If I come up to a stop light and sit there idling, my oil pressure gauge bounces a bit. Not much, but quite enough to watch it go up and down pretty fast. Oil pressure at start up/WOT/and idle is normal, except for this bouncing. Changed the oil to Mobile 1 early spring, after I did Seafoam on this car for probably the first time in it's life(bought it last year). Everything seems normal. The gauge bounces it seems when it is up to temp. Any ideas?
Thanks

 

Do your RPM's fluctuate at the same time?

 

It could be very bad like a spun bearing or it could be just a faulty sender unit.

 

Mine bounces too at times though. It doesnt bounce to zero and back but may 10psi or so.
Where did you pour in your seafoam at? Through the brake booster hose is where I done mine but I didnt get the white smoke out like I did on my Impala when I done it.

 

Mine bounces to when it gets up to operating temp when I am sitting a stop light, no metal shavings in the oil, I did have to replace my sending unit after my LT installation due to me breaking the old one, so I figure its a whack oil sending unit. After I open the car up though and run up the rpms it stops..?? so I don't know.

 

I've noticed mine bouncing a slight bit at idle as well. My RPMs do fluctuate as well. They jump 200 or so every few seconds.

Oil pressure is normal though *shrug*

 

me too, and only happens at operatin temp only....

 

96Z- No RPM fluctuation at all.

NEWBIE- Mine bounces about 5 PSI or less-never down to 0
Seafoam in on pass. side by TB. Now white smoke either out the back - all of it from my exhaust leak at my Y pipe!

Only see this @ operating temp. Runs STRONG, don't think it's a spun bearing. Sound like alot of you guys see this, now I don't feel alone.

Don't know about my sending unit- if it's been replaced. I haven't done it since I've owned the car. I mean, since it's owned me.

 

What are the symptoms of a spun bearing?

 

Do you mean the tube that runs into the TB and valve cover? Did you run it through the TB or the valve cover?

 

If your RPM's bounce around your oil pressure might move a little also. That used to happen on my Head/Cam A4 setup from last year.