Nighttrainxprss

I have a 95 Camaro z28 with v8 5.7 lt1. When I start the car it whines/screams really loud... It also idles real high.
I just bought it and had to replace the floor shifter IE... It was stuck in 1st and the **** was broken. I replaced the tensioner pulley and removed the belt and it still does it... The mass air flow hose is a little worn and the IAC sensor was broken off... Any Idea on what could be making this noise?

Chimera96

does your engine oil have metal flakes in it?

Nighttrainxprss

No. It was over maybe a quart and a half or so though... I drained it

Injuneer

The IAC is not a "sensor".... it's an actuator that controls idle speed by moving a pintle in and out of the idle air passage. Did you replace it? What are you calling the MAF "hose".... do you mean the rubber inlet elbow? Does it have any holes or cracks in it?

When you start the engine cold, the PCM raises the idle RPM based on the coolant temperature. How fast does it idle? Does it slow down as the coolant temperature increases? Possible there's a damaged CLT sensor.

Is the AIR pump working? It will make a lot of noise if it's badly corroded.

Nighttrainxprss

Yes I replaced both the sensor and the actuator on the side of the throttle and just noticed that the relay fuse for the air pump looked kinda weird... Ima replace it and see how it goes. If not I'm gonna check the air pump itself out... Thanks bro I'll post a video if it still squeals...

Nighttrainxprss

Here's the video of the sound it makes... I'm kinda thinking that the access oil somebody put in burned out the engine bearings... So ima crack it open and see what I could find

shoebox

I'm going to guess something rubbing in the opti. Can you use a stethoscope to try to narrow it down?

Nighttrainxprss

Yea that's my next step... I'm gonna check it out today when I get off... I'll keep you posted

Nighttrainxprss

Ok so i contacted the previous owner and got some info... He says that the shifter cable went bad and the car was stuck in 1st gear... My question is what would go bad causing a loud screech/scream/whine? Could it be the clutch? Or cam bearings? Automatic transmission... Help me out please

Injuneer

Wrong forum.... the thread you started earlier about this is in the "LT1 Based Engine Tech" forum. I'll try and merge this post with that thread, so it makes sense. Might want to clarify which trans your car has. Only the auto trans has a "shifter cable". Only the manual trans has a "clutch".

Chimera96

OP

did you pull the accessory belt and start the car to see if it still makes the noise?

would help to rule out all the accessorys as being source of noise

Nighttrainxprss

Yes... The noise is coming from inside the heads or cam somewhere... Im pulling the heads tomorrow to see if anything looks worn... Looks like im doing a full rebuild after all SMH

shoebox

You would do that before checking the opti (or even water pump)?

Chimera96

you might want to take a step back before pulling your heads.

As has been suggested the WP or Opti (cap getting contact from rotor) may be the cause.

Hard to follow your threads...but I think you mentioned something about the air pump. It should only run for around a minute on initial cold start up...doubtful it is the air pump but unplug it to confirm it is not source of noise.

pulling heads is not really going to reveal much regarding noise if it is internal engine. The rod, crank or cam bearings failing would leave metal flakes in the oil if that is what is causing the screeching noise

Maybe your WP impeller is making contact with the WP housing...you could easily tell by removing the front cover from it or removing WP and spinning the spline shaft

you need to do more specific diagnostics before tearing apart the motor

Nighttrainxprss

Just replaced the opti with a jeg and completely disregarded the water pump when i seen that it was gear driven and not belt driven... But i removed a bunch of stuff already so ima take it out and inspect it...