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08-13-2011
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#1 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Oil Pressure Gauge
Guys,
I've been watching my oil pressure gauge during startup. When I first turn the key and start cranking, gauge bounces to 80 then bounces back towards 0, and then settles to operating pressure. Is this commonnor is it something to be concerned with? |
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08-13-2011
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#2 | |
  
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Re: Oil Pressure Gauge
Quote:
P.
__________________
Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
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08-14-2011
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#3 |
 
Join Date: Dec 2004
Location: Jacksonville, FL USA
Posts: 4,645
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Re: Oil Pressure Gauge
Okay, this is a bit embarrassing but I watch my gauge like a hawk every time I start my car.....and no the gauge is at zero till the psi comes up. It doesn't even flicker when I turn the key to the "on" position.
I would suspect the sender maybe at fault? Or if the harness section for the senders has a grounding issue? What does the oil temp behave like at start?  Tom
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1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member |
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08-14-2011
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#4 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Re: Oil Pressure Gauge
Quote:
The bouncing ONLY occurs at startup. I crank the motor, needle sweeps to 80, then sweeps back down, then back to 80. Once running and cruising it is fine and registers proper pressure which is usually right at 60psi. Could this have anything to do with the Oil Filter? I am using a silver Fram TG |
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08-14-2011
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#5 | |
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Join Date: Mar 2009
Location: Orlando, FL
Posts: 1,828
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Re: Oil Pressure Gauge
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2004 Z06/Z16 LeMans Commemorative Edition 1991 ZR-1 #302 White/Gray (sold) 1991 ZR-1 #1147 Red/Saddle (sold) |
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08-15-2011
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#6 |
Join Date: Dec 2003
Location: Chicagoland,IL
Posts: 2,679
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Re: Oil Pressure Gauge
Time to change the oil sending unit.
It's common in some ZR-1's I had this a couple FBI Z's had this issue i was one of them. It's cheap and worth to eliminate the sensor. I have the tool if you need to change it. Pete
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'91 #1635 PoloGreen 350 LT5 11.09 @ 129.27 11.04 @ 128.86 474RWHP 400RWTQ http://www.youtube.com/watch?v=SFNFOhGGlR4 http://www.youtube.com/watch?v=ZlRIOMwaDYY https://sites.google.com/site/peteszr1garage |
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08-15-2011
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#7 | |
  
Join Date: May 2007
Location: Peoria, AZ
Posts: 9,155
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Re: Oil Pressure Gauge
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No its time to replace the oil sending unit next to the oil filter housing and this is not normal. You will need a special very deep socket. Also depending upon replacement Neifoff etc the unit may be a different size than the one being removed. That has been my experience on my car. GC
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GOLDCYLON - 91 ZR-1 #2014 GOLDCYLON - 90 ZR-1 #2794, 4L60e (Formerly Schrade's) GOLDCYLON - 11 CTS-V Arizona State Director  91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat 90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat 11 RED/GREY CTS-V Last edited by GOLDCYLON; 08-15-2011 at 11:06 AM. |
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08-15-2011
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#8 |
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Join Date: Aug 2009
Location: Hamilton, Va.
Posts: 113
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Re: Oil Pressure Gauge
Just curious guys, I noticed mine acting up the last time I took it to the drag strip. It would indicate pressure and then slowly ( about 5 seconds ) move to 0. The car was running and idle was fine. I decided not to chance it and did not run again after this occurred. Started the car back up everything was fine as if nothing happened. Has been fine ever since. I wondered if it could be a sending unit . Any thoughts. It is currently working perfectly
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08-15-2011
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#9 |
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Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Re: Oil Pressure Gauge
They're cheap enough, and AZone will lend you the socket, free of charge. Can't beat that. I would want to make sure as I could that it wasn't a problem with the connection. I hate throwing parts at a problem, but in this case there isn't much to it; the sender (easy to eliminate) or the gauge (not so easy to fix) or a connection (somewhere in between, far as difficulty goes), IMO.
P.
__________________
Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
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