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Discussion Starter · #1 ·
Hi, new here, I have a 2000 Trooper 3.5L. It started making a electronic sounding high pitch noise from the engine compartment a few days ago. It sounds like its coming from the throttle body, so I unplugged it while running and the noise stopped. I did a search and came up with nothing.
 

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Discussion Starter · #4 ·
I swapped out the throttle body with a known good one and its still making the noise. I went over everything again looking for vac leaks and found nothing. I also removed the serpantine belt to see if it was a pully or accessory bushing but it still made the noise? Any other ideas?
 

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Discussion Starter · #7 ·
justwork said:
I have no clue. I would say a vacuum leak from somewhere. What do you mean you unplugged the TB while it was running and the noise stopped. What did you unplug? I didn't even think it would continue to run if it was unplugged.

Could it be a bad gasket between the TB and manifold?
I unplugged the wire connector that controls the TB and the noise stopped, it did send the computer into "Reduced Power" mode until I restarted the engine. I checked and changed the gasket too with no luck.
 

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Discussion Starter · #13 ·
Thanks for your input on this problem. They noise obviously has me scratching my head which is why I posted the video because it is such an odd sound. Hopefully I figure it out soon before the wife wants a new car! If I figure it out I will updated with some answers.
 

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Discussion Starter · #16 ·
dj_rob_e said:
here is a thought that i just had...... a friends ford escort did something almost exactly like this..... turns out that one of the wires that runs to the TPS on the throttle body was loose in one of the connectors..... it wasn't getting proper ground and it made an almost identical sound! something to think about...
That's a good lead. There is a 2000 trooper at a nearby pick and pull junk yard, I can probably get another plug for a few bucks.
 

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Discussion Starter · #21 ·
Update, the noise is gone, it just stopped on day and hasn't come back. I never got around to replacing the electrical plug. So it's still a mystery to me but I'm not complaining now that the sound is gone.

Thanks to everyone who offered suggestions!
 
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