Question about Pontiac Grand Am

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Can oil pressure be regained after a substantial loss due to faulty sending unit? (if oil cahnge don't seem to be enough!)

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  • loni grindle Apr 19, 2009

    at this point yes, it is only a suspision. considering that the sending units are notorious for failing i figured it would be the main culprit! the the oil pressure will be tested in the morning but its evident that their has been a loss. any suggestions i may want to check into regarding possible loss' ?

  • Roberta Smith
    Roberta Smith May 11, 2010

    loss of oil pressure can be anything from not enough oil in the oil pan to a failed oil pump... excessive engine wear in particular the crankshaft bearings... or cam bearings.... how many miles do you have on that engine ? incidentally.... whenever your oil pressure drops your first thought should be that the oil pump has failed.... stop driving it till your oil pressure is checked... low oil pressure can lead to alot of engine problems

  • Roberta Smith
    Roberta Smith May 11, 2010

    you suspect it is the sending unit.... you have had the oil pressure checked ?

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Your oil pressure can be effected by several things. If you visually look at the sensor with the vehicle running you can usually see the oil coming out of the top of the sensor. Also look at the engine to see where oil is dripping from. Valve cover gaskets, pan gaskets, front and rear oil seals all have a tendency to leak especially the rear seal.
Regarding your oil pressure, if the oil is full then you should have pressure unless the pump is bad. The only other reasons for lower oil pressures are if you ran the engine out of oil and spun a bearing or two. Got the engine hot and caused the oil pressure bypass spring to loose its strength thus lowering the pressure. A plugged oil filter, etc. can lower it also. If you have a newer vehicle, they are built to run at lower oil pressures than older carburated vehicles do. This is the biggest reason that newer vehicles have no oil pressure gage in them. Good Luck, RAC

Posted on Apr 19, 2009

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