Oil pressure too high... Engine shut off on me once

[dchapma1957]

Starting a new discussion on my 5.7L as the original misfire, lifter, cam issue has been resolved.

I used the new Melling M452HV oil pump and according to the instructions left the stock pressure relief spring in the pump and tossed the Hellcat spring in the garbage. This stock spring is supposed to open the bypass at 65 PSI I believe so the engine doesn't freak out.

I am also using Mobil1 5W-30 oil (this may be the issue with this HV pump).

Took it for a short drive today, got about 1 mile from home and the engine simply shut off, Check Engine light and the red Oil warning light flashing. Pulled it over, grabbed my ODBC reader and looked for any codes - none found. Stied to start it and initially it wouldn't even crank, then it would crank for about 2 seconds and quit.

Looked again for codes, found none. A few minutes passed and then it started right up and I drove around for 15 - 20 minutes monitoring the oil pressure.

At idel, fully warm, in drive at a stop light I am getting 45 Lbs of oil pressure. That ramps up to 68 - 70 Lbs as soon as I start driving, and if I accelerate hard I saw it hit 80!

My guess is this morning the motor was not fully warmed up and the pressure exceeded some limit in the ECM so it shut the engine down.

Looking for opinions. I could change the oil and go back to 5W-20, but that stuff is like water, but maybe with this HV pump it would be OK.

OR

I put in a voltage divider circuit and trick the ECM to think the pressure isn't as high as it really is.

Opinions Please.

 

[Ken226]

Since 5w20 is the OEM oil, I don't think it'll hurt to try it.

The smaller diameter oil filters tend to result in lower oil pressure as well.

It's worth a shot. Easier than stripping it apart and putting a standard OEM oil pump back in.

My truck is 30 hot idle and 65-70psi at highway speeds using 5w20 and the large diameter Mopar filter. My engine is bone stock, never been opened up, with 90,000 miles.

With the small diameter Mopar filter I get 25 hot idle, and 55ish at highway speeds.

 

[dchapma1957]

Thats what I am thinking. I am n ot pulling this back apart! I have some running around to do tomorrow, I'll stop in at Take 5 and get an oil change using Mobile1 5W-20. I wonder if they will use a Mobile 1 filter if I give it to them?

I am just sick of working on it and don't even feel like changing the oil myself!

 

[dchapma1957]

Since 5w20 is the OEM oil, I don't think it'll hurt to try it.

The smaller diameter oil filters tend to result in lower oil pressure as well.

It's worth a shot. Easier than stripping it apart and putting a standard OEM oil pump back in.

My truck is 30 hot idle and 65-70 at highway speeds using 5w20 and the large diameter Mopar filter. My engine is bone stock, never been opened up, with 90,000 miles.

With the small diameter Mopar filter I get 25 hot idle, and 55ish at highway speeds.

Why does Mopar have 2 different filters. Do you have th epart number of the large diameter?

Thanks

 

[JHoward]

When the RAM trucks went the electric power assisted steering(~2013), the oil filter went smaller to accommodate the lesser space.

The smaller oil filter is MOPAR MO339.

The larger oil filter(MOPAR MO899)from the previous years, before 2013, will fit on the later 2013 model year HEMI's. It's an tighter fit, but can be wrangled up into place.

 

[Wild one]

Thats what I am thinking. I am n ot pulling this back apart! I have some running around to do tomorrow, I'll stop in at Take 5 and get an oil change using Mobile1 5W-20. I wonder if they will use a Mobile 1 filter if I give it to them?

I am just sick of working on it and don't even feel like changing the oil myself!

You could try swapping in a Hellcat oil pressure sender.I'd do that before i quit using 5W-30,but that's only my opinion.
Last time i checked the Melling pump comes with a high pressure spring,you have to swap in the lower pressure spring,and if you're seeing 80 psi,you definitely don't have the 60 psi spring installed

 

[dchapma1957]

You could try swapping in a Hellcat oil pressure sender.I'd do that before i quit using 5W-30,but that's only my opinion.
Last time i checked the Melling pump comes with a high pressure spring,you have to swap in the lower pressure spring,and if you're seeing 80 psi,you definitely don't have the 60 psi spring installed

That is strange because the instructions that came with the pump said the standard (Blue) spring was installed and if you wanted the higher pressure you should swap in the White spring. I did not swap the spring but it sure sounds like that is the case.

