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Unread 03-28-2010, 04:54 PM   #1
Spagent
Registered User
2012 JK Wrangler 
 
Join Date: Jan 2010
Location: New York
Posts: 41
Help! Low and now High Oil Pressure

Hey everyone!

Here's the story... Getting onto the highway yesterday and as I was accelerating (nothing crazy) to merge into traffic, my Check Guages light started to blink and beep and my Oil Pressure Guage dipped to zero. I immediately pulled over and shut off the engine. Checked for leaks and oil level. Everything was fine and the engine felt like it was running normal/well.

So of course I jumped on the forum when I got home and read up on the issue. Most recommended the Oil Pressure Sending Unit which I replaced this morning. Here's the strange part...She has always sat at a constant 40psi until yesterday and now even with the new sending unit she is running around 50psi and fluctuates +/- 15psi.

Most times a bad oil pump shows LOW oil pressure so the only other thing I can think of is an Oil Filter that went bad??
Any thoughts?? THANKS!!!!!!!!!!!!!!!!!!

('01 TJ, 4.0L, 5 Speed, 115K...Has always run like a top and still looks new)

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Unread 03-28-2010, 05:20 PM   #2
PlatinumNiner
Web Wheeler
1998 ZJ 
 
Join Date: Oct 2009
Location: Long Island NY
Posts: 2,724
OK oil pressure should bounce around. Lower at idle higher at higher RPM Stock sending units are built not to do that. It makes people nervous lol. Put an OEM sending unit in and it wont move around. Aftermarket sending units are more true. If your really worried try installing a mechanical gauge for a little while just for peace of mind.
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Unread 03-31-2010, 08:44 PM   #3
Spagent
Registered User
2012 JK Wrangler 
 
Join Date: Jan 2010
Location: New York
Posts: 41
So you think its just because the sending unit is aftermarket?
Hmm...
Although I got it at Advanced Auto Parts, it certainly looked identical to stock. Hope youre right!!!


Can anyone think of any other reasons this might happen? Although my mileage is high, I'd like to keep her around a while. Still in great shape
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Unread 03-31-2010, 10:45 PM   #4
PlatinumNiner
Web Wheeler
1998 ZJ 
 
Join Date: Oct 2009
Location: Long Island NY
Posts: 2,724
If you look at the hole in the end of it that registers the oil pressure it's half the size of the OEM mopar piece. Doent function exactly the same because of that.
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