lexluthier72 Posted January 14, 2012 Share Posted January 14, 2012 Hey all, So...recently the truck has developed a noise after shutdown. Hard to describe the noise exactly. Sounds like a slight grinding noise, rather than a squeal. Happens for a few seconds almost every time. Currently its about 10 degrees out here, so I have not had time or warmth enough to check it out further. I thought Id get some opinions on where to look first. My only 2 thoughts are: Stuck starter gear? OR Fan clutch bearings? -Erin Link to comment Share on other sites More sharing options...
Geonovast Posted January 14, 2012 Share Posted January 14, 2012 Starter has absolutely nothing to do with shutdown or running. It's used for startup.. Fan clutch could be a good bet. I would start it up, let it warm up, pop the hood, and have someone shut it off while you listen for the noise in the engine bay. Link to comment Share on other sites More sharing options...
mvusse Posted January 14, 2012 Share Posted January 14, 2012 If the gear stays engaged after startup it could be the starter, with the noise not being noticeable over the engine. If it is, it will almost certainly burn up in the next few days. Fan clutch can be checked by hand in about 2 seconds. Could also be the throwout bearing. Link to comment Share on other sites More sharing options...
lexluthier72 Posted January 14, 2012 Author Share Posted January 14, 2012 no weird noise coming from the throwout bearing otherwise (ie, when I press in the clutch) I will check the fan clutch when I get a helper to turn off the engine while I have my head under the hood. I have had the "stuck" starter gear before, and it sounds similar....Thanks for the tips! I'll report back when I know more. Link to comment Share on other sites More sharing options...
AMCJeepMJ Posted January 15, 2012 Share Posted January 15, 2012 about a half second after shutoff? can you feel the gas pedal move when it makes the noise? try it out; see if it moves. Link to comment Share on other sites More sharing options...
raviolli Posted January 15, 2012 Share Posted January 15, 2012 i get this strange feeling that youre hearing the same sound i hear every time i shut my truck off. i too have the 2.5L and it IS, in fact, very difficult to describe. ive always wondered what it is Link to comment Share on other sites More sharing options...
87Chief Posted January 15, 2012 Share Posted January 15, 2012 I get the same one. Like a relay clicking almost? Every time I shut it off, although I have not checked the gas pedal move (why would it, is there a reason?) I have a 1987. Link to comment Share on other sites More sharing options...
lexluthier72 Posted January 15, 2012 Author Share Posted January 15, 2012 Yes...Like a half second after shutdown. And...also...why check the gas pedal? I'll know more tomorrow when I have a helper, but any additional info would be appreciated. I suppose a sound like a clicking relay (only really loud) From inside the cab it sounds like its coming from the drivers side?!? -E. Link to comment Share on other sites More sharing options...
AMCJeepMJ Posted January 15, 2012 Share Posted January 15, 2012 There is a little motor that sets the throttle under the hood at shutoff [on drivers side, top of engine]. It moves the throttle cable about a quarter of an inch so you should feel the gas pedal move. Mine has 'buzzed' since day one, and only buzzes [for lack of better description] about a half-second after shutoff, for about a second. If you have a helper, have them shut off the engine while you are looking under the hood. It'll be easy to spot. Link to comment Share on other sites More sharing options...
lexluthier72 Posted January 15, 2012 Author Share Posted January 15, 2012 Thanks mister! Will check it out in the morning. -E. p.s.- IF thats it...how does one fix it? What is said part called? And...Is it still available? Link to comment Share on other sites More sharing options...
AMCJeepMJ Posted January 15, 2012 Share Posted January 15, 2012 Not sure what it's called, or if they're available. I'm sure a salvage yard will produce several, but they may be in similar condition. I'm sure one of the veterans around here will come up with the correct name for it. I considered greasing/lubing/somethinging mine to lessen the noise since the plunger that moves appears 'dry'... it may be a friction situation but am hesitant to put anything flammable on it due to the proximity of the engine to it [inches]... so I just live with it and consider it just another 'quirk' of the truck. I'll see if I can get a pic of the little beastie. Link to comment Share on other sites More sharing options...
