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04-07-2008, 08:18 PM
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#1 (permalink)
| | Junior Member
Join Date: Apr 2008
Posts: 3
|  I'm pulling out my hair with my new 86!!
I bought an 86 ranger a few weeks back thinking it would make a great little truck for hauling stuff around. And it has been. I like the little guy a lot but it has a little problem. When I get on it hard or am deep in the throttle on hills, it bucks a couple times then runs out smooth again. I thought when I first got it maybe a plugged fuel filter, so I gave it a full tune up. Didn't fix it. I replaced the fuel regulator. Didn't fix it. I checked all the vacuum lines and they look great. I also ran some injector cleaner through it and that didn't change anything. Has anyone else ran into this problem or have any ideas what it could be? Oh yeah, the specs.... It's a 2.9, 5 speed, 2wd. Any help would be greatly appreciated. | 
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04-07-2008, 09:28 PM
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#2 (permalink)
| | Senior Member
Join Date: Feb 2007 Location: Torrance, CA
Posts: 126
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Possible bad TPS sensor. With ignition OFF, disconnect the sensor, put an analog ohm meter to the center pin and one of the edge pins. Operate the throttle. Depending upon what side of the sensor, you'll read high ohms that will drop to almost zero or almost zero ohms that will rise. The direction doesn't matter, the ohm meter needle movement should be smooth with no sudden jumps. If I'm right, there will be an drop towards the high side of the resistance.
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Good Luck...
mj
'01 Ford Ranger 3.0 Super Cab, K&N Air, MaxFlow Exhaust, Oversize Tires 
'93 Ford Taurus 3.0 (Ugh! What a MONEY PIT! Traded it in for the '01 Ranger) 
'87 Ford Ranger 2.3 Super Cab (Owned it for 16 years until some clown t-boned me in it!) 
'92 Ford Aerostar 3.0 (Gave it to Ex in Divorce Settlement) Hehe...
'74 Ford Maverick 250 ci (Great car! 110 mph on Autoban! Traded it in for the '87 Ranger)
'66 Ford Mustang 200 ci (Screwed up and SOLD IT!!)  | |
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04-09-2008, 06:12 PM
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#3 (permalink)
| | Junior Member
Join Date: Apr 2008
Posts: 3
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I checked out my TPS today and that's not it. My ohmmeter was silky smooth as I ran the throttle. Thank you very much for that piece of info. Do you have any other ideas on what it could be? | |
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04-09-2008, 07:25 PM
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#4 (permalink)
| | Senior Member
Join Date: Dec 2007 Location: Chichago
Posts: 160
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whens the last tune-up?
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1995 Bronco XLT 4x4 5.8L 225,000 mi orignial trans re-biult 5.8 V8
1996 2WD Ranger XLT 3.0L 170,000 mi
1995 F-250 XLT HD 4x4 5.8 V8 186,000 mi
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04-09-2008, 08:07 PM
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#5 (permalink)
| | Junior Member
Join Date: Apr 2008
Posts: 3
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I just did that like a week ago... I did everything too... fuel filter, oil + filter, air filter, wires, plugs, and cap + rotor. | |
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