Started driving the truck and noticed the tachometer was wildly fluctuating. Then noticed the oil pressure gauge needle was at the halfway mark (straight up) when normally sits on the first leg of the arch). Stopped the truck, the needle stayed in place. Tried to start the truck and heard "tic tic tic" and it wouldn't start. Waited about 5 minutes and it started. Drove it home, by the time got there the oil pressure gauge was all the way to the right/high. Let the truck sit for a couple of days, tried it today. Tachometer is okay, but the oil gauge goes to halfway as soon as the truck is put in gear. When I turn off the vehicle the needle stays straight up and doesn't go back down.
Have a mechanic test the oil pressure with a mechanical gauge
it is more than likely that the electric sender unit has failed and is sticking internally
the tic noise could be a relay working from an intermittent power supply or bad ground
SOURCE: I have a 2001 Dodge Dakota 3.9 v6 it has been
If it has high miles over 100,000 miles it just might be oil pump. But first I would chenge oil sending unit , and yes it hea one,Back of engine, just to the passenger side of the
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SOURCE: The problem is for a Dodge Ram 1500 3.9L V6 . My
The first thing to do is put a mechanical oil pressure gauge onto the engine and verify that your oil pressure is actually dropping to 0 psi. If it is, pull the oil pan and check the oil pump pick-up screen for sludge (plugged). This is common in engines that have not been well maintained, If it is plugged, you'll need a new oil pump and pick-up screen (you may want to try this, then go after the overheating problem). Also check for ant particles of metal in the oil pan, if you see any chunks, you've probably spun a bearing and need a new engine. Also wiggle all the rods and check for excessive play (again, a spun bearing). Also, if the truck is a pre 2001 model, it's possible that the intake manifold pan gasket has blown out and the engine is sucking oil through the intake, allowing the engine to run low on oil. As far as the over-heating, it may be a separate problem, unless oil starvation has caused a hot spot and cracked the block or head(s). But it may just be a coincidence that both problems started at the same time. So basically, if you've lost oil pressure, you'll have to tear the engine down to the bare block to find all damage, but it will probably be cheaper to put a used or reman long block in
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