More low oil!
More low oil! I read around for the last week, couldn't come to a conclusion. My problem seems a little different then the ones that ive been seeing here.
Just some background..
LS1 with mods in sig, haven't tuned after LT's were put on. No cats, so multiple SES codes for O2 sensors.
Codes: P0157, P0160, P0420, P1153.
So at cold start, she'll idle at around 40psi give or take, and at warm start, maybe 30. When accelerating it will drop significantly, 10-20 some days, 0 others. When 0, Check gauges comes on.
Last night, for the first time I heard tapping from the lifters around 2,500 rpms, and the gauge would drop to 0 if i gave it some juice.
Took it to my mechanic, he ran an analogue gauge to check and see if the one on my dash was the problem, since it ran fine. analogue gauge showed same thing, low psi all around, 40ish at idle.
He says that the oil is pretty black and should get changed (last change <1600k). I asked him to Seafoam it and we'll change it after the foam does some work.
So aside from possible sludge, think there's something else going on?
Just some background..
LS1 with mods in sig, haven't tuned after LT's were put on. No cats, so multiple SES codes for O2 sensors.
Codes: P0157, P0160, P0420, P1153.
So at cold start, she'll idle at around 40psi give or take, and at warm start, maybe 30. When accelerating it will drop significantly, 10-20 some days, 0 others. When 0, Check gauges comes on.
Last night, for the first time I heard tapping from the lifters around 2,500 rpms, and the gauge would drop to 0 if i gave it some juice.
Took it to my mechanic, he ran an analogue gauge to check and see if the one on my dash was the problem, since it ran fine. analogue gauge showed same thing, low psi all around, 40ish at idle.
He says that the oil is pretty black and should get changed (last change <1600k). I asked him to Seafoam it and we'll change it after the foam does some work.
So aside from possible sludge, think there's something else going on?
Most of the memebers helped me out with low oil issues they told me the gauge is sometimes off and to check it with a mechanical gauge. My car was dripping small spots of oil now then and it was due to a clogged and broken pcv hose, after I replaced that my oil gauge started working better as well.
Lifters tapping and low oil pressure on 2 different gauges... I would be replacing the oil pump. Less than 10psi of oil pressure can start to wreck bearings, so I wouldn't run it much until you get it figured out.
Yea I would replace pump and check pickup oring, but disassemble the old pump because that will most likely show if that was your problem. A lot easier to replace oil pump then bearings, cheaper too.
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TECH Senior Member
Joined: Apr 2002
Posts: 6,080
Likes: 17
From: So.Cal.
I just tore my motor down because of blow-by. It didn't effect my oil pressure. If you were getting enough contamination in the crankcase to break the oil down surely you would see blue smoke out of the exhaust as well. Once the oil thins out it's going to go right past the rings and you'll have oil consumption problems. I never saw any mention of oil consumption. Isn't blow-by because of bad rings!