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Old 10-12-2011, 07:05 PM
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SOUND: Crickets chirping?

Was driving around today and suddenly noted a chirping sound coming from the engine compartment. It's frequency was completely dependent on pedal pressure. The more skinny I gave it, the faster the chirp. If I suddenly let off the gas, the sound goes away.

I have a diagnosed exhaust manifold leak/crack, and at first I thought this was the source. But after getting home and crawling under the hood, it sounds like it might be a pulley or something up front.

Crickets chirping. Not ticking.

Any thoughts?

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Old 10-12-2011, 07:07 PM   #2
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Your belt or an idler pulley.

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Old 10-12-2011, 07:07 PM   #3
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idler or tensioner pulley? maybe your belt.
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Old 10-12-2011, 07:07 PM   #4
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beat me to it lol
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Old 10-12-2011, 07:13 PM   #5
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guess that's 4 of us that feel it's the belt, idler or tensioner pulley.

Bet the sound goes away after it warms up a bit.
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Old 10-13-2011, 08:38 AM
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Actuall it never went away. But I think you guys are right. I think I had this happen before. Have to check my notes... THX!
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Old 10-13-2011, 01:42 PM
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On a whim I sprayed all the pulley surfaces with silicone spray. Remembered this from a service guy. Sound went away. So I guess belt?
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Old 10-13-2011, 01:47 PM   #8
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Had the same problem. Put a couple drops of oil on the AC pulley shaft and it went away.
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Old 10-28-2012, 07:10 PM   #9
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I solved my "angry cricket" sound by replacing all the rubber elbows in the entire vacuum system. I knew I was on the money when I removed the one located under the brake booster (but not attached to it.) As I removed the elbow, the cricket sound got worse and I could then see the vacuum unit labor and the engine nearly died. I installed the new piece and it all went totally quiet.
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Old 10-28-2012, 11:40 PM   #10
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Sometimes an exhaust leak can sound like that.
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Old 01-24-2013, 09:12 PM   #11
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Loosen your belt. Turn everything by hand. If something is not turning fluidly, it will chirp or squeak at high speed. My idler pulley was not turning smooth, like the bearings were shot. 10 dollar idler from oreillys and noise was gone
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Old 01-25-2013, 12:09 AM   #12
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This might sound dumb. But check your hood latch. I have to grease mine every now and then or the squeaking will be back
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Old 04-10-2019, 04:18 PM   #13
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Did you ever find the cause of this noise you were having?
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Old 04-11-2019, 10:46 AM   #14
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Did you ever find the cause of this noise you were having?
If you have the same issue, remove the belt and spin each pulley by hand. Very likely an idler or tensioner pulley. My power steering pump started to chirp when it was going out, you could feel it wasn't smooth turning it by hand.
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Old 04-11-2019, 01:05 PM   #15
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If you have the same issue, remove the belt and spin each pulley by hand. Very likely an idler or tensioner pulley. My power steering pump started to chirp when it was going out, you could feel it wasn't smooth turning it by hand.
Also to add, with the engine iding and chirping...drizzle some water directly on the serp belt. If the chirping changes, then you know it's just a belt issue.
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Old 04-15-2019, 07:14 PM   #16
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My 04 LJ had a chirping at startup, turned out it was the OPDA going out.
Our 98 TJ just had it's second AC compressor put in after they both started chirping. It would go away if you turned off the AC.
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Old 04-16-2019, 08:58 AM   #17
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You can also remove the belt entirely and idle the engine for a short while to rule out most belt and pulley noises.

My problem is apparently the exhaust manifold to down pipe connection. The 98 I have has a metal gasket that goes between the manifold and pipe. I have replaced the manifold itself and all is well there, but after 3 attempts with new gaskets I can't get the connection to the pipe to seal properly.

There are two bolts the tighten that flange connection down, on the top and bottom. The connection leaks on the sides. My guess is the pipe is slightly ovalish or out of round or something. Not sure what to do at this point.

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