Oil Pressure getting worse on LS6 pump!
05-10-2005, 12:04 AM
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Oil Pressure getting worse on LS6 pump! I already have a K&N filter with Amsoil synthetic running right now [been about 3 k miles now.. ] This was done when I had the cam installed [along with a LS6 oil pump]
The oil pressure was great [ cold starts 70+ psi ; hot idle 45-50 psi ; WOT 70 psi ; cruise 50 psi ]
However, as the weather started warming up, the oil pressure has been steadily declining... and now it's 45 psi at cold start, 35 psi at hot idle, 40-45 psi at WOT, and ~ 38-40 psi at cruise
]
Also, if it's 70+ outside and I'm driving with the AC on, the car heats upto 210*
I'm totally flustered at what went wrong!!
Mods in signature...
Any ideas ??
The oil pressure was great [ cold starts 70+ psi ; hot idle 45-50 psi ; WOT 70 psi ; cruise 50 psi ]
However, as the weather started warming up, the oil pressure has been steadily declining... and now it's 45 psi at cold start, 35 psi at hot idle, 40-45 psi at WOT, and ~ 38-40 psi at cruise
] Also, if it's 70+ outside and I'm driving with the AC on, the car heats upto 210*
I'm totally flustered at what went wrong!!
Mods in signature...
Any ideas ??
05-10-2005, 12:15 AM
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Do you have the fans set to come on earlier? Even with a 160 degree stat you will see temps up to 210-215* in warm weather because the fans aren't on yet. 40-45 psi at WOT? LIke 40-45 psi at 6k at WOT?
05-10-2005, 01:10 AM
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Originally Posted by blkZ28spt
Do you have the fans set to come on earlier? Even with a 160 degree stat you will see temps up to 210-215* in warm weather because the fans aren't on yet. 40-45 psi at WOT? LIke 40-45 psi at 6k at WOT?
yes the first fan is set to turn on at 168* and the second one at 175* [if I recall correctly]
And yes, 40-45 psi at 6k WOT once the car has been running for a while [30 mins or so normal driving]
05-12-2005, 10:56 PM
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Originally Posted by 1999T/A
I had the same problem with a rebuilt motor , turned out it was my sending unit the whole time . I just replaced it after putting around 5K miles on my new motor .
I bought a replacement sending unit too..
However, changed the oil today and the pressure has been normal [70+ psi at WOT ; 40 psi at idle and 50 ish at cruise below or around 3k rpms]
Here's what I found really strange... the used oil was really diluted
almost watery!.. it was Amsoil Synthetic... Switched to Mobil 1 5w30 today... Doing the Sending Unit anyways... hopefully, it'll be okay!!
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05-12-2005, 11:11 PM
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Originally Posted by cyphur_traq
was it really watery or was it mixed with coolant? there is a BIG difference!! coolant leaks are baaaaad................
Also, the car would heat upto 210* even with the fan mod [ 168* fan 1 : 172* fan 2 ] and 160*.. but the coolant was right on level ... But that probably warrants a minor tune adjustment because the car was last dyno-tuned around Feb when temps were still way below 0* here..
05-13-2005, 07:27 AM
#10
Make sure the oil doesn't smell like gas , if it does , your washing the rings down and could end up scoring a cylinder wall . It should be a pretty noticeable gas smell . Other than that , it could have just been that ya needed an oil change . I see my pressure decrease a tiny amt as the oil wears out . Jumps back up once I change it . How big of a jump in psi was it ?
