08 vortec max oil pressure
#4
what oil weight do you use? i live in south texas where it's always in the 90s and i use 10w-40. ive never seen less than 40 psi hot idle. you could also have a weak oil pump as well.
#5
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#7
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Change your oil and filter - I was running 20 before
I noticed my VMax stopped going into V-4 AFM like it should. I didn't think too much of it because I just replaced air filter with AEM dryflow and AirRaid MIT. I thought the truck needed to "learn" the new airflow from the mods. I even began to to think these new mods were adding more load and keeping AFM from enabling. I was about to put the stock crap back in, but then I noticed oil pressure seemd low. It was hanging around 15-20psi at idle and would go to 25 if a reved engine.
My oil life was only at 80% but I changed it anyway with 10w-30 and replaced oil filter with ACDelco and voila! Oil pressure slightly north of 40 and AFM working like a charm and picked up 2mpg. I honestyly think it was the filter. It had plenty of oil and only half quart low.
My oil life was only at 80% but I changed it anyway with 10w-30 and replaced oil filter with ACDelco and voila! Oil pressure slightly north of 40 and AFM working like a charm and picked up 2mpg. I honestyly think it was the filter. It had plenty of oil and only half quart low.
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#8
Mod with training wheels
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Same problem in my new truck here. These high volume OE pumps are known to have the pressure relief valve hang open on a poorly deburred pump housing. I lost all oil pressure on one before... My fix will be removing dod, the lifters, and swapping the high volume unit out for a standard volume melling pump.