4.7 HO oil pressure drop - JeepForum.com
 
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post #1 of 5 Old 11-11-2013, 07:38 AM Thread Starter
Knoxes
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4.7 HO oil pressure drop

My wife's DD, a 2004 4.7L HO apparently had a couple of oil pressure drops in the last couple of days - enough to set off the warning. In both cases, it sounds like the engine was at temp, and she was at idle. Both times, more rpms brought it back up. The first time, I checked the level and it was definitely low (slow leak - on my list of things to fix). I'm running organic Rotella 10/30 in it right now. It has ~100K on it, and I've had it for the last 40K.

I did a quick search to see if there was a recurring issue, but didn't find anything. Hoping this is just a bad sensor... any other ideas?

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post #2 of 5 Old 11-11-2013, 08:03 AM
Cirruslydakota
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Most likely its the sending unit, but to be sure I'd verefy the pressure with a mechanical gauge.

Bear - 1999 Jeep Grand Cherokee Laredo
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post #3 of 5 Old 11-11-2013, 09:03 AM
Bandit84
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It's pretty common for the sensor to fail, replace with a Mopar Sensor. Parts store ones seem to fail again after a year or two.

85' CJ7
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post #4 of 5 Old 11-11-2013, 09:04 AM Thread Starter
Knoxes
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Yeah, apparently my search was limited due to the wrong vernacular. "Sending unit" returns a ton of hits. Thanks for the replies and that little hint.
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post #5 of 5 Old 11-13-2013, 07:02 AM Thread Starter
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PITA to remove. First, it's gotta be almost impossible without the dedicated sensor socket. The sensor measures in between 1" and 1 1/16" or right between 26 and 27MM. None of those will work. So you're left with pliers or the right tool (sensor socket). Picked one up from Advance for around $12. I also picked up a new filter because the sensor seemed so much easier to get at once the filter is removed. Of course, it looks like I broke the connector. I pulled the red pin out to the side, then slid a thin flat head screwdriver under the clip from back to front. It took some pressure to release, but after that, you're home free (assuming that you have that socket).
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