this just started today(oil pressure)

FLATACID · 11-18-2001, 06:02 PM

normally i get about 37psi on hot idle and 50 at 1500 and above. yesterday i was driving and the more gas i gave it, the more inconsistent it would be. it would jump from 25 to 50 and everything inbetween. any ideas?

these are brand new autometer electric gauges. not stock.

5ohCOUPE · 11-18-2001, 09:20 PM

My oil pressure did that for a couple of days then my oil pump locked up. It could be the same thing in your case.

FLATACID · 11-18-2001, 10:42 PM

hmm. i'll look into that. anybody else?

Idhomustang · 11-18-2001, 11:25 PM

A-wooo ouch, might pull your sender and screw in a manual guage right at the block and leave the new system hooked up. Compare the two readings, see which one make the most sense. Is the motor making noise? Did you thrash it hard last night? It is possible to have a oil pump go bad, very common especially if the engine is a high miler.

I hope it is the new guage going bad and not tyhe pump, much easier to fix.. Mac

PKRWUD · 11-20-2001, 05:29 AM

I agree that you should verify the problem with a mechanical gauge before you do anything else. It sounds like a sending unit problem to me.

Take care,
-Chris

agawam · 11-20-2001, 10:31 AM

stock ford oil pumps are junk drop the pan and put in a melling also check the mounting point on the pickup tube I have found leaks there

KobraLX · 11-20-2001, 02:13 PM

Had the same problem. Replaced the oil pressure sending unit and it was fine. It is on the driver's side of the motor ahead of the header. It has one wire coming into the top of it. Unplug and screw it out and the new one back in and plug up. At least this worked on my 89.

FLATACID · 11-20-2001, 08:37 PM

after reading more and more on it, i am going to have to side with the oil pump. if it was the sender, than wouldn't it jump around at idle also? also the more gas i give it the worse it gets. since its mechanically driven...?

i still plan on checking the gauge though.

2FastLX · 11-21-2001, 01:59 AM

How's this scenario sound:
It may be the oil pump pickup screen getting clogged. When you rev it up it sucks more oil through, causing particles to wedge harder into the screen causing oil pressure to be erradic. I had this problem with a 318 once. The guy I bought the truck off of thought RTV Blue was supposed to be used in 1/4" beads on EVERYTHING. The screen was so plugged you couldn't pull the sh!t out of it. Needless to say it thrashed the engine a couple days after I bought the truck.

Before you drive it any more find out what the hell it is!

11-18-2001, 06:02 PM	#1
FLATACID Registered Member Join Date: Nov 2001 Location: Walnut Creek, CA Posts: 5	this just started today(oil pressure) normally i get about 37psi on hot idle and 50 at 1500 and above. yesterday i was driving and the more gas i gave it, the more inconsistent it would be. it would jump from 25 to 50 and everything inbetween. any ideas? these are brand new autometer electric gauges. not stock. __________________ mods: dumped ultra flo's, moroso air intake, frpp underdrive pulleys, florida 5.0 guages, 3g alt

11-18-2001, 09:20 PM	#2
5ohCOUPE Registered Member Join Date: Sep 2001 Location: ORANGE PARK FL. USA Posts: 208	My oil pressure did that for a couple of days then my oil pump locked up. It could be the same thing in your case. __________________ 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.

11-18-2001, 10:42 PM	#3
FLATACID Registered Member Join Date: Nov 2001 Location: Walnut Creek, CA Posts: 5	hmm. i'll look into that. anybody else? __________________ mods: dumped ultra flo's, moroso air intake, frpp underdrive pulleys, florida 5.0 guages, 3g alt

11-18-2001, 11:25 PM	#4
Idhomustang Registered Member Join Date: Sep 1999 Location: boise,idaho Posts: 220	A-wooo ouch, might pull your sender and screw in a manual guage right at the block and leave the new system hooked up. Compare the two readings, see which one make the most sense. Is the motor making noise? Did you thrash it hard last night? It is possible to have a oil pump go bad, very common especially if the engine is a high miler. I hope it is the new guage going bad and not tyhe pump, much easier to fix.. Mac __________________ 393,9.5" 351W,830 Holley,Victor Jr,Home made Cool Air Pan, Pro Billet MSD, MSD 6AL, XE 284H Xtr-Com cam, 240-246 @.050, 540-544, M/T Et streets, Mac Upper and Lower, Control Arms, 3:73 US Gear,Mini Spool, Eagle Long rods, Mac Windage tray, KB Pistons, Scat crank, 4000 rpm stall convertor, C-4 trans, Airflow Research 185cc, Hooker long tubes 3", exhaust, S&W 6 point roll cage, 11.2 at 121 mph.

11-20-2001, 05:29 AM	#5
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	I agree that you should verify the problem with a mechanical gauge before you do anything else. It sounds like a sending unit problem to me. Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

11-20-2001, 10:31 AM	#6
agawam Registered Member Join Date: Sep 2001 Location: agawam ma usa Posts: 39	stock ford oil pumps are junk drop the pan and put in a melling also check the mounting point on the pickup tube I have found leaks there __________________ agawam performance owner

11-20-2001, 02:13 PM	#7
KobraLX Registered Member Join Date: Mar 2001 Location: Hillbilly Cajun Posts: 25	Had the same problem. Replaced the oil pressure sending unit and it was fine. It is on the driver's side of the motor ahead of the header. It has one wire coming into the top of it. Unplug and screw it out and the new one back in and plug up. At least this worked on my 89.

11-20-2001, 08:37 PM	#8
FLATACID Registered Member Join Date: Nov 2001 Location: Walnut Creek, CA Posts: 5	after reading more and more on it, i am going to have to side with the oil pump. if it was the sender, than wouldn't it jump around at idle also? also the more gas i give it the worse it gets. since its mechanically driven...? i still plan on checking the gauge though. __________________ mods: dumped ultra flo's, moroso air intake, frpp underdrive pulleys, florida 5.0 guages, 3g alt

11-21-2001, 01:59 AM	#9
2FastLX The Photoshop Guru Join Date: Feb 2001 Location: Mecca, Indiana Posts: 1,419	How's this scenario sound: It may be the oil pump pickup screen getting clogged. When you rev it up it sucks more oil through, causing particles to wedge harder into the screen causing oil pressure to be erradic. I had this problem with a 318 once. The guy I bought the truck off of thought RTV Blue was supposed to be used in 1/4" beads on EVERYTHING. The screen was so plugged you couldn't pull the sh!t out of it. Needless to say it thrashed the engine a couple days after I bought the truck. Before you drive it any more find out what the hell it is! __________________ Project: 1988 Coupe - EFI 5.8L Twin Turbo with Victor intake, Canfield heads, F303 cam, March aluminum underdrive pulleys, TKO (or T56 if funds permit), PBR twin piston calipers and 13" rotors up front, 94 Cobra rear calipers and 12" rotors on the rear, 3.73's, Griggs K-member, tubular front control arms, torque arm and panhard bar, polished 99 Cobra wheels. "The GR-40 kit installation is now complete, and the humble Fox-chassis car will now out-corner and out-stop a ZR-1 or a Viper, and support massive horsepower additions with perfect balance." Griggs Racing ICQ# 42269241

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