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Engine knock? Differential Noise?

hbv2020

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I have the 3.8 engine and it seems that under light acceleration the engine almost knocks. It seems as if the the spark is advanced to a point just short of a knock. I plan to use premium fuel next tank and see if it changes.

Also, has anyone hear differential noises? I have trouble deciding whether it is the tires or a differential whine when decelarating about 40MPH.
 
I have 3.8 also and mine is smooth as silk always. I don't have any whining at all. Also, I have used regular gas from day one and have not had one problem with any weird engine noise. Might be time for a trip to the dealer
 
I have the 3.8 engine and it seems that under light acceleration the engine almost knocks. It seems as if the the spark is advanced to a point just short of a knock. I plan to use premium fuel next tank and see if it changes.

Also, has anyone hear differential noises? I have trouble deciding whether it is the tires or a differential whine when decelarating about 40MPH.

I started hearing a very quiet whining noise coming from the rear of the car at between 40 to 60 MPH about two months ago. I too like you had trouble trying to figure out what it was. I eventually did some research and listened very closely under many conditions and came to the conclusion it was the differential. I had my wife and brother sit in with me on a number of occassions and they could not pick out the noise as it is very faint and only when lightly tapping the gas pedal at speed. I was starting to think I had dog hearing.

Last week I took it into the dealer and told them I suspected the differential. They had a look and confirmed the differential is making some noise that it should not be making. They will be swapping out the differential assembly Feb 11 under warranty. And for those whining about their Hyundai Dealers...... mine is giving me a loaner car for the day and will have it fixed within two weeks of me bringing it in including time to order the part .... with no hassles or trying to talk there way out of it.

Do yourself a favor and bring it in to your dealer and have them look at it.
 
I was pleased to hear I'm not the only one with differential noise. Mine is most noticeable when decelerating from 40 to 50 mph down to maybe 10 mph. I'll take it in.

In addition, my car makes more noise accelerating than when I bought it but I don't think it is engine knock. I think I read that their is a noise reduction valve associated with the engine and I'm beginning to think that is the issue. I've had no pre-ignition knock that would come with the wrong octane fuel or incorrect timing.
 
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I was pleased to hear I'm not the only one with differential noise. Mine is most noticeable when decelerating from 40 to 50 mph down to maybe 10 mph. I'll take it in.

In addition, my car makes more noise accelerating than when I bought it but I don't think it is engine knock. I think I read that their is a noise reduction valve associated with the engine and I'm beginning to think that is the issue. I've had no pre-ignition knock that would come with the wrong octane fuel or incorrect timing.

I am experiencing the SSSSSSAAAAAAAMMMEEEEE thing, i just took it to the dealership and the guys told me it's normal. I said it can't be normal engine noise as it's been getting worse since i got the car. I told him about the noise from the tire as well and he said it's normal snow tire noise (I'm beginning to think this guy has stock in NORMAL) I am not going back to that dealership anymore, my next scheduled maintenance i will go to another dealership. What exactly was the issue with the engine and the differential so i can tell the techs at the new dealership
 
Well........ IT'S FIXED !!! ........ Dealer replaced the Differential assembly and the noise is gone......

Note that from the research I have done, the differential noise is normally noticed between 40 and 60 MPH and only when applying load while tapping on the gas......

It took them about three hours to make the repairs

I will say this ..... any noise that your hearing now that you didn't hear before is not "normal"
 
There is a TSB to cover the rear drive shaft noise. If your dealer claims it is normal, you should show them the information below. I have not experience the noise on my Genesis, even though it was manufactured during the TSB applicable production dates.

Group: CHASSIS
TSB Number: 09-SS-002
Date: AUGUST, 2009
Model: GENESIS SEDAN (BH)
Subject: REAR HUB AND DRIVE SHAFT ISOLATION WASHER INSTALLATION PROCEDURE

DESCRIPTION: Some vehicles may exhibit a driveshaft “snap” noise when the vehicle is driven in forward or reverse. This bulletin provides instructions on installation of a washer between the rear hub and the driveshaft (both sides) to repair this condition.

APPLICABLE VEHICLES:
  • Model: GENESIS SEDAN (BH) (4.6L and 3.8L Engines)
  • 4.6L Engine Model Year: SOP 2009 to Feb 16, 2009
  • 3.8L Engine Model Year: SOP 2009 to May 12, 2009

WARRANTY INFORMATION:

OP CODE: 51755F00
OPERATION: REAR HUB BEARING WASHER ADDITION
OP TIME: 1.3 M/H
CAUSAL P/N: 52730-3M000
NATURE: N29
CAUSE: C24
 
I have the 3.8 engine and it seems that under light acceleration the engine almost knocks. It seems as if the the spark is advanced to a point just short of a knock. I plan to use premium fuel next tank and see if it changes.

Also, has anyone hear differential noises? I have trouble deciding whether it is the tires or a differential whine when decelarating about 40MPH.

If the noise you are hearing is during DECELERATION I would suggest it is likely not the differential...... it's probably something else......
 
If the noise you are hearing is during DECELERATION I would suggest it is likely not the differential...... it's probably something else......
From what others have described, the noise seems to be prevalent at a certain speed (about 45-50 mph from what I recall in other posts), regardless of whether someone is accelerating through that speed, decelerating through that speed, or maintaining that constant speed.

I would think the noise might be more noticeable during declaration since the differential noise would rise above the engine noise in that case (as the engine rpm is lower during deceleration), but that is just a guess.
 
I'm a newbie here and posted a similar query a few moments ago about engine noise. What I hear on light acceleration is a burbling noice that, on slightly harder accelration, has a kind of "rock-rock-rock-rock" sound that is surprisingly "edgy" for a luxury car. Quite unlike the turbine-like sound my Accord 6 made on acceleration. It might be normal -- it sounds something like the sounds made by some V8 engines I drove in my youth, but I'm surprised how audible it is accelerating from a stop on a quiet country road.

--Jim

I have the 3.8 engine and it seems that under light acceleration the engine almost knocks. It seems as if the the spark is advanced to a point just short of a knock. I plan to use premium fuel next tank and see if it changes.

Also, has anyone hear differential noises? I have trouble deciding whether it is the tires or a differential whine when decelarating about 40MPH.
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What you guys are describing as your rear differential noise sounds like a "pinion whine."
I am familiar with this on really older cars and have not come accross it in ages. It is not minor and the differential would certainly need to be replaced. If this car has such a quiet interior, I'm surprised more owners have not noticed it, unless everyone drives with the radios blasting. I believe the V8 uses different gear ratios for the rear and may not have these issues. For more info, just google "ring and pinion whine".
 
There is at times a sound coming from back three- some sort of whine- but lower in frequency. Goes away after letting up on the accelerator. Thought it was either differential or even fuel pump.
 
JimInNashville

I would be interested in your comparison of the Accord and the Genny.
 
GripperDon,

My 2003 Accord with the 240hp V6 was a superb car. It was totaled when a texting teenager rear-ended me at 35mph while I was stopped on a dead straightaway behind a "Nervous Nellie" who needed a big break in traffic to make an easy left turn. She had about 5 easy opportunities in this driving rainstorm before she finally made her turn. Just as she turned, I saw these lights bearing down on me from behind and gripped my steering wheel. The kid barely hit his brakes before creaming me, totally crushing the back end of the Accord. I walked away dazed and amazed. The car was a writeoff.

Anyway, the Accord had about 45000 miles on it, and was completely trouble-free for the entire 6.5 years I owned it. Replaced tires at 32000, battery at 40000, still had original brake lining.

Excellent performing car, very refined, turbine like engine got the car from 0 to 60 in about 7 seconds flat, averaged roughly 22 mpg. Not great road holding, I'd say about
.78g. Very nice solidity and integrity. Still not one squeak or rattle after 6.5 years of driving. Still not burning any detectable oil between changes. (I changed each 6 months, after about 3500 miles of driving).

I paid 21300 for the Accord, and State Farm gave me 13400 for the wreck. So you can see my cost of ownership was incredibly low.

The Genny seems much more solid than the Accord. Doors and trunk lid seem much heavier, and more solid. Paint quality is noticeably better, absolutely beautiful. 6 speed tranny is fine, although it gets a bit confused if I stomp the accelerator really hard, then back off really fast.

The combination of road holding (much better than the Accord) and great low end torque in the Genny V6 gets me up to entrance speed with far less gas and RPMs than the Accord. With the Accord's poorer road holding, I'd have to hold back on the curved part of the ramp, then wind it out on the straightaway. With the Genny, I just rev to about 2200RPM and it easily exits the curved part at 60, then pulls right up to 75 at the entry point to the highway. The result is my morning commute is an effortless, relaxed experience that is almost Zen like.

Did not subscribe to XM Radio. Their deceptive billing practices (hidden $24 a year "royalty charges" that should be declared up front) and bad reputation, plus the fact that I'm only behind the wheel an hour a day and don't like to drive distracted turned me off. (after 6 years, you've saved a thousand bucks, assuming they have not gone bankrupt by then).

Ride is a bit strange (lurchy) at times, but very solid, and I actually like it.

Climate control is excellent. Braking superb.

Stock tires don't grip well on snow and ice. Better go really easy, or else stay off the road entirely.

Engine/exhaust noise (kind of raspy, metallic warble on acceleration), as I have said before on this forum, is the one most distinctive negative trait. It just doesn't sound right to me. Neither luxurious nor sporty.

Overall, the Hyundai seems to be a much better car than the 2003 Accord. I drove a top of the line 2010 Accord V6 before test driving the 2010 Hyundai. The 2010 Accord is smaller than the Genny, noticeably slower than the 2003 Accord (and of course not competitive at all with the Genny). It is substantially smaller on the inside, slightly smaller on the outside, and although it feels more substantial and solid than the 2003 Accord, it is no match for the Genny. I paid about $4500 more for my base Genny 6 than I would have paid for the Accord. I got an extra two years of warranty, and so far the Genny is getting better gas mileage than my 2003 Accord. (And it is well known that the 2010 Accord gets poorer mileage than previous generations, despite its use of cylinder-cutoff technology that drops you to 4 cylinders during highway cruising -- with a slight shudder I actually could detect).

Frankly, I don't know how Hyundai does it, and I am waiting to discover some horrible flaw in the Genesis. But after 3.5 months and 2000 miles, I have not been able to discover any serious flaws in the car.
 
Alternate fix

Well........ IT'S FIXED !!! ........ Dealer replaced the Differential assembly and the noise is gone......

Thought it was: DIFFERENTIAL
For me it was: FUEL PUMP

I had the same problem everyone is having here. Low-Medium pitched whine coming from the general direction of the rear differential. Would go away as I was accelerating and reappear when I took the foot off the gas. I also had some slight vibration in the rear seat as this was happening.

Service advisor said he could hear and feel exactly what I was experiencing but couldn't find anything wrong with the differential or couldn't detect any extraneous sounds coming from it. Based on the information on this board I kept telling him it was the differential but he kept saying that they checked it. Another 30min passes by and they say the finally found where the noise was coming from: THE FUEL PUMP

It was functioning but it appeared the pressure was being backed up (He wasn't exactly sure what was going on). He replaced the fuel pump and all the noise went away. Car is perfect again.

I'm not implying the noises the other guys were experiencing were not coming from the differential. I'm just saying my noise was coming from the fuel pump.
 
I took my car in and they said it was tire noise. No gear or differential noise. I'm skeptical but will be replacing the tires shortly and then we'll see. ron
 
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