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Driveline Transmissions, Differentials, Axles, Bearings, etc. This forum covers the entire driveline from the Transmission to the wheel bearings!

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  #1  
Old 12-30-2017, 09:45 PM
1991 Dakota 318 1991 Dakota 318 is offline
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Join Date: Nov 2015
Posts: 48
Vehicle: 1991 Dodge Dakota 4x4
Trim Level: LE
Color: red and white
Engine: 1991 - 5.2 L (318 cu in) LA V8, 170 hp (130 kW)
Rep Power: 0
Rep:10
1991 Dakota 318 is on a distinguished road
Default Rough idle

So I was heading home and I was going down the road at about 55 and the tc kept going in and out of lock up. Then when I went to turn it kicked down into third gear really early, and then it seemed to shift really late into overdrive. All the other three gears work fine. When I got home and put it in park, the idle seemed to just go up and down. I hooked the vacuum gauge up to it, and the gauge reads 17ish inches. It dips down to 10 when it idles low, then comes back up with idle speed. I revved it up, and the tach just pegged clear past 6 and stayed there,but the engine for sure didn?t rev near that high. When I disconnect the tps it still idles funny. Is there a vacuum leak, or is it something else. I don?t have a scope, but I do have a multimeter.
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  #2  
Old 12-31-2017, 03:57 AM
1991 Dakota 318 1991 Dakota 318 is offline
Dodge Dakota Forum Junior Member
 
Join Date: Nov 2015
Posts: 48
Vehicle: 1991 Dodge Dakota 4x4
Trim Level: LE
Color: red and white
Engine: 1991 - 5.2 L (318 cu in) LA V8, 170 hp (130 kW)
Rep Power: 0
Rep:10
1991 Dakota 318 is on a distinguished road
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New throttle position sensor did no good. I can?t find any schematics online to see how you test the circuit, there?s three wires that run off of it, I?m getting 4.97 volts from the wire farthest away from the cab, 2.32 on the middle one, and 42 on the other wire? I have no clue what these readings mean. This was all done with the connector disconnected. Someone said to clean out the map sensor. I?m open to any suggestions.
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Old 01-07-2018, 03:39 AM
1991 Dakota 318 1991 Dakota 318 is offline
Dodge Dakota Forum Junior Member
 
Join Date: Nov 2015
Posts: 48
Vehicle: 1991 Dodge Dakota 4x4
Trim Level: LE
Color: red and white
Engine: 1991 - 5.2 L (318 cu in) LA V8, 170 hp (130 kW)
Rep Power: 0
Rep:10
1991 Dakota 318 is on a distinguished road
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Removed aftermarket performance chip and all driveability and tach issues disappeared. The solder joints on the back of the chip were rubbing against the plastic case of the pcm along with signs of corrosion. The back of the chip itself was cracked open, possibly allowing for moisture to enter.
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  #4  
Old 01-07-2018, 04:07 PM
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oldmarine oldmarine is offline
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Join Date: Jul 2016
Location: Newport News, VA
Posts: 238
Vehicle: 2003 Dodge Dakota
Trim Level: base
Color: Black
Engine: 1997-2003 - 3.9 L (238 cu in) Magnum V6, 175 hp (130 kW)
Rep Power: 2
Rep:60
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Thanks for providing followup on what you eventually determined to be the cause of this puzzling issue.

I guess the takeaway for anyone experiencing similar issues, would be to check thoroughly for any aftermarket devices that could contribute to the problem. Even though this was logically listed on the Driveline forum because the initial symptoms showed up in the torque converter and shift patterns, the ultimate cause was electronic.
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Old 01-10-2018, 11:12 AM
johnfunderwhite johnfunderwhite is offline
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Join Date: Dec 2017
Location: south eastern, Pa.
Posts: 10
Vehicle: 2004 Dodge Dakota
Trim Level: SLT
Color: Silver
Engine: 2004-2010 - 4.7
Rep Power: 0
Rep:10
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Hey Buddy. This is John Funderwhite again.(luvmy04). Over the holiday time off I got to look into this heater motor thing. (motor will not run on high) Checked every thing you suggested. Everything checks good. Power from ignition switch, continuity from heater switch to resistor. I mean every thing. Took motor out an applied 12VDC. runs great. when you plug it back in to the system runs on high, but slower than the slow speed. tried a new resistor, nothing. Had the switch apart, not just this time either. Can't find any fault there. wiring diagram is confusing. It seems they are running power to the fan directly ,but regulated by resistor. With switch in high position should power be going through large brown, and tan wire to resistor, and then motor? hope you can help. This is really pissing me off. Maybe we can talk via phone. My # is (717) 371-6514
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Old 01-13-2018, 03:54 PM
volaredon volaredon is offline
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Join Date: Jan 2012
Location: kankakee county IL
Age: 50
Posts: 229
Vehicle: A 92 2wd and a 96 4WD club cab
Trim Level: LE and SLT
Color: One brown and one white
Engine: 1991-1993 - 5.2 L (318 cu in) Magnum V8, 230 hp (170 kW)
Rep Power: 7
Rep:15
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better to put it in its own thread instead of tailing onto a thread that has nothing to do with your issue....
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