Mechanics

HOWLING SOUNG COMING FROM INTAKE MANIFOLD EXP

2000 Ford Explorer

I have a 2000 Ford Explorer, 4.0L V6, manual transmission, 125,000 miles. Purchased 2 years ago from private seller. In hot weather (never in temps below 70-75), there is a very loud howling sound coming from the intake manifold when sitting still, such as at a red light, or in a restaurant drive through. Today doing 75 on the freeway in 101 degree heat, rapidly lost speed from 75 to 60 with foot on gas. No power was lost to the radio, air cond. No engine light came on. Geared down from 5th to 4th and was able to recover speed. Exiting the freeway at a light, she stalled out. Started very easily, brought her home, removed the intake tube and started her up, the noise was still there, but not as loud. Revved the engine, then it just died. Started very easily again but still with the howling noise. The intake manifold looks dirty (carbon) but nothing too extreme, what are possible causes and solutions? Any help would be greatly appreciated.
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Scrram
August 8, 2007.



I am having the exact same problem and I can't find any information about the problem. I have replaced my thermostat, ETC sensor and cleaned the IAC. Nothing works, the next thing I am going to try is to clean the MAF. If that works I will let you know, in the meantime, if you find the answer, let me know!

Tiny
Creativedisaster
Aug 30, 2007.
I am having the exact same problem and I can't find any information about the problem. I have replaced my thermostat, ETC sensor and cleaned the IAC. Nothing works, the next thing I am going to try is to clean the MAF. If that works I will let you know, in the meantime, if you find the answer, let me know![/Quote: b02c174eee]

We replaced our " Idle air intake control valve" 49.99 at auto zone. It is on the top drivers side of the air intake manifold. Has a black plastic " button" looking valve on it and a " computer" type wiring harness plugged into the back of it. VERY simple to replace and cleared the problem up immediatly. Let me know if this helps.

Tiny
Scrram
Aug 31, 2007.