 

[Wild one]

That is strange because the instructions that came with the pump said the standard (Blue) spring was installed and if you wanted the higher pressure you should swap in the White spring. I did not swap the spring but it sure sounds like that is the case.

My understanding is they're shipped with the high pressure spring installed,and the other spring that you have to install yourself is the low pressure spring

 

[crackerjack1957]

My understanding is they're shipped with the high pressure spring installed,and the other spring that you have to install yourself is the low pressure spring

Right as usual Rick.........

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[Wild one]

Right as usual Rick.........

View attachment 551942

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I've never been able to convince the wife i'm right CJ. On a cloudless day,i could tell her the sky is blue,and i'd still be wrong

 

[dchapma1957]

Right as usual Rick.........

View attachment 551942

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That is not the pump I used. The part number was M452HV, not 10452HV. The instruction sheet that came with the pump clearly stated is was standard pressure and alternate WHITE spring was increased pressure.

Oh well, I am not taking it apart again and I do want to run 5W-30, so I am going to adjust the voltage going to the ECM by 12% as this pump is 12% higher in volume. As long as I get it into a range that satisfies the ECM it shouldn't be an issue. Even the information listed below from the Melling website is wrong as it does not mention the white spring.

 

[Wild one]

That is not the pump I used. The part number was M452HV, not 10452HV. The instruction sheet that came with the pump clearly stated is was standard pressure and alternate WHITE spring was increased pressure.

Oh well, I am not taking it apart again and I do want to run 5W-30, so I am going to adjust the voltage going to the ECM by 12% as this pump is 12% higher in volume. As long as I get it into a range that satisfies the ECM it shouldn't be an issue. Even the information listed below from the Melling website is wrong as it does not mention the white spring.View attachment 551945

By the sounds of this video that pump is a stock replacement pump for the Hellcat,so it'll have a high pressure spring in it right from word go,and the White spring would up the pressure for a Hellcat,and would blow the pressure through the roof if you used the optional White spring on a 5.7. How did you end up picking that pump instead of the 10452 pump which is the pump most guys are using with the lower pressure spring. In your case,you probably should have reused your original bypass spring from your stock pump.
Supposedly guys have had decent luck using the Hellcat oil pressure sender to combat the oil pressure code,that'd be easier then trying to reduce the voltage using resistors as Sky/Reignited suggests

Chrysler 5.7L & 6.4L HEMI High Volume Oil Pump from Melling Part #M452HV

In this video, Melling Technical Director Cale talks about the NEW Melling M452HV oil pump for Chrysler 5.7L & 6.4L HEMI engines!If you have tech questions ...

www.youtube.com

 

[Sillygoose]

i run the hellcat pump with whatever spring comes in it and see the same pressures you mention with no issue thus far - my guess is pressure wasn't your issue.

 

[Sherman Bird]

Thats what I am thinking. I am n ot pulling this back apart! I have some running around to do tomorrow, I'll stop in at Take 5 and get an oil change using Mobile1 5W-20. I wonder if they will use a Mobile 1 filter if I give it to them?

I am just sick of working on it and don't even feel like changing the oil myself!

You'll ACTUALLY go to "Take 5"?? They have been absolutely dismal, for my customers! I see loose/leaky oil filters and stripped drain plugs ALL THE TIME, overfill, underfill in my customers' vehicles who jump over a dollar to pick up a penny, instead of paying my higher price and quality for an oil change! They use sub par oil filters as well.

Years ago, the chain of oil service shops called "Jiffy Lube" kept me busy when I was a dealer (GM) automatic transmission technician. Their undertrained personnel would break off the neck of transmission filters on GM vehicles, then shove the new filter up into the bore. This would shatter the remaining broken off piece which would then be circulated into the pump/ valve body of the transmission, causing catastrophic damage!

