Question about Dodge D150
Hi Trevor, sorry your having such a bad day. I would suspect you may have two different problems, it could be just one but the reason I think two is being a 1990 truck I'd check to see for sure if it did not still have the old mechanical cable from the transmission through the firewall and plugged into the back of the speedometer. If so you can unscrew it from the back of the transmission and use a drill to turn the cable. Be easy with it so you don't bend it up. Go slow at first and have someone watch the speedometer to see what happens. If it acts all crazy or doesn't work, hangs up, something like that you most likely have a bad cable. not too bad to replace you are already half way there. Now if it does work smoothly and speeds up and slows down with the drill the there is a little ( usually plastic ) gear that sits right inside the hole. You'll have to get you a little pick or needle nose to get it out but again be gentle because it meshes with another little gear in there. Go get the right one for your truck , you'll need the transmission type number, the tire size that came on the truck not the monster mudders you put on it to impress the girls because then we'll have to go and get all scientific and calculate what gear to get. LOL Hopefully that may help you there . You could have a loose ground but honestly it sounds like a short to ground. A hot wire may be touching a ground wire somewhere under the dash. You know last week when you were pulling on the wires installing the news radio for some tunes and a new CB you may have gotten something crossed up a little. If you already have the dash off anyway checking on the speed cable just turn the key on and start looking to see if you see any discoloration like where something was getting hot or if your brave or desperate use your hand like I do and feel around to see if any of the wires seem like they are getting hot. You'll be able to tell they'll be a lot warmer than the others. heck I've seen where a mouse had crawled up in a dash board and chewed the insulation off some wires and caused problems so just jump on in that's how ya learn. let me know what you find. You may just have a electrical speedometer on that truck and it all be because of that durn mouse. Good Luck. and keep us posted.
Posted on Mar 23, 2014
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Posted on Jan 02, 2017
I had a similar problem. In my 1966 Mustang gas tank, the fuel pick-up was on a "float." My float developed a hole, filled with gasoline, and sank to the bottom of the tank, therefore, the gauge always read empty, but the car ran well. All the other gauges of course worked correctly. The repair was a relatively simple soldering job (after removing the float from the tank), but if that is indeed the problem, ensure all the gasoline is drained from the float before beginning the soldering job.
Posted on Dec 05, 2008
sounds like your missing a ground somewhere.
Posted on Apr 21, 2009
SOURCE: oil pressure problem
You oil pressure sending unit has gone bad, it's common to go bad and some even leak oil.
The oil pressure sensor is on the back of the block on the passenger side, you can get to it from the top and not from the bottom. There are (2) switches back there that screw in to the block and you can only see it from the top of the engine. The Oil Pressure Sending Unit is the one wire harness with a green and white strip on it. The other switch has more wires to it.
When you pick up the new sensor, make sure you get the right one. make sure you get the Oil Pressure Sending Unit which sends variable oil pressure and has only one quick connect for the wire connector. The oil pressure switch is the one that only activates the oil light on older engine.
Once you get the right part at Auto Zone for around $9.00, disconnect the wire clip with the green with white strip on it. and use a deep spark plug socket with a extension and u joint to get the sensor out. The sensor comes with teflon tape already and no oil should leak out from the block. It as simple as replacing a bolt and reconnecting the wire connector.
Good luck and hope this helps, take no more then 10 min to do but about 5 hours for the engine to cool off LOL
Posted on May 29, 2009
SOURCE: oil pressure fluctuating
The sensor could be failing to read the lower pressure when the engine RPM slows down. Or the pump could be failing. I would replace the sensor and see if that doesn't correct the problem
Posted on Jul 11, 2009
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