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Old 08-26-2009, 07:48 PM   #1
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What is this pulley?

Ok, so I have been battling a rough idle for a while now and I was wondering if this could be an option. So I have this pulley, on the right side of the alternator and I think it might need to be replaced. It has some kind of scaring on it and little bumps. It has a little bit of play too going back and forth like it isn't alll the way tight, but it is as tight as I can get it. The reason why I think that this might has to do with my rough idle is because it gets cut in half when I turn the AC on. So its sounds like that could be it maybe? I have pics of it.
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Old 08-26-2009, 07:56 PM   #2
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its just an idle pulley and the only real issue with them is the bearings generally go bad. hopfully that will help alittle.

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Old 08-26-2009, 08:04 PM   #3
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Would that cause any problems?
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Old 08-27-2009, 12:49 PM   #4
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It's there to keep the belt shaped correctly and maintain tension. If it's going bad, you need to get a new one. I replaced one of mine already on my 2002. I don't know if that would make a rough idle, but it would make the belt spin incorrectly.
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Old 08-27-2009, 01:10 PM   #5
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The idler pulley! It won't affect your idle! They will damage your belt as they get old! They will also start making noise rattle, squeaking, and eventually grinding. I've put 2 on my '04 with 40,000 miles but I do a lot of mud! I have rough idle most of the time not like a race cam just a little rough! Everybody I talked to said it's a Jeep!
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Old 08-27-2009, 01:20 PM   #6
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the thinkgs that would give you a rough idle, are bad spark plugs, a bad coil, a loose connection on a injector. a bad injector, tons of carbon build up.
make sure your plugs have the correct gap. the reason why your mrough idle gets cut in half when the ac is turned on is because your motor revs higher with the ac on at a idle. I would still replace that idler pulley its really easy.

grab a can of seafoam too.
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Old 08-27-2009, 06:01 PM   #7
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Ok, thanks guys.
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Old 08-27-2009, 06:04 PM   #8
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seafoam works wonders...and makes a hell of a cloud of smoke haha
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Old 08-27-2009, 06:06 PM   #9
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I just changed my oil like two days ago though. Shouldn't I wait?
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Old 08-27-2009, 06:12 PM   #10
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for what? the sea foam?
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Old 08-27-2009, 06:15 PM   #11
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yeah. I've heard that you should do it right before an oil change
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Old 08-27-2009, 06:19 PM   #12
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i dont remember when i used it. but when i did it we just hooked it up to a vacuum line
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Old 08-27-2009, 08:16 PM   #13
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I did it on my truck it does work good, but I did it the day before my oil change.
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Old 08-28-2009, 05:13 AM   #14
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theres three different ways to use it,...in the gas tank, in the crankcase (right b4 oil change), and then the vaccuum line method through the throttle body. The last one I would think is mot effective. I heard it may sometimes foul out your plugs though???
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Old 08-28-2009, 05:45 AM   #15
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I took off my hose to my throttle body and dumped it right into the body itself. Do it slow and make sure it sucks into the side port that the IAC is in, you will see it suck in. The engine will stumble and smoke the trick is to do it just enough but not stall the engine. Do this a few times and you will be good to go. It did not foul my plugs, and fixed my rough idle pretty much right then.
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Old 08-28-2009, 09:48 AM   #16
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ya i didnt foul any plugs either. i just disconnected a vacuum line and sucked it straight from the can thru that line. as meyers said the engine will stumble and smoke tho
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Old 08-28-2009, 12:31 PM   #17
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Just a little vid on using sea foam.

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Old 11-30-2009, 10:45 AM   #18
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does anyone know the diameter of this pulley? Confusing on Autozone's site. one is 90mm and the other is 76mm. Kid's jeep is broken down on the road, must get today. '98 TJ 4.0L w/ac and power steering.
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Old 11-30-2009, 12:30 PM   #19
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seafoam = miracle in a can
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Old 11-30-2009, 12:34 PM   #20
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bump. does anyone know the diameter of this pulley? Confusing on Autozone's site. one is 90mm and the other is 76mm. Kid's jeep is broken down on the road, must get today. '98 TJ 4.0L w/ac and power steering.
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Old 11-30-2009, 12:51 PM   #21
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i had an idler fail on my dads old grand cherokee. ball bearings fell out and the pully cocked itself sideways and chewed half way through the mount before it finally threw the belt. overheated the jeep to because he decided to drive it the rest of the 10 miles home.....

leland: its raining so i cant measure mine but i would think thats a 76mm, just doesnt look big enough to be 90. also i would think that the belt tensioner would be able to make up the difference between the two since it normally sits half compressed and were only talking a 6mm difference in radius. did his idler also fail the way i described?
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Old 11-30-2009, 01:58 PM   #22
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Quote:
Originally Posted by leland View Post
bump. does anyone know the diameter of this pulley? Confusing on Autozone's site. one is 90mm and the other is 76mm. Kid's jeep is broken down on the road, must get today. '98 TJ 4.0L w/ac and power steering.
mmmmmm....don't know I did a search and came up with three. One for manual steering, one for power steering, and one for adjustable idler.

P/S is #231098
Adjustable is #231097

They are running $21- $25
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Old 11-30-2009, 05:49 PM   #23
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So I bought an idler pulley from summit and they sent me the pulley from the tensioner and I didn't know it and put it on. Well it didn't work so well in the wrong spot and ripped apart the new pulley and belt, so I had to replace it again. The pulley for the tensioner is 70mm and the other one that is in my pic that I changed is 76mm.
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Old 12-01-2009, 09:08 AM   #24
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Originally Posted by 350chevrolet View Post
i had an idler fail on my dads old grand cherokee. ball bearings fell out and the pully cocked itself sideways and chewed half way through the mount before it finally threw the belt. overheated the jeep to because he decided to drive it the rest of the 10 miles home.....

leland: its raining so i cant measure mine but i would think thats a 76mm, just doesnt look big enough to be 90. also i would think that the belt tensioner would be able to make up the difference between the two since it normally sits half compressed and were only talking a 6mm difference in radius. did his idler also fail the way i described?
Thanks, it is the smaller of the two (76mm). the 90mm is the adjuster pulley under the P/S pump. It just seized and burned the belt up, and blew the lower hose. We fixed those, but the engine ran rough, and voltmeter dropped to zero (intermittantly). we replaced alternator...doing the same thing still. I am lost.

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