Another Strange Noise Thread

[helievacpilot]

I know these "I've got a strange noise" questions are really hard to diagnose on the computer, but I'll give it a shot. Basically, I've replaced every rotating assembly EXCEPT the A/C compressor, P/S pump and vacuum pump. This winter, I have developed what is best described as a "jingling" noise coming from the drivers side engine compartment. Kind of like change in your pocket jingling. Everything functions, and it runs smooth. Seems to coincide with RPM as well. At idle, you can't hear it. It's not like any bearing issue I've ever heard, so I was wondering if the vacuum pump on it's way out could make this strange noise?
Thanks - Bill

[madpogue]

Does it happen on a cold engine? If so, remove the belt and run it BRIEFLY (remember, no water pump), rev it up, just long enough to see if the noise persists. That will tell you if it's one of the belt-driven accessories.

While the belt is off, check all the pulleys for looseness, roughness, etc.

[Patrick Feeley]

Use a nice big, long screwdriver or metal rod like a stethoscope (or the real thing if you have one) on the vacuum pump and other components. Be careful of course when doing this. You should be able to tell what component it is. Cheers!

[helievacpilot]

Thanks guys. Will check it out this weekend.

[pjsf250]

i had a friend of mine have a similiar noise on a different type of vehicle and it ended up a bolt loosened up on the flywheel and when running it would jingle like you mentioned
just a thought

[helievacpilot]

While I installed my new CPS, decided to trouble-shoot the noise. I did spray the vacuum pump, but I also discovered that the flip-up cover for the fuel bowl was vibrating and making a huge racket under the hood! I glued in a couple of rubber strips to make it more secure. So for now, no noise. I'll drive it for a while and see what happens.
Thanks - Bill