SiriusBlack Posted March 21, 2022 Share Posted March 21, 2022 Hey all. I recently did the first oil change on my new to me 05 STI. It did alright during the circulation after the change, but my low oil pressure light came on on my way home from work. From what posts I can find, I'm guessing a piece of sludge or carbon got dislodged and jammed the pressure relief valve open. I believe that valve is on the oil pump itself? Can anyone confirm that? If it is, how easy would it be to correct? Can I replace that valve, or does it have to be the whole pump? I'm currently in the process of installing an oil pressure gauge, so I can verify what pressure is actually there. Also, I can't think of why it would, but could this have been caused in any way by the fact that I changed it from 5W30 to 5W40 during the change? Thanks in advance. Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted March 21, 2022 Share Posted March 21, 2022 GD or Ido or others will have best troubleshooting approach but, don't discount the possibility of oil pick-up tube failure. Not unknown and some folks upgrade to Killer B for that reason. Quote Link to comment Share on other sites More sharing options...
SiriusBlack Posted March 21, 2022 Author Share Posted March 21, 2022 First thing I checked was the pickup. It was fine, but I replaced it with a new killer bee while I was in there anyway. 1 Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted March 22, 2022 Share Posted March 22, 2022 Any metal evident in the pan? GD Quote Link to comment Share on other sites More sharing options...
SiriusBlack Posted March 22, 2022 Author Share Posted March 22, 2022 None. No sludge either, it was surprisingly clean. Quote Link to comment Share on other sites More sharing options...
forester2002s Posted March 22, 2022 Share Posted March 22, 2022 Perhaps there's nothing wrong with the oil pump. Could this just be a failure of the oil-pressure switch? Quote Link to comment Share on other sites More sharing options...
SiriusBlack Posted March 22, 2022 Author Share Posted March 22, 2022 It's possible. I'll let you know on that once I get the gauge installed. Quote Link to comment Share on other sites More sharing options...
rverdoold Posted March 26, 2022 Share Posted March 26, 2022 The switch is a membrane type on the top of the block. It uses the block as a ground and 1-wire for the indicator in the dash. (the switch is somewhere under the alternator, next to the EJ25 logo cast. 25240KA040 could be the right one) - Check for leaks, and check oil level with the dipstick first! - Check if that wire/connector is connected. Or pull it off and ground it with a piece of electric wire. Start and see if the light goes off I have had these fail between 4 and 12 y of car age, the are simple to replace. 1 Quote Link to comment Share on other sites More sharing options...
SiriusBlack Posted March 27, 2022 Author Share Posted March 27, 2022 Checked all that. The oil level was perfect, no leaks. After the car was wrecked previously in it's life, and rebuilt. It had a 20,000 mile motor installed. I have a new dummy light sensor in case that is the issue, I thought the light typically flickered if the sensor went bad. On the trip home from work when the light came on, I drove it the rest of the way home (about 8 blocks) never letting the engine go above 2000 RPM. All I heard noise wise was a faint clicking that I think was lifter click, no other noises like rod knock. Quote Link to comment Share on other sites More sharing options...
GeneralDisorder Posted March 27, 2022 Share Posted March 27, 2022 97+ engines are solid lifter so you did not hear a lifter tick. GD Quote Link to comment Share on other sites More sharing options...
SiriusBlack Posted April 2, 2022 Author Share Posted April 2, 2022 Got it all sorted out today. It was purely coincidence that the light went on after a change. The sensor was faulty. In the process of troubleshooting though, I now have a killer bee oil pickup and an oil gauge. Sadly, the gauge is a cheap digital one so not sure how accurate it is. It says I have 20psi at warm idle and about 90psi at 4000 rpm. What are the proper pressures for this car? Quote Link to comment Share on other sites More sharing options...
Nordmany Posted April 5, 2022 Share Posted April 5, 2022 On 4/3/2022 at 2:22 AM, SiriusBlack said: Got it all sorted out today. It was purely coincidence that the light went on after a change. The sensor was faulty. In the process of troubleshooting though, I now have a killer bee oil pickup and an oil gauge. Sadly, the gauge is a cheap digital one so not sure how accurate it is. It says I have 20psi at warm idle and about 90psi at 4000 rpm. What are the proper pressures for this car? Oil Pressure: 98 kPa (1.0 kgf/cm2, 14 psi) or more at 800 rpm 294 kPa (3.0 kgf/cm2, 43 psi) or more at 5,000 rpm 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.