a minute of the motor trying to die and me preventing it it started to run fine. It was ok for the rest of my drive home.

Fuel filter is a good place to start though.

Thanks
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Old 07-07-2009
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Check the inertia fuel cut off switch. It is designed to trip in an accident and stop fuel flow, but mine would randomly trip while driving down the road and hitting a bump, and sometimes it would just kinda "flicker" and the truck would buck and then go again.
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Old 07-07-2009
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it possibly could b a loose or bad connection to your fuel pump. I would check all the wires and connectors along with the fuel filter and see what you come up with.
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Old 07-07-2009
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my old truck did the thing your talking about when it rained, came out to be the EGR so I disconnected the line and it was better
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Old 07-07-2009
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Quote:
Originally Posted by GrafixGuy View Post
my old truck did the thing your talking about when it rained, came out to be the EGR so I disconnected the line and it was better
My truck does that occasionally, usually just after it's rained. Do you mean you disconnected and then reconnected it, or just left it disconnected?
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Old 07-11-2009
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I may have found the culprit. I checked the throttle body and discovered a whole lot of play in the linkage. Also when you accelerate a little the linkage was actually hitting the tb. I think the rough roads may of had the linkage bouncing all around. I'm picking up a "new" tb today at the salvage yard and see how it runs afterwards.
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Old 07-13-2009
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"New" tb on and it is running great.

Update
Doing it again. This time the truck died and wouldn't start. It started after I turned off my lights and radio. Stumped.

Last edited by jtfoxman; 07-14-2009 at 07:29 AM.
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  #12  
Old 07-19-2009
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Sounds electrical then, how old is your battery and alternator. Your alternator might not be working to its full potential and you can have that checked for free at an advanced auto.
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Old 07-21-2009
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i'd check all electrical connections. i had a gremlin in my golf (not ford related i kno). mechanic couldn't find it to save his life. one day it dies and almost catches fire. turns out there was a bad ground going to the fuel rail. my guy found it real quick after he followed the burned wires.

so lesson learned, check all connections! battery, fuel systems, plugs/wires, everything. you will find it. after that, then go mechanical filter, sensors, things like that.
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  #14  
Old 07-24-2009
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Did you check your spark plugs too, I know they are a pain to get to on the V6 but i had another similar problem when i drove a camery. a spark plug popped out while driving, must have wiggled loose somehow, even though i put it back in it would jerk and buck and had a very uneasy idle. i replaced them all and then it worked just fine.
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Old 07-27-2009
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It turned out it was a wire that rubbed through on my crank sensor. Got it all repaired and it is running fine again.
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