1850 RPM Vibration

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1850 RPM Vibration

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1850 RPM Vibration - 10/26/2006 9:13:25 AM

Ghostrider

Posts: 545
Joined: 9/18/2006
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I have a NASTY vibration of something at 1850 RPM's.
It sounds like a brake line banging up against the frame and making a motorboat noise.
I haven't been able to hunt it down yet because its only when the engine is under load and I'm not quite brave enough to put the engine under load at 1850 RPM's and then start crawling around under there.
Its reallly annoying because 1850 RPM's happens to be 35 MPH and 45 MPH so city driving is awful...The monsoon system cant even fix it!
Anybody had this and know what I should be looking for?

Post #: 1

RE: 1850 RPM Vibration - 10/26/2006 11:53:25 AM

Linus Gump

Posts: 960
Status: offline

You might have dented something, like a driveline, or broken something like a mount. I would recommend you take it to the dealer to have them look it over and fix it.

(in reply to Ghostrider)

Post #: 2

RE: 1850 RPM Vibration - 10/26/2006 12:15:54 PM

Dennis

Posts: 7584
Status: offline

I ditto Linus...Also check to see if your exhaust pipes are not misaligned too and banging against the underbody somewhere.

(in reply to Linus Gump)

Post #: 3

RE: 1850 RPM Vibration - 10/26/2006 1:16:08 PM

SedonaBoundH3

Posts: 82
Joined: 8/8/2006
Status: offline

Have you tried a lower gear to see whether its excited by engine speed or wheel speed? If it's the exhaust banging on something all of a sudden, check you motor mounts too.

(in reply to Dennis)

Post #: 4

RE: 1850 RPM Vibration - 10/26/2006 2:44:19 PM

jlock71

Posts: 46
Joined: 9/25/2006
Status: offline

check the e brake cable under the driverside floor area . it has been noted to vibrate against the chassis . there is a bulitin on it

(in reply to SedonaBoundH3)

Post #: 5

RE: 1850 RPM Vibration - 10/26/2006 4:29:49 PM

Ghostrider

Posts: 545
Joined: 9/18/2006
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Its engine speed..not wheel speed.
I certianly would hope its not a dented driveline or broken mount. If it is, this will never survive off road since the worst abuse its had would be going over a manhole cover...
I'll check the e-brake cable..the other thing that came to mind was when I crawled under there for running wires for the backup lights, the clips that hold the brake lines (i assume is what it was..being the metal tube.) were not in place on the chassis. I also had the shifter motor replaced not long ago so I'm hoping its just another clip that did not get put back. I'll dig for vibrations after work. If nothing sticks out, I guess I'll take it to the dealer.......ugh...such a long drive.

(in reply to jlock71)

Post #: 6

RE: 1850 RPM Vibration - 11/5/2006 11:20:20 AM

tteazis

Posts: 15
Joined: 11/2/2006
Status: offline

Check the Air Filter Box.

When I installed the "True Flow" intake system, the air filter box was vibrating around the same RPM. This intake uses the stock box. The noise was very loud in the cabin.
The solution was to losen the intake hoses, push the air filter box toward the engine and re-tighten. This kept the box from hitting.

(in reply to Ghostrider)

Post #: 7

RE: 1850 RPM Vibration - 11/26/2006 10:54:30 PM

Ghostrider

Posts: 545
Joined: 9/18/2006
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Not to bring up old threads but I FINALLY found the source of the noise.
It was more of a GROWL and less of a vibration. I could tell by the noise it was nothing as serious as anybody mentioned. Definately metal on metal vibration. And I could get it to do it while power braking so it was not anything with the drivetrain. The engine just needed to be under a decent load.

Turned out to be the passenger side engine heat shield vibrating against the block. I have a feeling the service guy leaned on it while changing the fluids or something and it bent it up against the engine. Just a little tug to get it away from the block and the nosie is gone!!!!

(in reply to tteazis)

Post #: 8

RE: 1850 RPM Vibration - 11/26/2006 11:13:07 PM

dilo2001gt

Posts: 4300
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Glad it was that simple nothing major

(in reply to Ghostrider)

Post #: 9

RE: 1850 RPM Vibration - 11/26/2006 11:16:56 PM

Dennis

Posts: 7584
Status: offline

Took him 30 days to get back with us though...

tapping foot

(in reply to dilo2001gt)

Post #: 10

RE: 1850 RPM Vibration - 11/26/2006 11:27:11 PM

Ghostrider

Posts: 545
Joined: 9/18/2006
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haha NOPE! took me 30 days to find it!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

I have traveled every inch of that ****ing thing and checked every bolt I could reach. At one point I had put pipe insulation all the way down the length of the E-brake, fuel line and brake lines. I took allll the skid plates off. I taped every clip as tight as I could to the frame...I even put a video camera under the truck hoping to spot the shaking part. It finally took a 2nd person to bravely reach around in the engine compartment while it was making the god awful noise while I power braked it at 1900 RPM until they burned themselves but also stopped the noise at the same time. It was vibrating so fast and so slight that you couldnt see it with your eye until you touched it and it silenced it. I imagine that it still shakes, just not against something. And I was surprised to find out that what I thought was a nice clean block is actually a textured piece of metal designed to look like an engine. I'll get some pictures sometime but if you tap on the side of the engine under the MAF, youll find that its not the block...just a cover. A hot cover so do it while its had a while to cool.

So I wish I was just a slacker there but I've been messing with this growl 5 nights a week for the last month and I found another strange and obscure part that nobody even knew we had

EDIT: For the record I found it at 6:30pm tonight

< Message edited by Ghostrider -- 11/26/2006 11:29:51 PM >

(in reply to Dennis)

Post #: 11

RE: 1850 RPM Vibration - 11/27/2006 8:25:53 AM

sconnoll

Posts: 67
Joined: 7/13/2006
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just so happens mine is going to the dealer for the same reason today....vibration @ 1850-1900 rpms...I am not crawling around when they should just fix it.

(in reply to Ghostrider)

Post #: 12

RE: 1850 RPM Vibration - 11/27/2006 9:02:53 AM

crank

Posts: 191
Joined: 5/30/2006
Status: offline

DITTO! My growl happens around the 1800 rpm mark then goes away above that mark. It's engine related and not movement. It's been doing that for over two months now. It seems to get worse daily.
Good info guys. Thanks.

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Post #: 13

RE: 1850 RPM Vibration - 11/27/2006 9:11:05 AM

Ghostrider

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Joined: 9/18/2006
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You dont have to crawl around..its really a 5 second fix now that we know where it is. Just grab and pull a little. If it still does it, grab and pull again!

(in reply to sconnoll)

Post #: 14

RE: 1850 RPM Vibration - 11/27/2006 10:56:05 PM

sconnoll

Posts: 67
Joined: 7/13/2006
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turns out the skid plate was loose and the catalytic converter had a screw missing...as soon as i told the service guy i had a vibration @1800 -1900 rpm's he described it to me....must be a known problem....no biggie they gave me a brand new cadillac cts to drive to work...they were done by 5 so one day in and out....i did have them do the 6000 mike service also..98.00 with tax...(oil change and tire rotation,balance)

i will note this.... our H3's drive allot smoother than that CTS....

(in reply to Ghostrider)

Post #: 15