loud clicking/humming from front end
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loud clicking/humming from front end - 7/21/2008 2:23:35 PM
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second97
Posts: 18
Joined: 6/17/2008
Status: offline
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so im a little new to the whole blazer thing ive been driving 2.2s10s for the past 4 years. basically i decieded to pick up a 99 4x4 jimmy. any time im doing highway speeds for an extended period of time there is a loud clicking/humming from the front end. sort of sounds like i ran over a gxsr and its caught under the front end. i didnt know what it was so the third time it happened i was on the highway and thought it would be a good idea to throw it in neutral and rev it. i guess i hit the rev limiter too hard because it spun a bearing. so now im rebuilding the engine and am trying to figure out the front end noise at the same time. i dont know if it is something with the hubs? are they vacuum actuated? the truck has roughly 120,xxx miles any help would be greatly appreciated.
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RE: loud clicking/humming from front end - 7/24/2008 10:18:26 AM
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second97
Posts: 18
Joined: 6/17/2008
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what? no one has any input
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RE: loud clicking/humming from front end - 7/24/2008 5:41:38 PM
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Yooper
Posts: 156
Joined: 3/13/2008
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I have had this same problem. Does the noise go away when yuou slow back down to around 25 MPH? Mine does, I still haven''t been able to figure it out.
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RE: loud clicking/humming from front end - 7/24/2008 5:45:13 PM
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Tippman7641
Posts: 620
Joined: 11/27/2007
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could be a ball bering mine would only do it avbove like 20 when i turned slightly
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RE: loud clicking/humming from front end - 7/26/2008 4:34:42 AM
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second97
Posts: 18
Joined: 6/17/2008
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its actually a little weird it will stop below like 35. and if i go back up any higher that that it starts up again. and it hasnt caused any problems like that yet?
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RE: loud clicking/humming from front end - 8/5/2008 7:39:15 AM
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klausjohn1142
Posts: 7
Joined: 4/22/2008
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I also had the same problem happen once. Is your 4whdr acctivated by switch or on the floor? If on the the floor or when the sound happens do you have any flashing lights on your 4w switch or on the floor indicator?
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Klausjohn1142@yahoo.com
1996 Chev Blazer LT 4x4
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RE: loud clicking/humming from front end - 8/7/2008 10:09:48 AM
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second97
Posts: 18
Joined: 6/17/2008
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its the push button, and the 2wd light will sometimes just turn off for about a minute then turn back on but that doesnt always happen while im having the problem
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RE: loud clicking/humming from front end - 8/8/2008 7:13:06 PM
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danmiranda
Posts: 62
Joined: 1/30/2008
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I just had the same problem, I have a 97 4WD S10 Blazer. Turned out to be the Wheel Bering. I had replaced the wheel hub and bering (came with that), and it seemed to fix the problem. I also have to replace the the ball joints as well. So I''d really give your Blazer a good inspection to make sure you don''t have to tear it apart several times to fix a problem.
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RE: loud clicking/humming from front end - 9/22/2008 6:07:57 AM
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second97
Posts: 18
Joined: 6/17/2008
Status: offline
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i had my mechanic who is also a good friend of mine take a look at it and he ended up replacing the hub bearing because it was pretty bad but it still hasnt fixed the problem. any more ideas im about ready to put a brick on the gas pedal and send it off of a cliff.
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RE: loud clicking/humming from front end - 9/22/2008 6:09:24 AM
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second97
Posts: 18
Joined: 6/17/2008
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oh just in case anyone tells me to use the search button there are multiple people who have had this problem and the question was never solidly answered
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RE: loud clicking/humming from front end - 9/22/2008 6:19:31 AM
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swartlkk
Posts: 14299
Joined: 5/1/2005
From: Waterloo, NY
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But have you tried ANYTHING from those posts or did you just read and dismiss when you did not see a "Its fixed" post? If you did try somethings, what have you checked and what was the outcome? The only thing that we can do is tell you what to check and I find it a waste of time to keep stating the same things over and over again.
At some point it would be nice to actually fully define the checks that must be performed on the 4wd system and have them in one place for everyone to reference. I do not have an s-series anymore to snap pictures of, but we should get some pictures of the front axle where the actuator cable enters, the actuator under the battery tray, switch on the transfer case, electronic switch on the firewall (auto4wd models only), the encoder motor, TCCM, dash switch, and then run down through all of the functional checks on the parts that a DIY''er can do.
Right now, things are scattered through many posts. Often a simple search does not yield the answer that you are looking for. Frustration sets in and then things go down hill. The best advice I can give in regards to searching for things is to run an initial search and read through some of the threads returned. I would not start off by only reading, looking for a solution to your problem, but also paying attention to the terminology used. You may key in on some other phrases or terms that others use that can refine your search to yield better results. Also, if you know of certain people that look like they know their way around these trucks, you can further refine your search, keying in on their responses.
In the end we are all just trying to help!
< Message edited by swartlkk -- 9/22/2008 10:09:42 AM >
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Kyle-
2004 Rainier
1970 Chevelle - Resto
1974 K5 Blazer - Resto
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RE: loud clicking/humming from front end - 9/22/2008 5:58:12 PM
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second97
Posts: 18
Joined: 6/17/2008
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i think i have found the problem i started by checking the axle engagement canister under the battery. everything seemed okay. next i unpluged the vacuum lines from the switch on the transfer case. then i started up the truck and plugged up the line that was pulling a vaccuum so i didnt have a leak and took it for a test drive. gave the truck some juice, got it up to about 85 and no noise!!!! i have a feeling that when i was accelerating hard the loss of vac. pressure was causing the front diff to engage due to a faulty vac switch. ill replace it with in the next few days but for now im leaving the lines disconnected to make sure that was the problem
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