76 280 Low oil pressure when idling - Mercedes-Benz Forum

 
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post #1 of 8 (permalink) Old 03-25-2012, 10:16 PM Thread Starter
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76 280 Low oil pressure when idling

Hello,
Can anyone shoot some advice my way on this most recent issue? About a month back my car started showing signs of Temp rising while sitting at lights or drive thru's. The gauge will go almost to the 3rd line (next line being HOT)... Once I accelerate, the temp goes back to normal..Immediately!!!

Now, while I am sitting at lights it seems like I am idling very rough, almost as if she wants to stall,,,but she hasn't ...YET. during this my oil gauge will read near 15 which is low...As soon as I accelerate or if I put the car in neutral, the gauge reads pretty much full pressure 45...

any ideas on what this could be? I was running low on oil and put a 5-30 weight oil..From what I have been reading, these cars need a 20-50 for this Cali weather..any suggestions are appreciated...

Thank you
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post #2 of 8 (permalink) Old 03-26-2012, 06:48 AM
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Low idle speed and overheating, sounds like two different issues. Is your idle set fast enough. too slow of idle speed can cause stalling and low oil pressure. If not that, maybe tune up parts(plugs,cap,rotor ,wires,points etc). check for low coolant also.
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post #3 of 8 (permalink) Old 03-26-2012, 09:09 AM
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Quote:
Originally Posted by ktmripper View Post
Low idle speed and overheating, sounds like two different issues. Is your idle set fast enough. too slow of idle speed can cause stalling and low oil pressure. If not that, maybe tune up parts(plugs,cap,rotor ,wires,points etc). check for low coolant also.
I agree with ktmripper on the low idle speed/near stalling being the cause of the low oil gauge.

The overheating problem could be the signs of a failing water pump, or low coolant as he suggested. Take the cap off the radiator while the car is running, if fluid runs out or isn't moving chances are the water pump is bad... don't do it when the fluid is hot...
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post #4 of 8 (permalink) Old 03-26-2012, 11:38 AM
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First, remove the thermostat and test and replace.
They do not last forever and the response lags when compared to new.

Flush and clean the coolant.

When idling and the temp rises,
turn the heater levers on and if the temp drops,
it may be the radiator.

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post #5 of 8 (permalink) Old 03-26-2012, 06:23 PM
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The oil pressure, when hot, will drop to 15 psi, or '1', and is normal. Once you accelerate, it will go back up to 45, or '3' on some models.

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post #6 of 8 (permalink) Old 03-28-2012, 03:21 AM
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I have the same problem with my '75 450SL. When I stop for a red light, it drops really
low, 5-10 and I made sure my husband put 7.5 qt. In it, found the book and books says
put in 10w40,I questioned that, as the book is 37 yrs old an things change.
Also while I here,I can't get the heat work and again using the owners manual for direction, plus is it possible to wire the AC to run all the time. I 'm afraid to mess with
because it does work, I just hate running the AC with the top down. Does anyone have any idea that could help.
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post #7 of 8 (permalink) Old 03-29-2012, 11:22 PM Thread Starter
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Thanks..
I think my radiator was bone dry. I filled it up with water and believe the temp is doing better. My idle is very rough. Sounds and feels like she wants to stall. Once I take off from sitting at a light it smells like exhaust in the cab of my car. The smell dissipates until I sit for another light..smells like I'm running super rich..no mechanic here. Just trying to get logical ideas. Thanks again
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post #8 of 8 (permalink) Old 03-29-2012, 11:56 PM
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If it was dry there must be a leak, check the lines where they connect and the length of the hoses to locate the source.

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