oil pressure bouncing
Thread Starter
On The Tree
Joined: Apr 2011
Posts: 142
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From: Houston/ Kingsville,Tx
oil pressure bouncing 01 m6 stock internals ls1
today when i was pulling out of first gear i noticed my oil pressure dropped a tad bit under half way and started pulsating like it was about to stall but when i accelerate i jumps back up to 3/4s of the way up (all this was while the engine was a normal OT).... does this mean new oil pump???
today when i was pulling out of first gear i noticed my oil pressure dropped a tad bit under half way and started pulsating like it was about to stall but when i accelerate i jumps back up to 3/4s of the way up (all this was while the engine was a normal OT).... does this mean new oil pump???
True but in our case it's not a fluctuation (with idle), it's a bouncing of the needle at idle (in my case and assuming in his at steady idle). I know what the guy means mine does it too. It's more like a flicker, the guage will bounce and jerk a little when it gets down just a bit under 40 PSI, and it does it in a roughly 5 PSI range. Anything above 40 PSI it stays constant like it should.
And after typing that I kinda had a duh moment, it would seem logical that it is the sensor or guage and not an actual engine issue considering we have the same issue and the pressure is steady everywhere else. For me it seemed it obvious it was my sending unit since it started immediately after I changed it out.
FWIW, mine has been doing it for like 2 years, and I haven't had any problems at all. It's just annoying.
Oh and Alex2210 mine also only does it once it's fully warmed up, never during warm up. At cold idle the pressure is rock steady.
And after typing that I kinda had a duh moment, it would seem logical that it is the sensor or guage and not an actual engine issue considering we have the same issue and the pressure is steady everywhere else. For me it seemed it obvious it was my sending unit since it started immediately after I changed it out.
FWIW, mine has been doing it for like 2 years, and I haven't had any problems at all. It's just annoying.
Oh and Alex2210 mine also only does it once it's fully warmed up, never during warm up. At cold idle the pressure is rock steady.
Found more threads, same ****. And yet no answer.
https://ls1tech.com/forums/generatio...-oil-pump.html
https://ls1tech.com/forums/generatio...-oil-pump.html
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put a mechanical oil pressure gauge on your car....
it will tell you if its the sensor or something else...
if the pressure tests fine with a mechanical gauge, then you know its a bad sensor or an issue with the cluster...
$10 for the special sensor socket at O'Rileys, the sensor is $40 for the AC Delco one
about an hour worth of time to get stuff out of the way good enough to get at it easier.
if the sensor doesnt fix it, then you know its a gauge cluster issue...which is all of 6 small bolts all 7mm or phillips to be able to swap it out with a known good one from a buddy to test it..
if its mechanical...
it could be a pump going bad, or the little relief spring going bad
it could be the o-ring going bad, or even something like the pickup tube is partially clogged...
but mechanical means you have to get in the motor to solve it...and if you are going in, you might as well replace that stock pump with a ported one and you have to put a new o-ring in at the same time.
it will tell you if its the sensor or something else...
if the pressure tests fine with a mechanical gauge, then you know its a bad sensor or an issue with the cluster...
$10 for the special sensor socket at O'Rileys, the sensor is $40 for the AC Delco one
about an hour worth of time to get stuff out of the way good enough to get at it easier.
if the sensor doesnt fix it, then you know its a gauge cluster issue...which is all of 6 small bolts all 7mm or phillips to be able to swap it out with a known good one from a buddy to test it..
if its mechanical...
it could be a pump going bad, or the little relief spring going bad
it could be the o-ring going bad, or even something like the pickup tube is partially clogged...
but mechanical means you have to get in the motor to solve it...and if you are going in, you might as well replace that stock pump with a ported one and you have to put a new o-ring in at the same time.
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Found more threads, same ****. And yet no answer.
https://ls1tech.com/forums/generatio...-oil-pump.html
https://ls1tech.com/forums/generatio...-oil-pump.html
I've seen that issue before, let me ask you this: when you start the car after it's been sitting for, say, 30+ minutes, does it take just a second or two to establish oil pressure at the gauge? Or is oil pressure always instant upon start up? On the car that I saw had the flicking needle, it also took a couple seconds to establish oil pressure on start up. Not the case with my cars, they had instant pressure readings...
when the needle is bouncing... check system voltage at the battery...
if its bouncing too... theres your issue...then its most likely an alternator issue...
Trust me, it's not that. I have tested my voltage a billion times. Check out my 30 page alternator thread lol.
