'90 Oil Pressure Switch
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Joined: Jun 2010
Posts: 9
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From: Frederick Maryland
'90 Oil Pressure Switch
OK, '90 L98 6-speed w/a leak from the oil pressure switch that was got bad quickly. Local dealer got me a replacement switch that's a little longer but physically fits just fine. However when we tried to put everything back together last night the wiring harness won't go in. It's the right shape but original piece has 1 pin connector and the new one has 3. We even picked the part out of a schematic that placed the part in the right place next to the sender. Anybody ever come across this before? This being Sunday the parts department isn't open so I though I'd ask here ...... Thanks
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Joined: Jan 2010
Posts: 90
Likes: 4
From: Henderson Nevada
there are 2 oil switches; one is mounted straight up and the other mounted sideways on a pedistal on the block. 1 switch is for the oil gauge and the other is for the oil light. i forget which is which but i suspect the 1 wire sensor is for the light and 3 wire and tall is for the gauge. you should be able to get one at any parts house (autozone) on sunday. I had the same thing when i changed mine on my 90
Le Mans Master
Joined: Sep 2006
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From: Phoenix AZ
2021 C4 of the Year - Modified Finalist
Um, I don't think that is right.
The big one is for the gauge, and the small one runs the fuel pump if the fuel pump relay goes bad.
go to autozone, and buy one. if it isn't the same dimensions and terminals as your old one, don't buy it.
But the leaker hole can be plugged with a pipe thread plug until you get the right one and you can still drive the car.
The big one is for the gauge, and the small one runs the fuel pump if the fuel pump relay goes bad.
go to autozone, and buy one. if it isn't the same dimensions and terminals as your old one, don't buy it.
But the leaker hole can be plugged with a pipe thread plug until you get the right one and you can still drive the car.
Thread Starter
Navigator
Joined: Jun 2010
Posts: 9
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From: Frederick Maryland
Thanks for advice. A-Z had the right part. Whatta difference as far as the leak situation goes. It seems the dizzy went in 1 tooth off from where I took it out but she started up fine, just won't idle quite right. Will re-time it when I can. I had thought the single wire let the ECM know there was oil pressure and the multi-wire unit was the gauge sender?? Thanks all.........
