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gaytrey1987
Joined: 09 Jun 2007
Posts: 7
Location: Springfield, MO / Bentonville, AR
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 Posted: Tue Jun 19, 2007 12:57 pm Post subject: Irratic Oil Pressure Light *blinkage?* |
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Are oil pumps a part that are prone to defect in the 2.0 liter Porsche motor? I think it may be a wiring glitch, but I'm not sure... my car has had a fresh oil change and filter, is filled to max, and I'm getting a lot of blinking out of my oil pressure light while at rpms below 3000 (most of the time). The oil pressure gauge is also being really jumpy.
Input is appreciated.
Will S.
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Will S.
1991 Dodge Stealth R/T AWD Twin Turbo
1990 Dodge Grand Caravan Twin Turbo
1981 DeLorean DMC-12 Gas-Flap Hood
1978 Porsche 924
A wise 924 owner has two: one for parts, and one that starts. |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Tue Jun 19, 2007 1:23 pm Post subject: |
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Check grounds, battery to body, motor to body, and ground cluster under dash.
Is this the soaking wet car?
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Mike924
Joined: 12 Aug 2004
Posts: 2601
Location: IoW UK
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| Posted: Tue Jun 19, 2007 5:14 pm Post subject: |
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^+1 + check connection to oil pressure sender at the back of the cylinder head.
BTW, Will, you've just lost your geek credentials by spelling 'erratic' wrong! 
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd
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Ozzie
Joined: 12 Mar 2005
Posts: 4448
Location: Townsville, Qld. Australia
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| Posted: Tue Jun 19, 2007 5:21 pm Post subject: |
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Usually wiring or bad grounds.
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Smoothie
Joined: 01 Jan 2003
Posts: 8032
Location: DE (the one near MD, PA, NJ)
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| Posted: Tue Jun 19, 2007 11:43 pm Post subject: Re: Irratic Oil Pressure Light *blinkage?* |
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| Quote: | | Are oil pumps a part that are prone to defect in the 2.0 liter Porsche motor? |
The oil pumps seem to be pretty robust. Some have had to deal with the built-in pressure relief valve, but the pumps themselves are very good (usually ).
With the light blinking, I'd suspect maybe some of the foil insulation on the firewall is to close to the sender at the back of the cyl head.
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Slam
Joined: 07 Jan 2005
Posts: 1689
Location: Wainwright, Alberta, Canada
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| Posted: Wed Jun 20, 2007 2:31 am Post subject: |
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Sounds like rod bearings... But make all the checks these guys have suggested first. Can you plumb in an oil pressure gauge apart from the one in-dash?
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'84 944 - kid blew motor
'83 944 - resting comfortably. For 12 years
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'77 924 - rusting comfortably |
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924RACR
Joined: 29 Jul 2001
Posts: 9071
Location: Royal Oak, MI, USA
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| Posted: Wed Jun 20, 2007 3:33 am Post subject: |
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I'd fully expect it's electrical.
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'79 924 #77 SCCA H Prod racecar
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Paul
Joined: 02 Nov 2002
Posts: 9491
Location: Southeast Wisconsin
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| Posted: Wed Jun 20, 2007 10:47 am Post subject: |
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Probably electrical, but it's a 5 minute job to remove and clean the pressure relief valve, so go for it.
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
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Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy. |
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geddes66
Joined: 10 May 2003
Posts: 129
Location: Bakersfield CA
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| Posted: Sat Jun 23, 2007 9:31 am Post subject: |
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What is your pressure doing at said 3000 RPM avraging the jumps?
Does it "blink" the same both cold and hot?
Please post removal procedures for pressure relief valve.
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Paul
Joined: 02 Nov 2002
Posts: 9491
Location: Southeast Wisconsin
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| Posted: Sat Jun 23, 2007 11:14 am Post subject: |
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It's held in place by the large cover (looks like a large nut) on the end of the oil pump. Its to the left (when standing over the open engine bay) and sligthly lower than the center of the front pulley.
Just unscrew it and the spring and piston will fall out (catch it). Clean the parts and the bore and put it back together.
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White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy. |
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gaytrey1987
Joined: 09 Jun 2007
Posts: 7
Location: Springfield, MO / Bentonville, AR
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| Posted: Sun Jun 24, 2007 8:21 pm Post subject: |
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| Slam wrote: | | Sounds like rod bearings... But make all the checks these guys have suggested first. Can you plumb in an oil pressure gauge apart from the one in-dash? |
RIP 1978 Porsche 924
Cause of death: #3 cylinder connecting rod bearing
Engine gave no sign of death aside from a blinking oil light and erratic oil pressure. The car croaked on the side of the road in Bentonville, Arkansas on my way back to the office from lunch. She started missing all of a sudden, and a block later, she coasted klutzily into a ditch where she shuddered, sputtered, and died. We pulled it back to the house, it wouldn't start with the starter, but we did get it to crank and remain running from pull starting it, dead miss on #3, engine eventually siezed, and is being taken out to be re-built or to be transplanted with a Toyota 22RE-T. I haven't decided which will be more difficult: Rebuilding a porsche engine, or transplanting the porsche wiring and engine with that from an 89 Toyota Pickup Truck..... eek. I hate restoring cars on a budget. |
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Mike924
Joined: 12 Aug 2004
Posts: 2601
Location: IoW UK
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| Posted: Mon Jun 25, 2007 12:26 am Post subject: |
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What makes you think it's the con rod bearing?
A broken rod bearing wouldn't cause all the symptoms you mentioned. Although it does sound pretty terminal, all told. 
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1985 Porsche 924 'Lux', Kalahari Beige (my ex)
1993 Porsche 968 Coupe, Midnight Blue, 6 spd
'There is no substitute for a little grease under your fingernails.' - Chrenan, 924board.org |
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