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Location: Riverdale, GA
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Oil Press Indication
86 944na..Ignition "off" gage reads Zero "0"..Ignition "On", gage reads 3.5 and no Idiot Light. Start Engine, gage reads 5 (pegged) no tapping or unusal engine noise. Leads to Oil Pressure Sender are secure. I am inclined toward a bad Oil Pressure Sending Unit. I would be greatful for your imput.
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08-16-2003, 12:07 PM
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That's where I would start. But it could be the gauge.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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08-16-2003, 03:08 PM
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Replaced Sending Unit, high oil pressure indication remains. Ignition off, indicator at zero. Ignition "on", indicator pegs at 5-bars with idiot light on. After engine start, idiot light goes out, indicator remains pegged at 5-bars regardless of eng temp or RPM. Changed oil and filter , no change. No unusual engine noises or tapping.
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08-17-2003, 11:34 AM
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Oil pressure sending unit connections swapped with no effect on pegging indicator
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85.5 944na Automatic V-65 Magna 94 Impala SS |
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08-17-2003, 11:35 AM
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Was this a new sending unit?
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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08-17-2003, 12:57 PM
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New sending unit $59.95 worth
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08-17-2003, 03:12 PM
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Eeek!
Do you have an ohm meter? Per factory workshop manuals: Post 85.1 (85.5) 1 bar = 29.6 ohms 2 bar = 65.3 ohms 3 bar = 98.9 ohms 4 bar = 133.6 ohms 5 bar = 184.0 ohms Pre 85.5 0 bar = 10.0 3 bar = 116.0 5 bar = 184.0 So there is a difference between the oil senders too... But! It's the same part number for 83 through 88 928 606 203 01. Figure that out.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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08-17-2003, 08:33 PM
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*raises hand* Done! It makes sense to me. Try taking out your Oil Pressure relief valve, seeing if it's scored or sumpin.
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*Disclaimer: The person above is actually dumber than he appears. my web site Torque values maintainance and repairs lots of my rebuild pics weights and measurements '84 944 auto/ps/ac/cc '86 951 Providing ignorance one post at a time. |
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08-18-2003, 02:51 AM
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An 86 should have the encapulated oil pressure regulator. Can get dirty but doesn't score the sides of the block and hang up. Does have o-rings that quit o-ringing though.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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08-18-2003, 06:58 AM
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bump for more imputs
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85.5 944na Automatic V-65 Magna 94 Impala SS |
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08-18-2003, 04:14 PM
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Take Hugh's figures that he posted, and use a volt/ohm meter on the wires to the gauge. See what reading you get there, now compare them to readings at the sender itself. Could be an issue between the sender, DME and gauge(if the DME relays that info that is...)
I'd of liked to of said it's a bad gauge ground, but those usually make the gauge read on the low side, not the high side.
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Jack 86 Red 951 - Turbo Twists, otherwise stock for now 83 Black 944 w/86 951 front end - still down and out, but coming back slowly. 02 Altima SE 3.5 - grocery go-getter 00 Yellow Ducati Monster 900i.e. 88 Chrysler Conquest TSi |
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08-18-2003, 04:32 PM
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Yes check the sender first with out the gauge connected. One of the terminals to the ohm meter the other lead of the ohm meter to the engine ground.
You have cleaned the engine to chassis to battery grounds? Right??
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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08-19-2003, 06:57 AM
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1983 Porsche 944 2.5 liter
'84 Porsche 944 2.5L
