Rb25 Oil Pressure Problem

[R 2 THE J]

Hi all,

I've had a small problem (well could be a big problem) since the last two weeks have past. When I start my car up there is a CHH CHH CHH sound coming from the motor, i thought ok, maybe it'll just go away but it hasn't.

Not only that, after I start my car my oil pressure is off the roof but once it warms up it drops down, although when i'm driving it sometimes tends to rise whenever i give the throttle a hit.

-Does anybody have any idea whats going on?

-Anything I should check so I can give u guys a more i depth visual imagery of whats happening?

I'm bout to give it a major service soon before i start doing more mods! Just wanna know what i'm in for!

I'm open to all suggestions....thanks in advance!

[r33cruiser]

oil pres is going to be high when first started of cold, and will be lower when it warms and thins out...basic physics.

increase in pressure when accellerating is perfectly normal too.

[Duncan]

what you describe is normal - I hate to think what it was doing before!

[R 2 THE J]

what you describe is normal - I hate to think what it was doing before!

oh ok...

when i start my car oil pressure rises right to the top of the gauge, and then drops down to the middle...(sorry dunno what the measurement is).When i accelerate it continues to slimb back up again every gear. for eg. 1st gear it rises then when i change it drops back down, then 2nd it rises again. When this happens i feel a power drop.

I've also noticed that when my oil pressure stays @ the same pressure throughout the gears my power doesnt drop.

I use turbolight 10W40 oil which is very good fully synthetic.

Also, whats that CHH CHH CHH sound @ start up??.Its embarrassing when i start my car up.

Thanks for all those that have replied!

[Yawn]

What Chh Chh CHH? Like air leaking or the starter motor?

[jarrod83]

i have the same problem.. except id describe it more as a course grinding noise for the first few secs then it goes away.. and my oil always sits on 8 now n sometimes drops down to 6 whilst cruising.. when the car was healthy it always use to sit on 4... i had a leak down test n found out i have a slightly busted ring on cylinder 6.. could this be related to the problem?

If yous find a solution to this problem let me know i havent had it lookd at yet as my cars been having other problems of running rich one minute then stupidly lean the next

out of curiousity how long does your chh chh sound last??!

[R 2 THE J]

i have the same problem.. except id describe it more as a course grinding noise for the first few secs then it goes away.. and my oil always sits on 8 now n sometimes drops down to 6 whilst cruising.. when the car was healthy it always use to sit on 4... i had a leak down test n found out i have a slightly busted ring on cylinder 6.. could this be related to the problem?

If yous find a solution to this problem let me know i havent had it lookd at yet as my cars been having other problems of running rich one minute then stupidly lean the next

out of curiousity how long does your chh chh sound last??!

hmmmm..na its not air leaking...might be the starter motor.

when my car is warm it doesnt make the noise as long, maybe 1 second, but when its cold around 2.5 sec. wierd

yeh same..when my car was healthy it satayed at 4 but on highways around 6

its at 8 every time now at start up, im just very woried if im doing dammage to my engine.

its not a bov sound...cant really describe it...

[T04GTR]

you cant rely on the standard gauge!! its not accurate.

what your describing is lifter noise. why its noisy could be the not so good oil you are using. or there is excessive sludge in the oil galleries in the head. something has blocked their oil supply.

ps jarrod83, your problem is bits of piston (melted aluminium) blocking the tiny little oil holes and valves in the lifters, or the check valve in the head is blocked and the head is starved of oil.

have a mechanic install a good quality oil pressure gauge. and go from there.

[Devils_Advocate21]

I was going to suggest get some engine flush, then change the oil and filter to atleast good brands, ie: Motul then start it and see how it goes, then move on to the next, if your really worried you could do comp and leakdown tests to see any underlying issues after oil change.

Curious what happened prior the last two weeks or has it been long term issue. As well as when was the last service done KM'S as well as what oil's were used last time.

Cheers