LS1 low oil pressure.
Thread Starter
Teching In
Joined: Dec 2012
Posts: 33
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LS1 low oil pressure. To make a long story short. I have an 02 TA an ls1 with 154000 miles. I had a head gasket started leaking on me. And I ended up doing several other upgrades.
Ported, polished, and milled heads, mild cam, 3600 stall, and build 4l60e.
Before I did any work the car it idled around 45 psi at 2000 rpm it was 60psi, 4000 Rpm 70 psi and 6000 Rpm it would peg the gauge at 80 psi.
After the build it ran around that some oil pressure for about a week.
I got in one night after work I noticed and at a idle I had 20 psi, 2000 Rpm 25 psi. So I changed the cam gasket again. It helped some I had 25 psi at idle but still have 25psi at 2000 Rpm.
I am by no means a ls expert but I have had my hands on a few small block chevy. I think it's the oilpump is. Going out or the pick up is leaking oil back in.the sump. Is there something else I should check first.
Ported, polished, and milled heads, mild cam, 3600 stall, and build 4l60e.
Before I did any work the car it idled around 45 psi at 2000 rpm it was 60psi, 4000 Rpm 70 psi and 6000 Rpm it would peg the gauge at 80 psi.
After the build it ran around that some oil pressure for about a week.
I got in one night after work I noticed and at a idle I had 20 psi, 2000 Rpm 25 psi. So I changed the cam gasket again. It helped some I had 25 psi at idle but still have 25psi at 2000 Rpm.
I am by no means a ls expert but I have had my hands on a few small block chevy. I think it's the oilpump is. Going out or the pick up is leaking oil back in.the sump. Is there something else I should check first.
Have you hooked a mechanical gauge up to it to see what it's true reading is? These oil sending units aren't the best in these cars and if you replaced it with one from a local parts store recently, those have all read lower in my experience. I'd throw a mechanical gauge on it and see what it reads.
Have you hooked a mechanical gauge up to it to see what it's true reading is? These oil sending units aren't the best in these cars and if you replaced it with one from a local parts store recently, those have all read lower in my experience. I'd throw a mechanical gauge on it and see what it reads.
Yeah, the cluster gauges aren't the most accurate by any means. I'd hook up a mechanical gauge and check.
Thread Starter
Teching In
Joined: Dec 2012
Posts: 33
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Have you hooked a mechanical gauge up to it to see what it's true reading is? These oil sending units aren't the best in these cars and if you replaced it with one from a local parts store recently, those have all read lower in my experience. I'd throw a mechanical gauge on it and see what it reads.
Thread Starter
Teching In
Joined: Dec 2012
Posts: 33
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I tried the 3 local part stores Oreily's, advanced, and autobone, with all of them reading about 10psi or so lower than what the mechanical gauge read, give or take a couple psi. I ended up going to the junkyard and just grabbing a couple off of trucks (I think around 00-02 year but I can't remember?) that had the same connection as our ls1. Once I popped it in, everything was good to go. For some reason these part store ones don't read as good as an oem one in my experience.
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I replaced my oil pump when it was torn down for the H/C/I swap and I only had 17,000mi on the odometer at the time. Probably did not need to but I figured 100.00 was cheap insurance. I could not fathom tearing down a 150,000 mile engine and not replacing the lifters, timing chain, oil pump, o ring, and retainer plate seal. That is what 2-300.00 in parts that could potentially save thousands down the road.