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Old 10-09-2007, 11:29   #1 (permalink)
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Exclamation RPMs up = Oil pressure down. Please Help!

Hello all. I've got this oil pressure problem with my 94 ranger. It's a 3.0 crate motor from Jasper with about 40k miles. Its got the original oil pump with 113k. When I 1st bought the truck about a month ago, the oil pressure would drop slightly under acceleration. Now at 3000 RPMs it drops to low: all the way past the "L" on the stock gauge. The motor stalls at 3500 RPMs, but I can't hear any knock. The oil level is normal. I've never had to add oil and no smoke is visable.

Oil pump problems are usually the opposite, right? RPMs up = oil pressure up

Maybe oil sending unit?
If so, is there a thread for replacing the sending unit on 3.0 V6?

Thank you for your time.
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Old 10-14-2007, 16:22   #2 (permalink)
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Thumbs up Re: RPMs up = Oil pressure down. Please Help!

Hello again. I fixed the problem. It was the oil sending unit. It's located on the passenger side back of block. It's a real b##ch to replace, so make sure you have the whole day to do the work. Also, make sure the manifold is cool, as you will be grinding your left forearm on it. Took me 5 hours; 4 to get it out and an hour to put it back and install new cap, rotor, and wires. I think its a 27mm on the sending unit. I used a deep socket with an adjustable stubby ratchet.

Is there a reason why no one answered? I might have another question in the future...

Thanks!
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Old 10-14-2007, 19:08   #3 (permalink)
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Re: RPMs up = Oil pressure down. Please Help!

Traffic is slow sometimes and not everyone here knows the answers. I respond to the ones I feel that I may be able to help. It is better if nobody responds, than to be given a completely wrong answer. Hopefully next time you will get a good response in a timely manner. Thanks for giving your solution, it may help someone in the future, especially if they use the search feature.
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