[Krazyykevin]

Can someone please help me diag this metal screeching noise on my mr2, It only happens on cold starts and goes away after about 30 seconds of driving

May 3, 2022

www.youtube.com

Thanks in advanced

 

[smcbride]

Is the air conditioner on or off? Without more information, one could suggest refilling your left blinker fluid. A few things cause screeching noise. Belts, air conditioner, alternator...that's about it. Everything else on a MR2 is electrical. The best option is to just lift the engine lid and listen while someone else starts your car. If you cannot pin point the location, my dad taught me an old trick about using a broomstick or screwdriver or anything solid and place it in various locations on the engine and put your ear to the other end. Sound will travel through the rod to your ear. This is how we determine which valve is clacking on motors.

 

[Krazyykevin]

Is the air conditioner on or off? Without more information, one could suggest refilling your left blinker fluid. A few things cause screeching noise. Belts, air conditioner, alternator...that's about it. Everything else on a MR2 is electrical. The best option is to just lift the engine lid and listen while someone else starts your car. If you cannot pin point the location, my dad taught me an old trick about using a broomstick or screwdriver or anything solid and place it in various locations on the engine and put your ear to the other end. Sound will travel through the rod to your ear. This is how we determine which valve is clacking on motors.

The AC was on for the clip, i will try the screwdriver trick, the thing is it doesnt happen every time either

 

[wildhippie666]

Mine used to do that same thing.
My solution was to blow a head gasket and then gen4 swap it.

//it's probably the washer covering the a/c belt tensioner pulley or something

 

[smcbride]

I missed the video the first time. That sounds like a whistle more than a screech. I would suspect an air leak on your BOV or manifold under turbo pressure.

 

[wildhippie666]

In all seriousness though check all your intercooler plumbing, throttle body bolt torque, everything to see if you have a boost/vaccum leak, and do the screwdriver or mechanics' stethoscope. I was never able to do the stethoscope because it would go away by time I got it out of the tool box and opened the engine lid.

 

[shiverdc2002]

That sounds a lot like the HKS "tweet" just very light.

 

[Krazyykevin]

I missed the video the first time. That sounds like a whistle more than a screech. I would suspect an air leak on your BOV or manifold under turbo pressure.

My bov has been broken since i got the car, i just got the block off plate in the mail today ill see if that fixes it

 

[Krazyykevin]

In all seriousness though check all your intercooler plumbing, throttle body bolt torque, everything to see if you have a boost/vaccum leak, and do the screwdriver or mechanics' stethoscope. I was never able to do the stethoscope because it would go away by time I got it out of the tool box and opened the engine lid.

ill do this with the stethoscope if the BOV block off plate doesnt fix it ty for the help

 

[shiverdc2002]

Always always always fix known issues before troubleshooting others.

 

[Krazyykevin]

it seems the BOV was the issue, ill have more info later on next week

 

[Krazyykevin]

BOV was not the issue, it started doing it again, i think its coming from the serpentine belt area

 

[smcbride]

Interesting. Up front noise? The idler pully on the belt has been known to make noise after some time. It should change significantly with RPM. I did not hear an RPM related type of screech though.