When driving oil gage pressure goes up,when stopping at a red light oil gage pressure goes down and oil light comes on,as soon as i accelerate oil light goes away and oil gage pressure goes up again.what could it be?
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Well the check gauge light is telling you to check your gauges, because of the low oil pressure. It could be a sending unit problem, or the oil pressure really could be dangerously low. Should be at least 25psi at idle.
did you change the oil and filter? if the gasket leaked oil into the cooling system or coolant into the oil it.ll mess things up look at the oil, milky white? got water look at the coolant got oil? flush radiator and replace coolant i hope you did'nt put the head gasket in upside down
Yoyu dont mention the mileage on your Yukon but low oil pressure will indeed light the CES light when it reachs o psi. Have you checked your oil? Have you changed your oil and filter. High mileage and poorly maintained motors will eventually wear out and develope low oil pressure. A tempary cure would be to use a higher weight oil 20w50 will get a few more miles out of the old gal if indeed the cam, main or rod bearings have reached their service limit.. Good luck
when you press the brake pedal the brake master cylinder vacuum booster takes vacuum away from the engine and that slows the idle speed just enough to trigger the low pressure oil light. Pull the oil pressure sending unit out and hook up an oil pressure test gage, if the pressure is above 15 PSI hot engine idle in drive replace the oil pressure sending unit.