oil pressure issue

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04-28-2009, 10:12 AM

#11

ryan_89_mustang

4th Gear Member

Join Date: Oct 2006

Location: Canada

Posts: 1,217

If it was a bearing problem it most likely wouldn't be bouncing and would be constant. You are going to get lower oil pressure at warm idle regardless but bouncing down to 0 makes me think it is your sending unit or gauge. I think a new sending unit is somewhere around 10 bucks so it is worth a try.

04-28-2009, 10:18 AM

#12

1990lxhatch

2nd Gear Member

Join Date: Mar 2008

Location:

Posts: 153

Its normal for oil pressure to drop as the engine warms... oil becomes much thinner at operating temp....

But before you freak out and decide to troubleshoot a low oil pressure issue, your first step would be to confirm that you are actually losing oil pressure and not just your signal. The stock gauge is inaccurate, and the stock sending units are.... less than perfect. Get an actual gauge on it.

There is no spec either. 10lbs of pressure per 1000 rpms is all you need.

04-28-2009, 11:44 AM

#13

Timspony

SVT Section Moderator

Join Date: Jul 2008

Location: Burnt Hills, NY

Posts: 15,601

...mine did the same thing, eplaced the sending unit, did the same thing...PUT on an Auto Meter mech. gauge and the oil pressure was fine!! 60psi cold, 30psi hot (idol pressure)....Can't trust those stock gauges!

04-28-2009, 12:58 PM

#14

gtmustang1090

1st Gear Member

Thread Starter

Join Date: Jul 2008

Posts: 131

thanks for the imput guys i was alittle worried... i am gonna hook up a diff gauge and change the sending unit i already had to change the temp sender as well.. and oh yeah and one other thing the check oil light pops on every once in a while out of nowhere then goes off..

04-28-2009, 01:15 PM

#15

67mustang302

6th Gear Member

Join Date: Apr 2007

Location: California

Posts: 10,468

Definitely get a good sending unit and gauge first. Chances are if you really had 0 oil pressure at idle, you'd hear the car rattling away. Stock gauges are so inaccurate it's a joke really.

04-28-2009, 02:07 PM

#16

XPBaller

4th Gear Member

Join Date: Dec 2005

Posts: 1,123

Quote:

Originally Posted by 67mustang302

Definitely get a good sending unit and gauge first. Chances are if you really had 0 oil pressure at idle, you'd hear the car rattling away. Stock gauges are so inaccurate it's a joke really.

WRONG. A lot of the time when that **** starts happening you wont feel it, but when it starts getting real ****ed up itll rear its ugly head with knocks/vibrations.

Like suggested before, pull the sending unit out and get an actual gauge on it, rule of thumb is 10psi per 1000rpm

and while the oil pressure dropping as the car heating up is true, but only to an extent. Youre not gonna have normal pressure and then it just fall on its face when it warms up. Get real dude..... Maybe if you have a real ****ed up gauge.