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Jake
Jake, Nissan Technician
Category: Nissan
Satisfied Customers: 2489
Experience:  Experienced collision repair technician, Pulaski Tech graduate and DSM hobbyist.
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xterre: 2005 nissan xterra 4.0l 2wd. low oil pressure idle

Resolved Question:

2005 nissan xterra 4.0l 2wd. low oil pressure idle warm engine. remote mechanical quage showed 19 psi, raises w rpm. min spec, 14psi. no engine noise, didnt see any bearing in oil. do they have a pattern failure problem as it looks many people have same complaint. new sending unit, new oil/filter. oil pickup clear. 83000 miles
Submitted: 1 year ago.
Category: Nissan
Expert:  Jake replied 1 year ago.

DSMtuner :

Hi there, thanks for using Justanswer.

DSMtuner :

So oil pressure was 19psi when the engine was warm and idling?

DSMtuner :

are you still there?

DSMtuner :

Let me know when you return and we will continue. thanks

Customer:

im here, yes, 19psi warm idle, raises w rpm

DSMtuner :

Great, thanks

DSMtuner :

So what is your main concern and I will be glad to help.

Customer:

low oil pressure w warm engine at idle

Customer:

vehicle had fairly low miles

DSMtuner :

and your concern is that 19psi is too low?

Customer:

yes

DSMtuner :

is the oil light on when idling?

Customer:

customer has owned car for a while and just started experiencing problem

Customer:

no lite

DSMtuner :

Honestly, this is not really a cause for concern if it nots dropping dangerously low at idle. Like 5 psi

Customer:

vehicle did not use to do symptom...so something is different

DSMtuner :

If it was scary low at idle I would be concerned because usually when that happens on these engines, its because the inner timing cover seal is bad

Customer:

is there a check to confirn that diagnosis before just tearing into it?

Customer:

and the inner timing cover seal, where is located. do u mean the case cover gasket?

DSMtuner :

let me see if it shows it on the service manual brb

DSMtuner :

not really a chack for

DSMtuner :

classic symptoms for it are extremely low pressure at idle that jumps up upon acceleration and turns the light off

DSMtuner :

brb

DSMtuner :

This is the 4.0 right?

Customer:

yes

Customer:

2wd

DSMtuner :

of course the manual shows every o-ring behind the stinking cover, but not the gasket I am talking about.

DSMtuner :

when you remove the inner timing cover theres a steel cover piece on the right hand side when you purchase the entire cover

DSMtuner :

thats the one that causes the problem

Customer:

?

Customer:

so behind chains there is another cover that has to come off, is it available seperate or w whole cover only?

DSMtuner :

I was trying to explain the inner timing gasket that causes it.


 

DSMtuner :

it's part of the whole cover.


 


 

DSMtuner :

yes, it's part of the rear timing case

DSMtuner :

ALOT of work

Customer:

ok, how sure are you?

DSMtuner :

that's why i don't recommend it unless the pressure continues to drop dangerously low

DSMtuner :

i have seen 5 psi kind of pressures in most cases

Customer:

does that cause the pressure to bleed internally somewhere?

DSMtuner :

no, thats why it's so hard to detect

DSMtuner :

Your customer doesn't have any timing chain noise or issues do they?

Customer:

no noise or issues, if it is a gasket.seal gone/going bad....but doesnt bleed the pressure internally somewhere...why does it cause low oil pressure?

Customer:

just trying to understand

DSMtuner :

sorry got tied up I'm back.


 


 

DSMtuner :

i have only seen this twice, both times it was on the frontier same engine.

DSMtuner :

both times, the gasket bleeding out pressure would prevent it from adequetly holding pressure at idle only


 


 

Customer:

warm and cold or just war?

Customer:

warm?

DSMtuner :

Yes, pressures only got excessively low at warm operating temps

DSMtuner :

because the oil thins out some as it heats up, so generally pressures are higher when the engine is cold

DSMtuner :

i can't remember what pressure readings were with the engine cold though

DSMtuner :

but i clearly remember when warm they hovered around 5psi

DSMtuner :

the other one also fluctuated around 5-10 psi at idle

DSMtuner :

don't really see any issues with the pumps on these engines


especially with that mileage

DSMtuner :

if you need anything else just holler at me. Even if i am working on something It will send me an email on my phone and i can reply from my phone. thanks


 


 

Customer:

k thanks

Jake, Nissan Technician
Category: Nissan
Satisfied Customers: 2489
Experience: Experienced collision repair technician, Pulaski Tech graduate and DSM hobbyist.
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Jake
Jake
Nissan Mechanic
2489 Satisfied Customers
Experienced collision repair technician, Pulaski Tech graduate and DSM hobbyist.