Low erratic oil press at idle after run

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   My 1988 PCM 351 has an erratic low oil pressure (5-15psi)after I have run it at or above approx. 2000rpm for a while and then drop it back down to idle speed. The level is fine and I have tried different viscosities both multi and single grades. After a few minutes it goes up to the norm. It's been like this since I bought it used in the early 90's.

I have not done anything with the gauge or sensor. Any suggestions?

Thanks,

Bill

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wbowden1 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: June-01-2005 Location: United States Status: Offline Points: 1	Post Options Post Reply Quote wbowden1 Report Post Thanks(0) Quote Reply Topic: Low erratic oil press at idle after run Posted: June-01-2005 at 3:33pm
	My 1988 PCM 351 has an erratic low oil pressure (5-15psi)after I have run it at or above approx. 2000rpm for a while and then drop it back down to idle speed. The level is fine and I have tried different viscosities both multi and single grades. After a few minutes it goes up to the norm. It's been like this since I bought it used in the early 90's. I have not done anything with the gauge or sensor. Any suggestions? Thanks, Bill

David F Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: June-11-2004 Location: United States Status: Offline Points: 1770	Post Options Post Reply Quote David F Report Post Thanks(0) Quote Reply Posted: June-01-2005 at 3:51pm
	Change the sensor, then go from there. Avoid using teflon tape when installing the sensor as it can interfer with the grounding of the sensor and give false/erratic readings. Just my .02.

skyhawkflyer Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: February-08-2005 Location: Zimbabwe Status: Offline Points: 275	Post Options Post Reply Quote skyhawkflyer Report Post Thanks(0) Quote Reply Posted: June-01-2005 at 4:08pm
	You need to seal it with something. Otherwise you have to overtighten it to get a good seal. I would use either hylomar, teflon tape on the upper 1/2 of the threads, or pipe thread sealer. Dave is right about the sensor, it's probably getting heat soaked.

jimbo Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: September-07-2004 Location: United States Status: Offline Points: 473	Post Options Post Reply Quote jimbo Report Post Thanks(0) Quote Reply Posted: June-06-2005 at 3:37am
	If you are going to replace the sending unit, make sure you replace it with a marine sending unit, not one from the local auto parts store. The ohms are different. You'll really be getting irradic readings. Check to be sure the connections are good, there could be a grounding problem. But... is there really a problem? Fords usually have low oil pressure. The Ford manual says you should have about 10 psi for every 1000 rpms.

Low erratic oil press at idle after run

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