Slight Knocking noise after oil change?

[Hmong_1G]

Ok I hope it's nothing serious, but my passed down supra ( from my dad) has been on conventional Castrol 10w30 as long as my dad had owned it. He rarely does oil changes on time. I just changed it out For Royal Purple and after starting it up... it idled and ran fine. After it reached its operating temp, I can hear a knocking noise from under the Intake manifold. WTF? Is this because the use of synthetics or a more horrible reason. This noise gets alittle louder, but not much with revs. Oil pressure does go down at normal temps. Is this a normal 7mgte noise? I've searched around and looked at many other posts.... but I really hope its normal. Please someone enlighten me.


sorry for the rather longish post.

 

[hvyman]

syn is not going to affect it. wat rp did you use 5w30 or 10w30? either way there all still a 30w at op temps. sure you just dont have something loose down there? what is your oil pressure at idle and at 3000rpms hot? where exactly is the noise oming from front rear? need some more info.

 

[zachm611]

valve train is pretty noisey as it is maybe you need to do an adjustment?

 

[GC89]

How loud of a noise are we talking and what happens if you hold the rps at 2k?

 

[Hmong_1G]

Don't flame me but I'm doing my measurements of the stock gauge. I know its not as accurate, but at 3k the psi jumps up to wat I believe is 15-20 mark. Its hard to tell you all, but I think oil pressure is fine, but this knock seems right under the intake manifold. I thought 7mgte is a hydraulic valvetrain? I'm running 10w30 RP. At 3k the noise is a little more faint but there. It's weird because this noise becomes noticeable at normal operating temp. On start ups (cold) the knock isn't there. Thanks guys for the fast responses.

 

[mk3tattoos]

would a safc2 show you the knock? or is the knock sensor no good on the safc2

 

[gaboonviper85]

Don't flame me but I'm doing my measurements of the stock gauge. I know its not as accurate, but at 3k the psi jumps up to wat I believe is 15-20 mark. Its hard to tell you all, but I think oil pressure is fine, but this knock seems right under the intake manifold. I thought 7mgte is a hydraulic valvetrain? I'm running 10w30 RP. At 3k the noise is a little more faint but there. It's weird because this noise becomes noticeable at normal operating temp. On start ups (cold) the knock isn't there. Thanks guys for the fast responses.

no a 7m does not have lifters...we have shim buckets which suck royal ass and valve adjustments are a whore!

also....10w30 royal purple is too thick on cold start ups.....you really should have went with 0-30....

 

[NewWestSupras]

Try a mech stethoscope, and try to determine if it's coming from the bottom or top...I'd check the crank damper torque, too. gl.

 

[teebone]

What injectors are you running? Some injectors make alot of noise!

 

[TooGoode]

^they might click but they don't knock...

 

[GC89]

I would also recommend a different oil 5 or 0-30, preferably 0. Try crawling under the car when it is running see if that gives you a better Idea if its coming from the pan or something else.

 

[Hmong_1G]

Alright guys... thanks for the advices. I haven't got a sethoscope avalible, but will check into it sooner. I checked the crank and seems on tight and perfect condition. I'm still on the stock injectors. Funny thing is this happen after I did the oil change. WEIRD.... :aigo:LOL.


My next oil change i'll go 5w-30. This 7mgte is still all original with 178,xxx miles. :biglaugh: