Gas Pedal Vibration?

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Thomasville, GA
Ok, so a little backstory.

My 2wd Nissan Xterra has 86,000 miles. The wife got a new car (2013 Sonata), I sold my 2000 Frontier Crew Cab, and inherited the Xterra. After a few odds and ends, and after paying off the Xterra with the Frontier money, I had just enough left over to get the timing chains/guides done (common problem), as it was time.

Fast forward, I had a local shop do the work. They replaced all three chains, along with all new tensioners. New waterpump, and new thermostat. I got the truck back Monday afternoon, and I am not sure it has been this quiet since I have owned it. Of course, I have been riding around with the windows cracked and radio off to listen for any possible “noises”. So far there have been none. Also putting cardboard under the truck at night to check for any leaks from the service. I am a little anal, but I know you guys can appreciate that.

I have only driven the Xterra from the mechanic, and a little last night running errands, as Sunday, the cat got caught in the Sonata, and didn’t make it out in time. Since then, the wife hasn’t wanted to drive the Sonata for a few weeks.

Anyways, last night on the way home, I noticed what felt like a slight vibration through the gas pedal when you give it a good amount of gas. Of course this only happens when in the 2200-2300 rpm rang. Of course the wife says she doesn’t notice anything, but she also normally keeps it 2,000rpm or below.

The steering wheel doesn’t vibrate when this happens, and the truck rides as smooth as can be. I have narrowed drivetrain out of it, as it does it while in park and neutral. The motor mounts look good, but I still need to get under there and inspect them better, along with all of the heat shields.

Is it possible that this had something to do with the timing chain change, or is this just a separate issue?

Since the Xterra is drive-by-wire, is it possible to feel mechanical issues AT ALL through the pedal? Reason I ask, is if there is any chance that this issue is related to the timing chain/water pump install I had done 2 weeks ago, then I plan on taking it into the mechanic to have a look. If this has got to be a non-mechanical issue (i.e. motor mounts/heat shield/etc) then I won’t waste the mechanic’s time.

I am stumped.
 
Originally Posted By: 00Crew
as Sunday, the cat got caught in the Sonata, and didn’t make it out in time. Since then, the wife hasn’t wanted to drive the Sonata for a few weeks.


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I'm going to bet the exhaust is somehow rubbing on "something" and resonating the floor pan at those RPM. The floor pan then resonates your gas pedal.
 
Originally Posted By: eljefino
Originally Posted By: 00Crew
as Sunday, the cat got caught in the Sonata, and didn’t make it out in time. Since then, the wife hasn’t wanted to drive the Sonata for a few weeks.


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I'm going to bet the exhaust is somehow rubbing on "something" and resonating the floor pan at those RPM. The floor pan then resonates your gas pedal.


Kind of what I am hoping. Trying to decide if I need to have my wife run the Xterra by the shop the end of this week and let them test drive. If there is no way of engine problems being resonated through the drive-by-wire pedal, then no sense in wasting their time. Just guess it would have been a coincidence if something JUST started rubbing?
 
Who gives a schick you *^^%^% killed the cat!
Burn that dang swooopy ***** piece of korean car to the ground!

Really Sounds like you engine has poor cylinder balance which may be caused by one cam bank not degreed in or a moron tuneup.

Morn the cat. Beepp the horn first befgore startying - i love waking up my moron neighbors who leave there cars out all nigh by laying on the horn at 545AM every day.
 
I suspect the cat died of heat exhaustion in the passenger compartment but this is too grisly an aside.
 
Originally Posted By: eljefino
I suspect the cat died of heat exhaustion in the passenger compartment but this is too grisly an aside.


No, nothing like that, or else I wouldn't be driving the car! Cat got caught in the plastic under the engine. By the time she got out of there, I would halfway down our road and she fell out and landed in front of the back tire.
 
Well, unbeknownst to me, the wife just called and asked what it is doing, as she had time real quick to run it up there. Will update everyone with what they say, as this vibration/buzz is driving me nuts.
 
Not sure if anyone is following this one, but I figured I would give a quick update.

The shop took all of the pulleys, tensioners, etc off and put them back on making sure they were sitting properly. The truck sat all weekend, and once they did that they vibration was “gone”. I went and picked it up, and drove it around, and quickly noticed the vibration wasn’t gone.

Now that I am the full time driver and not test driving after the wife gets home, I find out that the vibration isn’t there first thing in the morning, and doesn’t show up until the truck is at temperature. It also isn’t there when the AC is on.

I have found a few items that needed tightening, but that wasn’t the issue. It will probably take me some time little by little looking for the culprit, but so far I haven’t found it.
 
Engine driven fan or electric? Bad fan clutch can cause a funny variable vibe, disregard if electric.

My gut says motor mounts, easy to check out.

Good luck, diagnosis is always the hard part...
 
It is a mechanical driven fan. The motor mounts look ok, and the engine has little movement when revved in forward or reverse. Anything else I should try to check them?
 
Maybe this is a stretch, but I have noticed that one of the bolts holding the fan on must have been misplaced, as there is one different bolt. Is it possible that this bolt is enough weight difference to cause an issue, or am I just stretching for an answer?
 
unless the difference is HUGE their should not be a problem.

But the entire fan assembly is highly suspect. Some are thermostatic, some are centrifugal only. Do you know which kind you are running?
 
I guess being a drive-by-wire throttle, I have trouble imagining vibes through the pedal at all. If I were to get an automotive stethoscope, would I be able to hear any difference in frequency in the motor mounts and fan clutch (assuming I could get close enough safely) when the vibe starts?
 
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