Oil pressure is scaring me!! Help

4.6l-eatr · 03-23-2002, 12:35 AM

Ok i have this weird problem! Whenever i push the clucht in my oil pressure drops right off the gauge! I mean below the L on the stock gauge! If i then tap the throttle just a bit it moves back to the halfway point! But it never runs higher thean halfway it is either halfway or low! What is going on!!!!! Oh yeah 91 gt 5 speed!

joe4speed · 03-23-2002, 02:17 AM

How many miles do you have?

MDM · 03-23-2002, 09:59 AM

I would like to know your mileage as well. Your problem may be a bad sender on the factory gauge or may be a low oil pressure issue that warants concern. As we all know the inaccuracy of the factory gauges, I would install one from Autometer and place the sender in the space presently occupied by the facotry sender. You could also try replacing the factory sender, but in the end you would still be working with a questionable gauge. The autometer will give you a true reading rather than just H and L and you will be able to get a good read on your motor from there. Oil pressure gauges only cost around $40 from Summit. If you don;t want to disable the factory gauge, you can build a simple T fitting with parts from Home Depot and run both senders that way. Let us know how it goes.

4.6l-eatr · 03-23-2002, 11:58 AM

115,000 miles

Unit 5302 · 03-23-2002, 12:58 PM

You can either check real oil pressure with a quality aftermarket gauge, or you can replace you existing sending unit and see what happens.

The aftermarket gauge is recommended.

5ohCOUPE · 03-23-2002, 07:11 PM

I agree with the aftermarket guage. I would suspect that the sending unit is taking a dump. If you put the aftermarket guage on and it still does it then the next thing would be the oil pump going bad. If its not the oil puimp then well you know, bearings. I wouldnt think it bearings because 115,000 miles is just breaking in on a 5.0.

Ive got 175,000 on mine and still kicking.

MidNiteBlu 5.0 · 03-23-2002, 11:15 PM

Mine does the same thing but it doesnt go below the low. It goes probably about the last line or two before the low. When i tap the gas it goes back to the middle. My car has 98k miles

exgmguy · 03-24-2002, 04:03 PM

You are still in decent shape if you have 20 psi when it's warm at idle, and 40 on the gas.

03-23-2002, 12:35 AM	#1
4.6l-eatr Registered Member Join Date: Dec 2001 Location: Janesville Wi Posts: 33	Oil pressure is scaring me!! Help Ok i have this weird problem! Whenever i push the clucht in my oil pressure drops right off the gauge! I mean below the L on the stock gauge! If i then tap the throttle just a bit it moves back to the halfway point! But it never runs higher thean halfway it is either halfway or low! What is going on!!!!! Oh yeah 91 gt 5 speed!

03-23-2002, 02:17 AM	#2
joe4speed He said Member...heh, heh Join Date: Sep 1999 Location: Jupiter, Florida U.S.A. Posts: 3,718	How many miles do you have? __________________ *Joe!* 1988 GT, 13.58@101mph Check out my listing! Click here! Or my website:www.joe4speed.com

03-23-2002, 09:59 AM	#3
MDM Registered Member Join Date: Feb 2000 Location: Flemington, NJ USA Posts: 166	oil pressure I would like to know your mileage as well. Your problem may be a bad sender on the factory gauge or may be a low oil pressure issue that warants concern. As we all know the inaccuracy of the factory gauges, I would install one from Autometer and place the sender in the space presently occupied by the facotry sender. You could also try replacing the factory sender, but in the end you would still be working with a questionable gauge. The autometer will give you a true reading rather than just H and L and you will be able to get a good read on your motor from there. Oil pressure gauges only cost around $40 from Summit. If you don;t want to disable the factory gauge, you can build a simple T fitting with parts from Home Depot and run both senders that way. Let us know how it goes.

03-23-2002, 07:11 PM	#6
5ohCOUPE Registered Member Join Date: Sep 2001 Location: ORANGE PARK FL. USA Posts: 208	I agree with the aftermarket guage. I would suspect that the sending unit is taking a dump. If you put the aftermarket guage on and it still does it then the next thing would be the oil pump going bad. If its not the oil puimp then well you know, bearings. I wouldnt think it bearings because 115,000 miles is just breaking in on a 5.0. Ive got 175,000 on mine and still kicking. __________________ 91 LX COUPE, 3.73 gears, 2 1/2 inch H-Pipe, 1 5/8 MAC long tube headers, 73 MM C&L MAF, 70 MM MAC TB, LUNATI cam,1.7 TFS Rockers, TFS Track Heat heads, TFS Track Heat intake, T5 with PRO 5.0 shifter, Griffin aluminum radiator, Fluid Damper, SSM traction bars, 190 GPH in tank fuel pump. And more to come.

03-23-2002, 11:15 PM	#7
MidNiteBlu 5.0 I got something to say Join Date: Sep 2001 Location: San Diego, CA Posts: 1,557	Mine does the same thing but it doesnt go below the low. It goes probably about the last line or two before the low. When i tap the gas it goes back to the middle. My car has 98k miles __________________ 91 LX Hatch 5.0 - made for the twisties 89 LX Hatchback 5.0 5spd. stolen/stripped 4/7/05 http://www.mustangworks.com/cgi-bin/...splay.cgi?3494 1987 Toyota Pickup Ricer Haters Club Member #33 Want a custom gauge cluster for your Vintage Mustang? www.jmeenterprises.com

03-23-2002, 11:58 AM	#4
4.6l-eatr Registered Member Join Date: Dec 2001 Location: Janesville Wi Posts: 33	115,000 miles

03-23-2002, 12:58 PM	#5
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	You can either check real oil pressure with a quality aftermarket gauge, or you can replace you existing sending unit and see what happens. The aftermarket gauge is recommended.

03-24-2002, 04:03 PM	#8
exgmguy Registered Member Join Date: Feb 1999 Location: Utica, Michigan Posts: 2,631	You are still in decent shape if you have 20 psi when it's warm at idle, and 40 on the gas.

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