'94 Grand Cherokee chirping sound coming from engine? - JeepForum.com

 
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post #1 of 10 Old 07-17-2008, 03:43 PM Thread Starter
81Euro
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'94 Grand Cherokee chirping sound coming from engine?

Greetings,

I have a 1994 Grand Cherokee Laredo 5.2L V8 AT.
When the engine is cold, or has been sitting for a few hours (unless under extreme high temperatures), the engine area produces a "chirping sound." After the engine has been running (10-12 miles), the chirp quiets down.
The sound is loudest when I accelerate.
I've had a new water pump installed, as well as the idling/tension pulley and new serpertine belt.
The serpentine belt is NAPA, not a factory Jeep belt. I've had mechanics say putting a factory belt on it might help. Does anyone think, in addition to installing a factory belt, that the problem could be a bad bearing in the alternator?
The voltage gauge in the instrument panel cluster hovers around 11-13, which is a little lower than that in my 1994 Cherokee SE 4.0L.
Thanks for any input. The chirping drives me nuts!

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post #2 of 10 Old 07-17-2008, 05:52 PM
ibskunk
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1998 ZJ 
 
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sounds like the tensioner they would chirping sounds when it does it take a 155 mm wrinch on it and pull in it while it is running and see if is stops but beware the fan
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post #3 of 10 Old 07-18-2008, 04:38 AM Thread Starter
81Euro
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I just drove the Jeep early this morning for about 5-6 miles. When I started it, it started the chirping in the park position. As I started out, it was chirping up a storm. Towards the end of the drive, if I let off the gas, the chirping quieted down some, but started back up very loud as I accelerated.

It really sounds like something that needs to warm up in order for the chirping to calm down.

So just try to tighten the tension pulley as the engine is running? Thanks.
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post #4 of 10 Old 07-18-2008, 08:15 AM
sandman
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listen around all the pulleys. i have had an idler pulley, a harmonic balancer and an AC clutch chirp at me. sounds like it could be a tensioner too. your gonna have to listen to find out what pulley it is. if i were you i would try to find the squeaky pulley by either listening to it or looking for a slight wobble. if you think you found it and it is infact a pulley with an external bearing on it, i would squirt some spray lube on it. if it shuts up, thats your pulley. even if the lube shuts it up replace it because it could fail at any time leaving you stranded.

1993 Jeep ZJ. 4.0
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post #5 of 10 Old 07-17-2010, 08:04 PM
tylersjeep
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alternator

Hi i'm new to this jeep form....

i need some ideas I bought two alternators from a junkyard and they where tested good. I took it to auto zone they said its no good no charge or voltage ? i put it in my car it work for a day then stop so the junkyard sent me one again and that one i took to auto zone they said it was no good i put it in and no charge 000... if the junkyard is saying its good and it testing bad at auto zone are the alternators really bad or is it a voltage thing? i had AAA come out 6 times and they said the alternator no good. so i called car-go alternators and starters they said it might be my ecu? but i dont what to jump to far if it the alternator thats bad? i just order a new alternator i hope this works. if not is it the ecu pcm. by the whey what is the black box on the back of the alternator?
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post #6 of 10 Old 07-17-2010, 08:20 PM
melk
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81Euro - Try this: With it in park and idling push on the distributor cap. (Push down from the top, from the side, a couple different ways.) See if the chirping sound changes or stops.

I'm betting it's a bearing in the distributor. Ask me how I know.
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post #7 of 10 Old 07-17-2010, 08:24 PM
sirgildus
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I torqued my serpentine belt to the rated 175 and the chirps went away.
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post #8 of 10 Old 07-30-2010, 08:39 PM
cherokeeman96
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I pushed on my distributor and when I pushed towards engine block it stops and let go it resumes. What did you do to fix this. Thanks
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post #9 of 10 Old 07-31-2010, 07:46 AM
02Lightning
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Quote:
Originally Posted by cherokeeman96 View Post
I pushed on my distributor and when I pushed towards engine block it stops and let go it resumes. What did you do to fix this. Thanks
I'm sure new distributor.

1995 Jeep Grand Cherokee Limited 4.0L NP249 Transfer Case, 42RE, 212,000 miles
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post #10 of 10 Old 07-31-2010, 07:54 AM
melk
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It's a worn out bearing in the distributor. You can get one from AutoZone or Oreilys etc for about 75, minus $25 core charge so about $50 bucks if you turn in your old one.
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