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Loud humming

Tiny
SHAWJAMES19
  • MEMBER
  • 1998 MERCURY MYSTIQUE
  • 2.5L
  • V6
  • FWD
  • MANUAL
  • 190,500 MILES
When I have my car in neutral and I push on the gas and bring the rpms to around 4000 my car will make a loud humming/whining noise and when I let off the gas the rpms drop to zero and the car dies. What could be the cause of this and what can I do to fix this?
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Tuesday, March 1st, 2016 AT 4:20 PM

5 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You're dealing with two entirely different issues. The noise is probably a bearing in one of the belt driven components. You will probably have to use a stethoscope to pinpoint it.

As for the stalling.

First eliminate all vacuum or air leaks in the system (very important)

You may have a bad IAC ( idle air control), but try cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carburetor cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.
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Tuesday, March 1st, 2016 AT 4:27 PM
Tiny
SHAWJAMES19
  • MEMBER
  • 3 POSTS
Now my check engine light came on and I had it checked and it said the catalytic converter could be bad. Could that cause the same issue or would they be two separate issues?

Thank you for your time
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Friday, March 4th, 2016 AT 3:29 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
No, that would probably be three different issues. You should start fixing some of them.
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Friday, March 4th, 2016 AT 3:56 PM
Tiny
SHAWJAMES19
  • MEMBER
  • 3 POSTS
Will do, thank you
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Friday, March 4th, 2016 AT 5:26 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
The loud humming noise is the IAC this is a common Ford problem, please replace and get back to us.
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Monday, March 7th, 2016 AT 5:30 PM

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