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General Dakota Board
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Jason
Dodge Dakota
JOIN HERE
1/07/2003
12:16:28
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 Subject: oil pump problem
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Message:
recently i bought a dakota and it has already had two oil pumps replaced by the dealer, i myself took the engine down to see if i could find what is wrong with the pump. once i got the pump off i noticed that the gasket that goes between the oil pump and the bottom of the block was missing. i REINSTALLED THE OIL PUMP WITH A GASKET and reinstalled the transmission due to the fact that i had to remove the flywheel and the torque convertor to remove the oil pan. now that i got the engine and tranny back together i tried to crank it and it wouldn't crank. So i ran a diagnostic scan on it and the computer read fault code for a failed crank sensor. my question is there anyways to bypass the crank sensor to prevent it from detecting movement via the flywheel? or should i replace the sensor? I bypassed the sensor on my 88' 383 cubic inch V8 dakota i built and had no problems with it. also is there a recall on the oil pumps on these dakotas? is it an inherant problem with the 3.9 litre and if so is there a fix for it?
Any help would be greatly appreciated.
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AmsoilSponsor
DakotaEnthusiast
1/08/2003
17:08:11
|  RE: oil pump problem
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Message:
From a reliable source:
We are not not famililar with the cps sensors on a Dodge but I suspect first you are discussing a newer vehicle. These sensors do feed information on the cranks position for timing and ignition purposes to the main computer and with feedback sensors from the cam sensors it can determine when to ignite the spark to the plug. Without one or both, the computer can shut down the ignition and not allow the motor to start. All the crank sensors I have seen are the ones mounted on the front of the crank by the lower crank pulley. Most flex plate sensors were tach pick signal sensors for tachomenters but with the newer technology I guess it can be on the flexplate as well.
There are many things that can cause this code, but lets look at the obvious. First, look and ensure you did get the flexplate mounted flush. Second, if you removed the flex plate, was it possible to reinstall it in a different position than what it was, meaning the sensor is now not in the correct location? Of course the obvious comes to mind like posted above, connections to wires.Also, make sure you didn't pinch the wires from the pickup in between any housing you might have reassembled. This would ground out the pickup signal and not let the computer get any feed back pulse telling it when to fire.
The other thing I was interested to know, why is the oil pump being replaced ????? What problem do you have when you take it in that they go to the oil pump? Is the oil pump pressure low?
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Steven Roark , Amsoil Dealer , Proud Sponsor of www.DodgeDakotas.com
AMSOIL Synthetic Motor Oils, Lubricants, Filtration, and Truck Care Products
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Jonas
Dodge Dakota
JOIN HERE
1/10/2003
15:25:37
| RE: oil pump problem
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Message:
I haven't worked on the 3.9 but I have worked on a few older technology DC engines. By "won't crank" I assume you mean it cranks forever without firing? I'd certainly check the CPS first. Beyond the code you were working in that area and its failure can cause your symptoms. What year is this Dakota? The CPS signal is almost certainly mandatory. Without, the ECU will shut down spark and the most you'll get is a quick shutdown after starting. Definitely the first place to look.
About the oil pumps, I agree with AmsoilSponsor. What were the reasons for replacing them? If it's low indicated pressure, is indicated accurate? I'd suspect the sender or faulty connection, but this has probably already been considered. Just trying to throw out ideas.
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