Low oil pressure? - Alfa Romeo Bulletin Board & Forums
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post #1 of 26 (permalink) Old 02-24-2019, 09:52 AM Thread Starter
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Low oil pressure?

Took the Alfa out yesterday and didn't realize my oil pressure was extremely low.

Decided to take the car out again today to check it out and it is on the red when not moving.

When I drive, it will go up one line.

I checked the oil level and it was not low. It was normal.

What could the potential issues be?

I don't work on my Alfa myself so I will need to bring it to the mechanic.

Should I bring it to my dedicated Alfa mechanic 90 minutes away or can I have the local "European" garage in the neighborhood diagnosis / fix it?

Clearly the Alfa mechanic would be the best choice, but he is not that close.

For small things like oil changes, air filter, brakes, etc., I just go to the local European guy here.

For this issue, do you think it would be fine to have him look at it?

Thanks
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post #2 of 26 (permalink) Old 02-24-2019, 10:06 AM
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Originally Posted by lgbalfa View Post
Took the Alfa out yesterday and didn't realize my oil pressure was extremely low.



Decided to take the car out again today to check it out and it is on the red when not moving.



When I drive, it will go up one line.



I checked the oil level and it was not low. It was normal.



What could the potential issues be?



I don't work on my Alfa myself so I will need to bring it to the mechanic.



Should I bring it to my dedicated Alfa mechanic 90 minutes away or can I have the local "European" garage in the neighborhood diagnosis / fix it?



Clearly the Alfa mechanic would be the best choice, but he is not that close.



For small things like oil changes, air filter, brakes, etc., I just go to the local European guy here.



For this issue, do you think it would be fine to have him look at it?



Thanks


Here is my opinion and only my opinion - I know there are much smarter guys out there than me. All ways start with the easy test first. It might just be the gauge or oil pressure sending unit. I bet the local garage can test it. Call ahead or drop by and asked European if they want to test it you. Do not drive the car with out oil pressure. Internal damage is very expensive? You will not know what you are working with until you know if the gauge or sending unit is working. PS check your fuses! Good Luck


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post #3 of 26 (permalink) Old 02-24-2019, 10:09 AM
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Lambert,

It is probably the gauge or sensor or wire? The oil light would most likely come on if pressure was low.

Look at #2 in dash lights


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post #4 of 26 (permalink) Old 02-24-2019, 10:15 AM Thread Starter
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Thanks for the feedback.

I am thinking of buying this (oil pressure sender) and bringing it with me to the local European guy this weekend.

https://www.ebay.com/itm/Original-En...n4XK:rk:5:pf:0

Hopefully it is something as simple as that.

Will keep everyone posted.

Thanks

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post #5 of 26 (permalink) Old 02-24-2019, 11:37 AM
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Quote:
Originally Posted by lgbalfa View Post
Thanks for the feedback.

I am thinking of buying this (oil pressure sender) and bringing it with me to the local European guy this weekend.

https://www.ebay.com/itm/Original-En...n4XK:rk:5:pf:0

Hopefully it is something as simple as that.

Will keep everyone posted.

Thanks


Lambert,

Take a look under the hood and make sure the sender wire is hooked up, if it is, unplug it and replug it in, maybe it is oxidized?

Kevin


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post #6 of 26 (permalink) Old 02-24-2019, 11:57 AM
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Hi Lambert,

first test before anything is to remove the wire from the OP sender (this is screwed into the block above the starter motor, not the one near the oil filter) and ground it with IGN on....if your OP gauge now goes to full MAX it means the gauge is good but the sender is bad (very common, a bad sender)

If you find the wire is not even connected, that is your problem

If by grounding that single black/red wire does not send the instrument gauge to MAX, then you have a wiring problem to or within the gauge.

https://www.alfabb.com/bb/forums/6563682-post2.html

The correct sender for our S4s is originally the alfa P/N: 60507261
search that and you should find a correct replacement.
About 55$ over here.

BTW: to change it out, you need a 'thin' wrench, either 14 or 17mm depending, as the wrench needs to fit between sender and engine block and the space is limited. You can reach it with a long arm going in from the front under the plenum. Something you could do in 15 mins yourself, but sure any garage could do for you.

EDIT: Important when /if changing that sender....disconnect battery as the starter wires are very close and if your wrench touches those.....
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Last edited by spiderserie4; 02-24-2019 at 12:14 PM.
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post #7 of 26 (permalink) Old 02-24-2019, 01:19 PM Thread Starter
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Thanks everyone for the feedback.

I'll report back when I get a chance to look at the car / take to mechanic.

1992 Alfa Romeo Spider Veloce, 2017 Alfa Romeo Giulia, 2018 Volkswagen Tiguan SEL Premium
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post #8 of 26 (permalink) Old 02-24-2019, 04:19 PM
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Quote:
Originally Posted by kevinl View Post
The oil light would most likely come on if pressure was low.
Right!

In addition, Alfa oil pressure senders tend to fail by giving low readings, so the odds are good that your sender is the problem.

There's nothing Alfa-specific about this issue, so your local European repair guy should be able to handle it. Ask him to test the pressure with a mechanical gauge, which will probably show that it is fine.

Don't buy the replacement sender you found on ebay - that one (ebay photo duplicated below) is for the warning light; not for the gauge. The second photo below is the gauge sender, and as spiderserie4 wrote, they cost ~$55. But let the mechanic source any parts that he needs.




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Last edited by Alfajay; 02-25-2019 at 11:57 AM.
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post #9 of 26 (permalink) Old 02-25-2019, 11:55 AM
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Lead plug fallen out of the crankshaft ?

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post #10 of 26 (permalink) Old 02-25-2019, 12:20 PM
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Originally Posted by giulia_veloce View Post
Lead plug fallen out of the crankshaft ?
Was one of my thoughts, FWIW the simple problems never happen to me, it's always the crank plug, may the Alfa Gods and the Force be with you.

Cars ruined my life! 😱
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post #11 of 26 (permalink) Old 03-10-2019, 09:44 AM
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The crank plugs are aluminum, there are four of them, one for each rod journal cross drilling. When they fall out, they get trapped in the gunk around the windage tray in the oil pan. If your lucky, they fall out when you drain the oil.
If you have your mechanic replace the oil sending unit, have him drain the oil and look for an alloy plug. The photo shows what new ones look like, when you install them, you have to cut the excess off and then swedged them into the crank along with the BEST Loctite you can find, I use bearing race RED.
BTW the four in the photo are for sale, PM me if interested.
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post #12 of 26 (permalink) Old 03-10-2019, 10:00 AM
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less likely the crank plugs.....

with the S4 spider, one little improvement was the use of threaded plugs.
(photo: Vin's engine rebuild thread)
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post #13 of 26 (permalink) Old 03-10-2019, 03:15 PM
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S- 4 Spider's Rule!!!

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post #14 of 26 (permalink) Old 03-10-2019, 04:44 PM
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msiert - Since you are such a fan of the series 4 Spider, I have the factory press kit for 1990 which has the intro to the 164 and series 4 Spider for sale in the classifieds.
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post #15 of 26 (permalink) Old 03-11-2019, 06:40 PM
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Originally Posted by Elwood625 View Post
msiert - Since you are such a fan of the series 4 Spider, I have the factory press kit for 1990 which has the intro to the 164 and series 4 Spider for sale in the classifieds.
Nice, I'll check it out.

Thank you!

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