HELP--again

[cruzer]

Took the MM in for correction of a loud screaming sound at 2,500 +-200 rpm on starting cold--below 60 degrees---they want the car overnite--so I'm taking it back in at 3 PM---the advisor said it could be a belt idler or ????? the timing chain position sensor--I would really appreciate any advice before going back in tonite . It's under warranty, so cost is not the object---just would feel more comfortable with a little knowledge. Thanks in advance, Maury:help:

[thathotrodlincn]

If you can take the serpentine belt off - engine cold, start the car briefly. If the noise is gone, it is likely a belt tensioner/idler pulley bearing. If the noise is still there, noise is likelt inside the engine. Good luck with analysis and repair.

[RF Overlord]

There IS no "timing chain position sensor"...if he meant cam position sensor or crank position sensor, those are Hall-effect (magnetic) devices with no moving parts, so they can't make noise like that.

I concur with what thathotrodlincn said ^^^

[Blackened300a]

There IS no "timing chain position sensor"...if he meant cam position sensor or crank position sensor, those are Hall-effect (magnetic) devices with no moving parts, so they can't make noise like that.

I concur with what thathotrodlincn said ^^^

Exactly, there is a cam position sensor that works similar to a ABS sensor. Impossible for it to make a noise.
Its most likely either a idler or the tensioner pulley. Pop the belt off and see if the noise goes away.

[4play]

U should of consulted here before you ran to the dealership, would of saved u 100 bucks, its probably nothing but a bad idler 20 bucks and 5 minutes of labour.