 

[dchapma1957]

By the sounds of this video that pump is a stock replacement pump for the Hellcat,so it'll have a high pressure spring in it right from word go,and the White spring would up the pressure for a Hellcat,and would blow the pressure through the roof if you used the optional White spring on a 5.7. How did you end up picking that pump instead of the 10452 pump which is the pump most guys are using with the lower pressure spring. In your case,you probably should have reused your original bypass spring from your stock pump.
Supposedly guys have had decent luck using the Hellcat oil pressure sender to combat the oil pressure code,that'd be easier then trying to reduce the voltage using resistors as Sky/Reignited suggests

Chrysler 5.7L & 6.4L HEMI High Volume Oil Pump from Melling Part #M452HV

In this video, Melling Technical Director Cale talks about the NEW Melling M452HV oil pump for Chrysler 5.7L & 6.4L HEMI engines!If you have tech questions ...

www.youtube.com

Inexperience and rushing my research - that is how I settled on this pump. I can try the Hellcat sender - easy enough to swap out. I am not opposed to the resistors either - I have them on hand and could rig that up pretty quickly.
The instructions that came with it are below and do indicate that it has a 65 PSI spring in it. But I am way over 65PSI - it hit 80 yesterday on a good acceleration.

I do appreciate all the comments and information. Not sure which direction I will go yet. I'll keep the group posted as this information may help someone in the future.



These instructions lead me to believe it would top out at 65 PSI.

 

[dchapma1957]

You'll ACTUALLY go to "Take 5"?? They have been absolutely dismal, for my customers! I see loose/leaky oil filters and stripped drain plugs ALL THE TIME, overfill, underfill in my customers' vehicles who jump over a dollar to pick up a penny, instead of paying my higher price and quality for an oil change! They use sub par oil filters as well.

Years ago, the chain of oil service shops called "Jiffy Lube" kept me busy when I was a dealer (GM) automatic transmission technician. Their undertrained personnel would break off the neck of transmission filters on GM vehicles, then shove the new filter up into the bore. This would shatter the remaining broken off piece which would then be circulated into the pump/ valve body of the transmission, causing catastrophic damage!

I have never gone there in the past, I am just simply sick of working on this stupid truck!. My dealer gave me free oil changes for life so I have been taking it there since I bought it, but they will put in the crappy 5W-20 and Mopar filter, so I hesitate to take it back there.

The alternative is I do my own changes, which is a PITA. At 67, pushing 68 I just don't want to work on cars anymore!

 

[dchapma1957]

i run the hellcat pump with whatever spring comes in it and see the same pressures you mention with no issue thus far - my guess is pressure wasn't your issue.

Thanks. That has me guessing. It simply just quit on me with no codes stored. It started right back up after a minute and I drove it around for 20 more minutes. Hmmmmm

 

[Sherman Bird]

I have never gone there in the past, I am just simply sick of working on this stupid truck!. My dealer gave me free oil changes for life so I have been taking it there since I bought it, but they will put in the crappy 5W-20 and Mopar filter, so I hesitate to take it back there.

The alternative is I do my own changes, which is a PITA. At 67, pushing 68 I just don't want to work on cars anymore!

Yup! I'm pushing 70, myself. It hurts to work on cars, but I still do it!

I'd recommend that you find a small mom and pop repair shop who cares about doing your repair work and have them do the things you don't want or can't do. I've had to curb a few things, so I understand.

But the chain places hire undesirable and usually undertrained people to staff their shops.

 

[DILLIGAF]

At 67, pushing 68 I just don't want to work on cars anymore!

Thats why im currently training my daughter And she owns this massive POS , so she's getting quite the education... Always something to do on an Ecotick.


Wife isnt bad as well, got her to change her own front seals on the JK


Im sure glad my dad raised me right . I cant imagine paying to get all that done.

 

[Scottly]

I'm just not sure I ever heard of an ECM shutting down a motor because pressure is too high.