Low/Sporadic Oil Pressure and Clicking/Tapping/Knocking

[Mondo]

Just changed the head gasket and am having an oil pressure issue which is leading to a knocking.

After sitting off for an hour or more, the engine knocks for a second at start up and the oil pressure goes to around 40 during the idle. After i take it out onto the road, Pressure lowers to about 15~ at idle(Whatever that next mark under 40 is) and 40 during driving. During this entire time, the motor is making a sound

Could this be the Oil Pump, or the sender? The clicking sounds like it could be coming from the bottom end. Could this be a bearing going out?

Is the sound associated with this?

Video: http://s33.photobucket.com/albums/d61/fiercemortal131/?action=view&current=MOV01368.flv

 

[dumbo]

If the pressure goes down while driving...that is bad.
If you allready hear knocking,(and not the valves ticking/clicking) its bad, and too late.
You let your car sit and idle for over an hour?

 

[Mondo]

If the pressure goes down while driving...that is bad.
If you allready hear knocking,(and not the valves ticking/clicking) its bad, and too late.
You let your car sit and idle for over an hour?

Knocking is the wrong word. Its ticking/clicking.

Idleing, as in stopsigns, lights, etc. while driving.

Only when i first start it after sitting do i have no clicking/tapping/w.e and good pressure. until i start driving.

 

[Mondo]

Knocking is the wrong word. Its ticking/clicking.

Idleing, as in stopsigns, lights, etc. while driving.

Only when i first start it after sitting do i have no clicking/tapping/w.e and good pressure. until i start driving.

Will get a video when i get off work.

 

[Island_Yota]

you changed the oil after you did the head gasket right? :aigo:

 

[Mondo]

you changed the oil after you did the head gasket right? :aigo:

Yes

Changing it again this Thursday to make sure all the bad stuff is out.

 

[Mondo]

Just saw how much of a PITA it is to take the oil pan off. Any idea what to check before i resort to doing that?

Read somewhere that it can also be cause by low clearances?

 

[benchwarmer]

Are you burning any oil or is the pressure just low? What was your pressure like before you did the head gasket job? Before pulling the pan off I would remove the upper timing cover and look down at the oil pump driveshaft. Make sure nothing happened to it when the belt was loose. Check your PVC hose for clogs while your at it, though I doubt that would cause this.

If you're already hearing knocking then you need to stop driving it right now. It will only knock for so long before you spin a bearing and then you're really screwed.

 

[Mondo]

No Oil burning. Oil is at the perfect level.

Where is the PVC hose located?

As for the knock, Knock is different than a tap or a click correct? Will get a video in about an hour and a half and post it for your thoughts

 

[benchwarmer]

The PVC hose is the big L-shaped hose that goes from the block the head on the front driver side, right behind the alternator.

Ticking is a high pitched, high speed sound from the head caused by worn valve shims. Knocking is a deeper, slower sound most noticeable around 3000 RPM caused by worn rod bearings. It sounds like someone tapping the engine with a mallet.

If you have a stethoscope or length of tubing trying listening around while it's idling to pinpoint the sound.

 

[Mondo]

Does it go into the head or into the right valve cover?

Went to get lunch today and it seemed to stay at the right pressure longer...but the "sound" is still there.

 

[Mondo]

Heres the vid.

Yes, i know i got an exhaust leak. You can hear the sound really good at the last rev.

and now for your viewing pleasure:
http://s33.photobucket.com/albums/d61/fiercemortal131/?action=view&current=MOV01368.flv

 

[D7MSupra]

Sounds like the valves. It would sound really bad when you let off the gas if it had a low end knock even tho it may be early stages. Change the oil as soon as possible and check to see if you have any metal shavings in the oil. I hear that exhaust leak which could mean you have a bad valve.

 

[Mondo]

Sounds like the valves. It would sound really bad when you let off the gas if it had a low end knock even tho it may be early stages. Change the oil as soon as possible and check to see if you have any metal shavings in the oil. I hear that exhaust leak which could mean you have a bad valve.

Leak is coming from the exhaust header and somewhere by the cat.

Atleast its not Lower end yet.

To get rid of that knock, does that mean new valves, lifters, springs? Or Could i get away with just new springs(assuming one is weak causing the lifter to tap)

 

[benchwarmer]

That sounds like rod knock to me. It's hard to tell from a video but between the sound and your oil pressure I think you've got a rebuild in your near future.

 

[Mondo]

That sounds like rod knock to me. It's hard to tell from a video but between the sound and your oil pressure I think you've got a rebuild in your near future.

Or just drive it till it goes boom.

Will it last me through winter you think? Drive like 100 miles a week.

Then prepare for the 1JZ or 2JZ....haven't decided.

 

[AJ'S 88NA]

If you did the HG because it blew and got coolant in the oil, most likely rod knock.

 

[benchwarmer]

Or just drive it till it goes boom.

Will it last me through winter you think? Drive like 100 miles a week.

Then prepare for the 1JZ or 2JZ....haven't decided.

Only one way to find out. I'd be surprised but you never know. look up staticpat's rod knock fix. You can replace bearings while the engine is still in the car if you're you're brave/foolish enough.That might be enough to hold you over.

 

[mkiiSupraMan18]

BoostLee's car did this for... about a year and the engine is STILL going. I just replaced the rods/mains in it (as it is the engine I'm swapping into my 82) and they were deff worn.

 

[Koenigturbo]

I.M.O. (only) Sporadic oil pressure, maybe it's stuck check valve
B.T.W. I think that ticking sound is the valve's or exhaust leak, rods have a different tone.