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Unread 02-20-2006, 04:11 PM   #1
danray35e
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Chirping from engine

1996 Grandcherokee Laredo 4.0. 120 thousand miles
This sound just recently started. It coincided with some really cold weather. I don't know if that has anything to do with it. My first thought was idler bearing, belt, or one of the components the belts runs. I knew it was not coming from the wheels or driveshafts because it chirps in idle sitting in driveway. The sound lessens as I drive faster and sometimes goes away all together only to come back again later. I wanted to determine for sure that it was not the belt or any related belt driven components. So pulled the belt off completely, and started the engine without the belt just long enough to confirm that it was not belt related. I have not noticed any other symptoms. It drives just as well as it always has, just this annoying intermittant chirp which changes pitch with engine speed.

Any thoughts?

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Unread 02-20-2006, 04:20 PM   #2
10achik
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If you determined it wasn't the belt, then it pretty much sounds like the idler pully bearing. It usually starts squeeking when it's about to go, pretty cheap and easy fix.

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Unread 02-20-2006, 04:48 PM   #3
danray35e
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but I removed the belt completely and ran the engine for a few seconds and it still made the noise. If the idler pully is not connected to the belt, how could that be it?
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Unread 02-20-2006, 04:51 PM   #4
Varkyl
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Didn't someone just post about the distributor be able to make a noise similar to what you are describing?
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Unread 02-20-2006, 05:04 PM   #5
10achik
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Quote:
Originally Posted by danray35e
but I removed the belt completely and ran the engine for a few seconds and it still made the noise. If the idler pully is not connected to the belt, how could that be it?
Your right, I read through your post a little quickly, if the belt isn't connected the idler pulley wouldn't be turning. hmmm, I guess that rotor in the distributor cap could cause a squeek, like suggested. You could take it off and see what it looks like under there, if there is any corrosion then you would need to replace it anyway.
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99 GC Limited - 4.7L HO V8, 6.5" IRO HC LA lift, F&R D44s locked & trussed, 242HD, IRO TC Skid, KMA Bumper, 35's
2006 Saturn Redline -2.0L Eaton supercharged I4, GMPP Stage 2, Custom Tune, AEM CAI, Ebiach Pro Kit w/ swaybars, EVO Ventus V12s (13.76 @ 103.85)
2006 Pontiac G6 GTP
2012 Nissan Juke - (hers)
2000 SV650 - naked, integrated tail light, sliders, corbin, pilot roads, RK chain & sprokets, D&D full exhaust, FactoryPro Stage I jet kit, +4 Ignition Advancer, Barnett race clutch
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Unread 02-20-2006, 05:12 PM   #6
02Lightning
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I would get a stethoscope and start listening around on the motor to isolate it. Maybe itís a vacuum leak?
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Unread 02-20-2006, 08:42 PM   #7
Paintballer1970
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a bird? lol
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Unread 02-21-2006, 06:51 AM   #8
greasefingers
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Take your largest screw driver and place it on the distrubutor near the engine block. Place your ear on the plastic handle part of the screw driver and listen for the birdy.
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Unread 02-25-2006, 11:15 AM   #9
danray35e
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That could be a possiblity the sound does seem to be coming from that side of the engine compartment. I will check it out. Although I would say the chirping sound sounds like metal intermittantly sliding across metal sort of a ching ching ching sound.
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Unread 02-25-2006, 11:19 AM   #10
grandCherokee06
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Quote:
Originally Posted by 02Lightning
Maybe itís a vacuum leak?
My thoughts.
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Unread 02-25-2006, 01:58 PM   #11
danray35e
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hmm vac leak seems unlikely this noise is loud can hear it when driving and windows rolled up. It never gets louder or quieter but it does change in frequency of chirp sound with engine speed. Meaning as the engine speeds up so does the chirping. I would imagine a vac leak to change its pitch with changes in engine speed.
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Unread 03-08-2014, 08:57 AM   #12
jamcorne
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Diagnosis

Sorry to dig up an old thread, but this sounds exactly like my current issue. What did you determine was your problem?
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