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portreathbeach
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Joined: 09 Aug 2015
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PostPosted: Tue Oct 08, 2019 8:33 pm    Post subject: Oil pressure question Reply with quote

I've had my 2004 Carrera S for a month now and the oil pressure was always between 4 and 5 even on tick over. Most of the time it was up around 5.

Anyway, tonight I took the car out for a blast and now the oil pressure seems to be around 3 at tick over and goes up and down depending on revs. This is kind of what I would have expected it to do all along.

Anyone have any idea what is going on, or what was going on before?
 
  
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911UK
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1997 Porsche 993 Carrera 2

PostPosted: Tue Oct 08, 2019 8:47 pm    Post subject: Reply with quote

tick over should be circa 1.5 bar

so might have a sensor fault, worth getting a Porsche diagnostic machine check
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portreathbeach
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PostPosted: Tue Oct 08, 2019 9:07 pm    Post subject: Reply with quote

It's really the first time I've driven it fairly hard, and kept the revs up in Sport mode. Just wondering if it's only been up around 5 bar most of the times I've driven it before because the engine was cooler. Although all the times I've driven it before, I have had the engine temp at 80C and the Oil at 90C.

Will have to see what it's like tomorrow.
 
  
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kurlykris
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Joined: 30 Jun 2014
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PostPosted: Tue Oct 08, 2019 9:23 pm    Post subject: Reply with quote

With the ignition on ( engine not started ) the oil pressure should be 0 Bar, hot engine and the pressure should be 1-1.5 Bar at tickover and rise with an increase in revs all the way up to 4-5 Bar at full chat, sounds like you may have a dodgy oil pressure sender unit Question
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portreathbeach
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PostPosted: Tue Oct 08, 2019 9:55 pm    Post subject: Reply with quote

Thanks kurlykris.

I’ll check out exactly what it’s doing tomorrow.

I just had a look online at changing the sensor. Doesn’t look too tricky, just need a 19mm crow foot spanner by the looks of it.

If the sensor is faulty, should it be replaced with an original Porsche one, or is the cheaper Bosch one just as good?
 
  
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kurlykris
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PostPosted: Tue Oct 08, 2019 10:14 pm    Post subject: Reply with quote

Obviously Porsche don`t actually make the sender unit themselves, it`s probably Bosch, so GSF or ECP or your local car parts place can get the same thing but much cheaper Grin

Just make sure that the oil pressure guage reads 0 without the engine running and ignition turned on, if it doesn`t then it is no good.

A 10 mile drive max will see the engine coolant and oil up to operating temp and at tickover should be 1-1.5 Bar Thumb
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portreathbeach
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PostPosted: Wed Oct 09, 2019 9:07 pm    Post subject: Reply with quote

OK.

If I put the keys in and turn on the car (not start the engine), the oil pressure reads about 0.5 bar. (A couple of times it read 2 bar).

When the engine and oil are up to temperature, the gauge reads 5 bar most of the time unless at idle, where it drops to 3.5 - 4 bar.

Does this sound like the pressure sensor needs replacing?

If the oil pressure sensor needs replacing, is this the one I need for a 2004 997.1...

https://www.design911.com/Porsche/997-MKI--911--2005--08/Oil-Pressure-Senders---Switches/pt856_859_2373_-cma81-cmo117/
 
  
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kurlykris
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Joined: 30 Jun 2014
Posts: 2524
Location: Warwickshire


PostPosted: Wed Oct 09, 2019 9:24 pm    Post subject: Reply with quote

Yes ignition on, and engine not running, the oil pressure should always be 0 Thumb

Yes your link looks like the correct unit, the part number 99660620303 looks to have superseded the older 301 and 302 part numbers.
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portreathbeach
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PostPosted: Thu Oct 10, 2019 9:01 pm    Post subject: Reply with quote

Turned the ignition on today and the oil pressure read 2 bar without the car running. I think the sensor is definitely defective.

A the car is going in for a major service in a couple of weeks time, the garage have ordered a sensor on a sale/return, so they can test the old one and fit the new one if required.
 
  
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bazhart
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Joined: 20 May 2009
Posts: 969
Location: Bolton Lancashire


PostPosted: Fri Oct 11, 2019 4:30 am    Post subject: Reply with quote

The condition you describe is often caused by a small piece of debris material getting stuck in the hole leading into the sensor and holding some pressure inside it even when the engine has stopped.

New sensor will probably fix it.

Baz
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deMort
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Joined: 21 Mar 2015
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Location: Brighton


PostPosted: Fri Oct 11, 2019 7:19 pm    Post subject: Reply with quote

Agree

Pretty common and 95% of the time it's a new sender unit that's required .
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