Mild vibration

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David Stevenson

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New to the group. Any information would be greatly appreciated. I am having intermittent random mild vibration from what feels like the front driver's side. It doesn't occur when cold but once on the road for a while at low speeds, it comes and goes. Iwe check valves and solenoids have been replaced. I guess the noise could be coming from the engine because it does seem to be right before/after shifts but continues after. Also, not sure if related, I live in Colorado and during cold mornings it takes a few seconds to turn over but idles perfect. The noise also seems to be more pronounce while driving conservatively almost as if it's bogging. Took it to dealership and of course we couldn't recreate the noise. And no codes.
 
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grdsman

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David Stevenson said:
New to the group. Any information would be greatly appreciated. I am having intermittent random mild vibration from what feels like the front driver's side. It doesn't occur when cold but once on the road for a while at low speeds, it comes and goes. Iwe check valves and solenoids have been replaced. I guess the noise could be coming from the engine because it does seem to be right before/after shifts but continues after. Also, not sure if related, I live in Colorado and during cold mornings it takes a few seconds to turn over but idles perfect. The noise also seems to be more pronounce while driving conservatively almost as if it's bogging. Took it to dealership and of course we couldn't recreate the noise. And no codes.
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I would put money on it being the iwe still. Try putting it in 4WD and see if it goes away. Sometimes the iwe itself loses seal and tries to engage.



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grdsman

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I can’t say for sure unless the leak is bad enough that the hubs are actually engaged when it’s cold and eventually start holding vacuum when the seals get warmed up a bit and then begin to disengage some. Just a guess


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David Stevenson

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Didn't occur today. I tried recreating it. But I did notice more of a bog at low speeds 5 to 15mph. Or letting off the gas lightly. Im going to check that maybe it's a faulty fuel injector. I also checked the mpg and it's very low 10.0 and I usually get 13 here on Colorado winters and crappy winter gas.

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David Stevenson

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So I do believe it's the iwe, vacuum leak somewhere. I've tried to look online but couldn't find anything. It's not the check valve or the solenoid. At idle I unplugged it from the actuator and it had vacuum. So it only occurs while driving, mainly while at lower rpm. I've got a new complete vacuum line coming in but I was wondering if there is a vacuum reservoir in these newer models. The 04 to 08 has one behind the battery. Also how much per inch vacuum should it have at the actuator at idle?

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grdsman

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David Stevenson said:
So I do believe it's the iwe, vacuum leak somewhere. I've tried to look online but couldn't find anything. It's not the check valve or the solenoid. At idle I unplugged it from the actuator and it had vacuum. So it only occurs while driving, mainly while at lower rpm. I've got a new complete vacuum line coming in but I was wondering if there is a vacuum reservoir in these newer models. The 04 to 08 has one behind the battery. Also how much per inch vacuum should it have at the actuator at idle?

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You could test if the iwe is losing seal by hooking a vacuum tester up to the line. If it holds, your iwe isn’t the culprit.


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David Stevenson

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I've got a guage. Do you happen to know what the vacuum should be at, during idle, at the vacuum line?

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grdsman

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David Stevenson said:
I've got a guage. Do you happen to know what the vacuum should be at, during idle, at the vacuum line?

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You should be able to hold between 20-24 psi. If the gauge drops over a 5 minute hold, then you have an iwe leaking. They are on the same main line, so you would have a hard time telling which one is leaking. If they fail the test, just replace both of them.


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