Oil Pump failing?
01-02-2016, 03:06 AM
#22
Registered User
Update.
-Brought the car to a 28 year Nissan Vet. He's scratching his head
- His suggestions are PCV valve change , Engine Flush , Pressure relief valve in the oil pump.
- Replaced PCV Valve. No Change . No change in oil PSI
- Got an engine flush and oil change. No change in oil PSI
- For anyone interested. Engine RPM to PSI readings.
- idle 400~rpm 15psi~
- 1k 30 psi
- 1.5k 40 psi
- 2k 55 psi
- 2.5K 65 psi
- 3k 85 psi
- 3.5k 90~ psi
- 4 k 100 psi
- 4.5k 110psi
Manufacturer Spec idle 14 psi 2k rpm 43psi (min. , warm engine)
-Brought the car to a 28 year Nissan Vet. He's scratching his head
- His suggestions are PCV valve change , Engine Flush , Pressure relief valve in the oil pump.
- Replaced PCV Valve. No Change . No change in oil PSI
- Got an engine flush and oil change. No change in oil PSI
- For anyone interested. Engine RPM to PSI readings.
- idle 400~rpm 15psi~
- 1k 30 psi
- 1.5k 40 psi
- 2k 55 psi
- 2.5K 65 psi
- 3k 85 psi
- 3.5k 90~ psi
- 4 k 100 psi
- 4.5k 110psi
Manufacturer Spec idle 14 psi 2k rpm 43psi (min. , warm engine)
01-28-2016, 11:19 AM
#25
Super Moderator
MY350Z.COM
MY350Z.COM
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Update. Drove my 3500 mile road trip,observed a few things.
-Cold start up around 110psi - 40-50 outside temp
-Operating temp at 65-85mph 65psi
- Around 2,000 miles in I was getting more engine vibration/noise at idle.
-The main odd part of it was, I could start my drive and I would be at operating temp by the time i got on the highway, accelerate to 65 and lock cruise control . The oil PSI would be at 75~ . Then after 30 minutes or so go down to 65psi~ . Then I would bump it up to 80 and it would climb to 75~ psi again for 10 or so minutes then go down to 65 psi ~ . The only odd part was when id WOT in 6th gear going 80 the PSI would drop down to or below 60 for a brief moment the start building up. Anthing past 4k rpm would be past 90psi which the techs at nissan said dont go past. Modderate acceleration the PSI would needle would "wiggle" up and down in PSI on initial acceleration then smoothly build in PSI.
-Current action , drain oil and take a sample to send to a lab. Take off oil pan and inspect the oil pump pick up for build up and try to visually inspect the galleys. Will keep updated if anyone is interested.
-Nissan quote , $100 for inspection then further action up to me. Oil pump replacement at a shop $1,000+.
-Currently in VA beach if anyone local wants to help trouble shoot with me or give a second opinion in.
-Sorry if to some of you this seems like a non major issue but this is my first car i paid for out of 100% and i baby the thing so if something minor/major goes wrong i toss and turn in my sleep.
-Cold start up around 110psi - 40-50 outside temp
-Operating temp at 65-85mph 65psi
- Around 2,000 miles in I was getting more engine vibration/noise at idle.
-The main odd part of it was, I could start my drive and I would be at operating temp by the time i got on the highway, accelerate to 65 and lock cruise control . The oil PSI would be at 75~ . Then after 30 minutes or so go down to 65psi~ . Then I would bump it up to 80 and it would climb to 75~ psi again for 10 or so minutes then go down to 65 psi ~ . The only odd part was when id WOT in 6th gear going 80 the PSI would drop down to or below 60 for a brief moment the start building up. Anthing past 4k rpm would be past 90psi which the techs at nissan said dont go past. Modderate acceleration the PSI would needle would "wiggle" up and down in PSI on initial acceleration then smoothly build in PSI.
-Current action , drain oil and take a sample to send to a lab. Take off oil pan and inspect the oil pump pick up for build up and try to visually inspect the galleys. Will keep updated if anyone is interested.
