Factory oil pressure gauge acting all funny!!!
07-25-2007, 01:48 PM
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Factory oil pressure gauge acting all funny!!! oil pressure is good it just bounces all over the place and gets stuck every now and then any ideas??
07-25-2007, 02:36 PM
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My oil pump went south (99 SS) a few years ago and the guage acted this way - so beware.
You can replace the sensor/presure sending unit, but I would watch this like a hawk.
You can take the oil filler cap off during idle to confirm oil is being pumped to the rockers, I suppose.
This would make me nervous. ...any metal shavings in the oil?
You can replace the sensor/presure sending unit, but I would watch this like a hawk.
You can take the oil filler cap off during idle to confirm oil is being pumped to the rockers, I suppose.
This would make me nervous. ...any metal shavings in the oil?
07-25-2007, 02:53 PM
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its not that its getting low never below 40psi in heat! its just if i get on it the pressure goes up like it should and when it should go down after i let of it sticks! Or if i rev it it goes all over the place like it gauge is bad or somthing
About to change oil now
About to change oil now
07-25-2007, 03:36 PM
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**** i hope thats not it because I'm about to go on a Road trip from KC mo area to Home town Pensacola Florida will be putting about 2,000miles on car round trip! I hope thats not it! It has been doing it for about 2 months or more
Just changed oil not metal at on on drain plug
Just changed oil not metal at on on drain plug
Last edited by SIC LSX; 07-25-2007 at 03:45 PM.
07-25-2007, 03:56 PM
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Changing the oil pump is a PITA.
Pull the raditor, hoses, belts, and crank pulley bolt and crank pulley. Pull the timing cover, timing chain, loosen the oil pan, and finally get the pump and disconnect pickup tube. Replace the pump and use a new oil pickup tube O-ring and a new TTY crank bolt. Replace all the junk you just removed in reverse order.
Uhg! I don't ever want to change that *&^% again!
Pull the raditor, hoses, belts, and crank pulley bolt and crank pulley. Pull the timing cover, timing chain, loosen the oil pan, and finally get the pump and disconnect pickup tube. Replace the pump and use a new oil pickup tube O-ring and a new TTY crank bolt. Replace all the junk you just removed in reverse order.
Uhg! I don't ever want to change that *&^% again!
07-25-2007, 04:01 PM
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yeah i know what to do i just dont want to do it LOL I have been also hearing about the factory gauge clusters going bad! Ill hook up a aftermarket gauge b4 i do all that LOL
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07-25-2007, 04:06 PM
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GM had many failures on 98/99 LS1 cars. To me, it is amazing that they avoided a manditory recall for faulty oil pumps.
I called the dealer who told me to run the engine with no presure since GM would likely buy me a new engine! Right!
I called the dealer who told me to run the engine with no presure since GM would likely buy me a new engine! Right!
07-25-2007, 04:17 PM
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I can't remember why these pumps went bad but the pump gears were not the issue. I think it might have been faulty springs inside the pump that govern the pressure, however.
You could use an external pressure guage to confirm pressure but that will not give you any assurance that the spring in the pump might malfunction at any time in the future and shut off oil completely.
I think the pressure unit (brass) is on the driver's head near the 1st plug.
You could use an external pressure guage to confirm pressure but that will not give you any assurance that the spring in the pump might malfunction at any time in the future and shut off oil completely.
I think the pressure unit (brass) is on the driver's head near the 1st plug.
07-25-2007, 04:19 PM
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07-25-2007, 04:35 PM
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also just had someone pm me this
Hey, I have the same problem as you. I have a 99 T/A and my gauge does the exact same thing. I seriously doubt it's your oil pump because mine was doing it before I swapped a cam in(new ported ls6 pump) and is still doing the same thing. Most likely it's your oil pressure sending unit. Let me know how things work out for you.
Hey, I have the same problem as you. I have a 99 T/A and my gauge does the exact same thing. I seriously doubt it's your oil pump because mine was doing it before I swapped a cam in(new ported ls6 pump) and is still doing the same thing. Most likely it's your oil pressure sending unit. Let me know how things work out for you.
07-25-2007, 04:59 PM
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Well did the oil change and went from M1 0w-40 to M1 5w-30 man the oil pressure is up more! was around 70psi for a while then dove it around in 95 deg heat and never got below 45 psi1 but still bounces around like it sticking when i let off!
One more question when i turn the car off the oil pressure gauge sticks at 40psi then you turn the key and it drops down to 0 then when it cranks it goes where it should! Is that noramal?
One more question when i turn the car off the oil pressure gauge sticks at 40psi then you turn the key and it drops down to 0 then when it cranks it goes where it should! Is that noramal?
07-25-2007, 05:02 PM
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hey man mine did that **** and a few months later i spun a rod bearing because the oil pump went out i had to get new rods new pistons and all that other good **** that goes in ther basically it fucked my motor so yeah if i was u i would have that oil pump changed i dont think it costs nearly as much as a new motor lol
07-26-2007, 09:25 PM
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well i noticed something! Ok i turned my car off and back to the on position with the car not running with power to the gauges and it was still acting funny??
07-26-2007, 11:15 PM
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Take the manifold off and replace the sending unit. I think it was like 35 bucks. I joined the broken oil sending unit club on my ls6 intake swap. The damn brake booster line got caught and broke it. On the bright side I added oil pressure by switching sendin units 
