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Removed Oil Pressure Switch Now Won’T Run


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#1 minicooperr

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Posted 23 July 2020 - 03:14 PM

Should my car run without the oil pressure switch?

I removed it to fit an oil pressure gauge and was having problems with leaking t piece but now the starter motor just spins and doesn’t engage?

#2 nicklouse

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Posted 23 July 2020 - 03:29 PM

depends on the car. what is it?



#3 minicooperr

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Posted 23 July 2020 - 04:03 PM

It’s an spi engine in an older car with a carb no injection

Edited by minicooperr, 23 July 2020 - 04:03 PM.


#4 johnR

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Posted 23 July 2020 - 04:35 PM

Surely if the starter's spinning but not engaging that is a separate issue? The oil pressure switch just causes the warning light to operate if pressure drops?



#5 whistler

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Posted 23 July 2020 - 06:22 PM

Sounds like you've pulled a wire off the starter solenoid.



#6 minicooperr

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Posted 23 July 2020 - 06:23 PM

Surely if the starter's spinning but not engaging that is a separate issue? The oil pressure switch just causes the warning light to operate if pressure drops?


Yeah that’s what I was hoping it’s just I have just taken the switch off and now it won’t run is what I was asking the question

#7 mini-mad-mark

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Posted 23 July 2020 - 08:11 PM

I had a Metro Turbo where I believe the oil pressure switch was linked to the (electric) fuel pump to stop the car running until there was oil pressure (to protect the turbo methinks)

 

Not sure that's a thing on an SPi (maybe on an MPi?) - guess a quick flick of the circuit diagram on here will tell you, although if its a function of the ECU then it might not be clear (I have looked at the SPi and MPi wiring diagram just for interest but never needed to study them)



#8 mini-mad-mark

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Posted 23 July 2020 - 08:23 PM

Had a quick look at the WD and doesn't seem that the oil pressure switch is linked into anything to stop the car running/starting (although I might be wrong)

 

Guess whistler is on the right track; you may have disturbed something else inadvertently.



#9 Tornado99

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Posted 26 July 2020 - 09:29 PM

Never seen a car with a pressure switch that disables engine. If you think about it, so huge liability concerns if system just shuts down engine no matter what situation you might be driving in, like trying to get out of way of an oncoming truck.
Your issue lies elsewhere.

#10 mini-mad-mark

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Posted 27 July 2020 - 11:46 AM

Well here you go: (from the Haynes manual Metro Turbo page)

 

Attached File  Capture.JPG   21.47K   0 downloads

 

(35 oil pressure switch 72 fuel pump relay)

 

 



#11 mini-mad-mark

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Posted 27 July 2020 - 11:47 AM

But not on a mini I don't think



#12 jaysmini1983

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Posted 27 July 2020 - 12:22 PM

I have just tested this on my 1275 on hif carb, plugged in or not it made no difference.

Your problem is elsewhere as previously mentioned.






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