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12-02-2021, 04:28 PM | #1 |
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PRESSURE GAUGE ABRUPTLY BOTTOMS OUT BELOW 1000 rpm
F150 W/ 3.7 liter V6. Once the engine has been running for 10 - 15 minutes (whether idling or under load), the pressure gauge bottoms out and the engine oil warning symbol and alarm go off as soon as the RPM's drop below 1000. As soon as the RPM's are brought back to over 1000 RPM, the gauge bounces right back to the normal range. The top and bottom ends sound fine. idles fine, starts fine, acceleration spot on, the oil level is spot on, the engine temperature is consistently in the normal range and no problem whatsoever cruising at the speed limit on the interstate. What might be causing this?
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12-02-2021, 06:10 PM | #2 |
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Re: PRESSURE GAUGE ABRUPTLY BOTTOMS OUT BELOW 1000 rpm
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12-03-2021, 06:19 AM | #3 |
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Re: PRESSURE GAUGE ABRUPTLY BOTTOMS OUT BELOW 1000 rpm
2014
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12-03-2021, 11:11 AM | #4 |
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Re: PRESSURE GAUGE ABRUPTLY BOTTOMS OUT BELOW 1000 rpm
It seems FORD is having trouble with the OIL PRESSURE SENDING UNIT.
Go Here - https://www.consumerreports.org/car-...-tsb-for-free/ And enter your VIN to see if any RECALL and/or TSB INFO. Does the MIL (Check Engine Light) illuminate at any point? Get back. |
12-03-2021, 04:54 PM | #5 |
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Re: PRESSURE GAUGE ABRUPTLY BOTTOMS OUT BELOW 1000 rpm
No recalls, no TSB's and Check Engine Light does not illuminate.
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12-03-2021, 05:59 PM | #6 |
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Re: PRESSURE GAUGE ABRUPTLY BOTTOMS OUT BELOW 1000 rpm
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12-03-2021, 07:06 PM | #7 |
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Re: PRESSURE GAUGE ABRUPTLY BOTTOMS OUT BELOW 1000 rpm
Yeah, because it is tied to the PCM (POWER-TRAIN CONTROL MODULE). It will stop the engine if it doesn't see correct oil pressure.
If you GOOGLE the year truck/engine and the problem, you will find a bunch of info.
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12-05-2021, 10:26 AM | #8 |
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Re: PRESSURE GAUGE ABRUPTLY BOTTOMS OUT BELOW 1000 rpm
Will be replacing the sending unit. Found it just below and back of the alternator. As luck would have it, can easily reach it from the top. Googled as suggested. One mentioned this all started just after he changed the oil. Bingo! Same here ! ! ! Coincidence? Who knows. Wonder if some crud got stirred up and found its way to the sending unit when I changed the oil. Not likely anything I did wrong when I changed the oil & filter as I am OCD about that stuff and have been changing same since the 60's (first one was on an early 50's Willys flat head). Thanks go out to KULTULZ and Cadillac 512 for taking the time and interest to point me in the right direction. PS, totally agree with your stated philosophies - good old common sense and being a straight shooter are two of man's best friends in life!
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12-05-2021, 10:49 AM | #9 |
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Re: PRESSURE GAUGE ABRUPTLY BOTTOMS OUT BELOW 1000 rpm
Make sure it is a MOTORCRAFT switch as aftermarket has been giving trouble.
Also, read in your research about oil pressure failure in this engine series.
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12-05-2021, 12:10 PM | #10 |
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Re: PRESSURE GAUGE ABRUPTLY BOTTOMS OUT BELOW 1000 rpm
- FORGOT - Make sure the connector has no oil due to the sensor leaking. Also check the harness to see if oil wicked up it. Use electric contact cleaner to remove any oil.
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***** - WHY IS IT ... - ... that everything you buy in the grocery store is either wrapped in or contained in plastic but the government doesn't want you to carry it out in a plastic bag? WONDERING IN W(BY GOD)V ...
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12-06-2021, 12:20 PM | #11 |
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Re: PRESSURE GAUGE ABRUPTLY BOTTOMS OUT BELOW 1000 rpm
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12-06-2021, 12:20 PM | #12 |
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Re: PRESSURE GAUGE ABRUPTLY BOTTOMS OUT BELOW 1000 rpm
Will do. Thanks!
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12-10-2021, 02:23 PM | #13 |
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Re: PRESSURE GAUGE ABRUPTLY BOTTOMS OUT BELOW 1000 rpm
Follow up:
Disconnected the negative battery cable. Disconnected the electrical terminal connector to the old sensor (sqeeze & pull). Disconnected (7/16" socket) the battery cable from the alternator and swung out of the way to gain room to get the old sensor out. Spun out (13/16" socket to start & then 13/16" open end) the old sensor. Couple of applications of electrical contact cleaner to the electrical terminal connector. (found oily when removed due the old sensor leaking oil). (this also explained some oil loss that I had started experiencing but could not figure out where). Installed the new sensor being careful not to over torque and orientating so that the the side of the sensor where the depressed plastic snaps in matched the "lay" of the terminal connection (to avoid unnecessary bending of the light gauge wire). Did not need to ad Teflon tape as the threads already had Teflon applied). Applied a dab of dielectric compound to the electrical connection and snapped into place. Reconnected the alternator battery cable (gave that a light sqirt of cleaner for good measure also before reconnecting). As long as the neg cable was already off the battery, removed the positive cable also, cleaned the battery posts, cable ends, reconnected & sprayed both with battery corrosion inhibitor. Started the engine, checked for leaks and checked the oil pressure gauge both at idle and after running under load for awile. So far so good! Thanks go out again to KULTULZ and CADILLAC 152 for solving the mystery and pointing me in the right direction. |
12-10-2021, 02:44 PM | #14 | |
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Re: PRESSURE GAUGE ABRUPTLY BOTTOMS OUT BELOW 1000 rpm
Quote:
Keep an eye on the MIL.
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***** - WHY IS IT ... - ... that everything you buy in the grocery store is either wrapped in or contained in plastic but the government doesn't want you to carry it out in a plastic bag? WONDERING IN W(BY GOD)V ...
DIAGNOSED CDO - (OCD In Correct Alphabetical Order) |
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12-11-2021, 04:17 PM | #15 |
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Re: PRESSURE GAUGE ABRUPTLY BOTTOMS OUT BELOW 1000 rpm
That's great. Good job!
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12-14-2021, 09:38 AM | #16 |
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Re: PRESSURE GAUGE ABRUPTLY BOTTOMS OUT BELOW 1000 rpm
KULTULZ and CADILLAC 512 - Many thanks for the good words and yes, I did notice some "out of character" shifting going on initially but that has pretty well worked itself out. After
dealing with that dog gone dinging buzzer going off constantly, what a pleasure to drive now without that irritant! BTW, forget to mention in the "follow up" that I did use a Motorcraft sensor as suggested. |
12-14-2021, 11:00 AM | #17 | |
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Re: PRESSURE GAUGE ABRUPTLY BOTTOMS OUT BELOW 1000 rpm
Quote:
Here's One - https://k-mansparts.com/ Just One Online Dealer - https://www.tascaparts.com/v-ford
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***** - WHY IS IT ... - ... that everything you buy in the grocery store is either wrapped in or contained in plastic but the government doesn't want you to carry it out in a plastic bag? WONDERING IN W(BY GOD)V ...
DIAGNOSED CDO - (OCD In Correct Alphabetical Order) |
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