-Nissan quote , $100 for inspection then further action up to me. Oil pump replacement at a shop $1,000+.
-Currently in VA beach if anyone local wants to help trouble shoot with me or give a second opinion in.
-Sorry if to some of you this seems like a non major issue but this is my first car i paid for out of 100% and i baby the thing so if something minor/major goes wrong i toss and turn in my sleep.
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terrasmak (01-29-2016)
01-28-2016, 01:17 PM
#27
Just a quick FYI, the needle showing proper water temp has a range from like 130 to 220 degrees and will have the same needle position. So you are hitting the highway with a warmed up car that is actually still cool. Oil temp is normally 20 degrees cooler than water under normal conditions , then 20 degrees hotter than water when the car is pushed hard after a few laps. Oil also takes longer to come up to temp as the car warms up. How do I know, I have an aftermarket oil temp gauge.
01-28-2016, 02:41 PM
#28
Registered User
03-29-2016, 09:45 PM
#30
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Took this video on my road trip home. Was a 9 hour drive and the oil pressure stayed this temp after 30 minutes of driving till the end. While at home dealership head mechanic said something is irregular with the oil pressure and best bet is the regulator valve. When i showed him this video he said it should be a little bit above 30 not 60.
Also SES light is due to Test Pipes . Even checked after codes still read for the cats.
Last edited by bhamham1; 03-29-2016 at 09:47 PM.
03-30-2016, 09:14 PM
#34
Dont want to clutter this post, will have update video when i start my work on replacing the PRV . Just need to find the part , if it doesn't change well I got some experince and new found knowledge .
P.S. bhamham1 is my old mobile account, accidentally logged in when submitting the video
P.S. bhamham1 is my old mobile account, accidentally logged in when submitting the video
04-02-2016, 03:57 PM
#35
New update,talking to a buddy and finding a good import engine shop near me that has cheap VQ35HR engines i decided that if need be might just buy a new engine a build the OEM. So i was cruising around and decided to WOT only watching oil psi. At 4500 rpm it hit 100~ psi and ever so slightly went up when i got to 6500. dcains you might be right with it being fine , still going to get it checked out because ive never seen it past 90 psi.
04-04-2016, 12:58 PM
#38
agree with dcains; lots of worrying over nothing. Even with the # of posts, very unclear what you have done to investigate. Did you try a lower weight oil? Did you try changing your oil filter - maybe the bypass on that is stuck? Did you ever record oil temperature (not coolant temp!) vs oil pressure? How do you know your gauge is accurate per post above? All of this changed suddenly after an oil change, right? Seems like you should be able to figure this out on your own...
I routinely have over 100 psi at start up and as the oil warms it will drop to 25-30 psi at 1000 rpms. I also run a 20W-50 oil as recommended by my engine builder for my bearing clearances. Every car is different.
I routinely have over 100 psi at start up and as the oil warms it will drop to 25-30 psi at 1000 rpms. I also run a 20W-50 oil as recommended by my engine builder for my bearing clearances. Every car is different.
Last edited by rcdash; 04-04-2016 at 01:06 PM.
04-04-2016, 10:36 PM
#40
agree with dcains; lots of worrying over nothing. Even with the # of posts, very unclear what you have done to investigate. Did you try a lower weight oil? Did you try changing your oil filter - maybe the bypass on that is stuck? Did you ever record oil temperature (not coolant temp!) vs oil pressure? How do you know your gauge is accurate per post above? All of this changed suddenly after an oil change, right? Seems like you should be able to figure this out on your own...
I routinely have over 100 psi at start up and as the oil warms it will drop to 25-30 psi at 1000 rpms. I also run a 20W-50 oil as recommended by my engine builder for my bearing clearances. Every car is different.
I routinely have over 100 psi at start up and as the oil warms it will drop to 25-30 psi at 1000 rpms. I also run a 20W-50 oil as recommended by my engine builder for my bearing clearances. Every car is different.
-I found a really nice shop near by who is going to check it out for me tomorrow if its good then getting a tune if not then repair .