AMCJeepMJ Posted January 15, 2012 Share Posted January 15, 2012 Ok, I went out to get a pic of it... used a LED flashlight and cell phone camera so sorry if its not the best pic in the world. I hope this is the same part that is what is making noise on your rig once you check it out at your end. Image Not Found Link to comment Share on other sites More sharing options...
lexluthier72 Posted January 15, 2012 Author Share Posted January 15, 2012 Idle speed actuator motor....(had to look it up in the manual) Will check in the am. Looks like Napa might carry it if thats the issue. Link to comment Share on other sites More sharing options...
Jeep Driver Posted January 15, 2012 Share Posted January 15, 2012 Yeah I assumed that's what that was......idle-up for warm-up and AC? Well mine is dead completely. New one as soon as I get the extra chink- http://www.ebay.com/itm/New-Throttle-Bo ... 45fd4afb54 Link to comment Share on other sites More sharing options...
Jeep Driver Posted January 15, 2012 Share Posted January 15, 2012 BTW if ever you need a new FI this is the cheapest I have found- http://www.fuelinjector.citymaker.com/c ... 101082.htm I realize it's unrelated to the thread......just FYI. Other places list 'new' for around $150 Link to comment Share on other sites More sharing options...
Truckcom Posted January 15, 2012 Share Posted January 15, 2012 I have a similar problem with my 88 pioneer 4 liter. It's the servo for the electronic cruise control. If I turn off the cruise control on the turn signal mounted control, the noise stops immediately. I don't have the noise after every shut down even if the cruise is on. I am curious, by the way, of any others who have this system. It appears to be factory installed but I have never seen any reference to it in any of the repair manuals. Link to comment Share on other sites More sharing options...
lexluthier72 Posted January 15, 2012 Author Share Posted January 15, 2012 No cruise control. Oceanic...You are on the right track. Sure enough, the gas pedal moves at the same time the noise is present. Waiting on helper to confirm under the hood.... Link to comment Share on other sites More sharing options...
Harley Posted January 15, 2012 Share Posted January 15, 2012 mine does the same thing. Always thought it was normal as in setting the throttle for cold starts. Link to comment Share on other sites More sharing options...
lexluthier72 Posted January 15, 2012 Author Share Posted January 15, 2012 The noise just showed up on mine. I do not think its supposed to be this loud, probably means the motor, or the gear on the shaft end is shot/going out. Link to comment Share on other sites More sharing options...
Harley Posted January 15, 2012 Share Posted January 15, 2012 If its not normal maybe I should fix mine too. Waiting for results............ :popcorn: Link to comment Share on other sites More sharing options...
lexluthier72 Posted January 15, 2012 Author Share Posted January 15, 2012 May have to wait till next payday....Looks like average is 95$ for it. Napa has one for 75$....Will report when I know more. -E. Link to comment Share on other sites More sharing options...
AMCJeepMJ Posted January 15, 2012 Share Posted January 15, 2012 Of some related note, my MJ does not have cruise control. If you found the part on napaonline.com, please post up the link so I may look deeper into replacing mine. Link to comment Share on other sites More sharing options...
lexluthier72 Posted January 15, 2012 Author Share Posted January 15, 2012 I'm pretty sure this is it: http://www.napaonline.com/Catalog/Catal ... 0336299362 They also show one with a new bracket for $150!!! I'll have to call and make sure this is in fact the right one. It looks like the one in the truck. I did confirm that is the noise. Looks easy enough to replace....Id also like to know if any of the "gurus" know of any place to get it cheaper.... -E. Link to comment Share on other sites More sharing options...
mvusse Posted January 15, 2012 Share Posted January 15, 2012 What threw me off is you described it as a "grinding" noise. Mine sounds more like a CD player loading or ejecting a CD. Mine is 25 years old, I think it's allowed to make a bit of noise. When it quits making noise is when I will start to worry about it. Link to comment Share on other sites More sharing options...
lexluthier72 Posted January 15, 2012 Author Share Posted January 15, 2012 If you really listen to it, it sounds like a frozen DC motor, which is exactly what it really is. Buzzing/grinding, CD ejecting....could all describe the noise, from different perspectives really. I did confirm that is the problem....Any idea if the link I have is the correct part? Link to comment Share on other sites More sharing options...
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