diff noise while coasting??

[phines]

Brian,
My front diff had to be replaced too. The plastic nozzle that the vent hose attaches to had broken off... as a result, water from my off-road adventures got in the differential and rusted it out from inside. You might want to make sure that hasn't been broken on yours too. If you don't know what I'm talking about, it's located on the top towards the driver's side axle.

That is probably something everyone should check who does any off-roading. You can fix it for a couple dollars and it'll save you hundreds in the end.
________
HERBALAIRE VAPORIZER REVIEW

[yal^]

Well, it didn't go so good in my case.
After I got through the service desk a**hole (excuse my language), mechanic decided my tires are making the noise!!! I waited for 1.5h just to have the same prick come out and lecture me on the size of the tires and telling me they might void my warranty because the tires and wheels are not stock
I protested the treatment and demanded mechanic take a ride with me.
He drove. First he was trying to tell me that all he hears is my tires and howling rack - I took off the fairing for a while.
And then the noise kicked in. He looked at the gauges, looked at me, then at the gauges again. Then he played with it for a while, very unhappy knowing I was right and he looks pretty bad right now. Finally he sold me a story that this is all wheel drive car, and is designed for the stock tires ONLY! and I should not put any oversized tires on it, ‘cuz I am tampering with drive train. If it was a Trooper, where you have a switch and can go back and forth all wheel-2WD, then you can put oversized tires on. TOD will not work properly with heavy tires, and that's why my problems occured

I was silent for a good while...

Then of course there was the whole thing about springs - why are they so big. So I played stupid this time. I told him my stock springs were sagging, so I put those on, thinking they would be better, but I did not do any further modification to my suspension. Besides springs are not covered under warranty, so I didn't think Isuzu would mind...

They bought it.

I took my baby home, exhausted and unhappy. It's still grinding somewhere, all the remedy I got was "put your stock wheels back on and see if that helps"
Next time I think I am going to shave my head, grow a beard and get a few tattoos. Maybe then service department can admit openly to me, they have no idea what they are doing

[SGT.BATGUANO]

BBVX,

You posted about noise in front. Now you say you're getting a new REAR diff?

Some info the lifters might find helpful. I've previously posted that when I got my Proton, it had 912's in the rear and was lifted to be level. That is BAD because.......

1) the VX has a factory rake, the front is between 1.5 and 2 inches lower than the rear.

- If you don't maintain the rake you whack the alignment.


2) Leveling with 912's in back equates to approximately a 4 to 4.5 lift on the front, which will cause serious stress on all the front diff components. You're CV's will be approaching a 45 degree angle. Even the CV boots don't like this and might tear, let in road gunk and destroy your CV's ....ask Proton Smoke (3 inch lift), he paid about $1700 to have ONE side replaced!

Another AWOL member,"Big Meat VX", advised dropping the front axle 1/2 inch per 1 inch of lift if you go more than 2 inches.


If you lift, do it in moderation.


Yal,

If it only happens in a certain gear, it's probably NOT your engine.

Check what RPM and gear it occurs at. Then, hold it in any gear and bring it to that RPM If it doesn't happen in all gears at the same RPM. That should eliminate the engine.

P.S. When testing, don't hold it at hi RPM's (over 3000 RPM) in any gear for a long time.

EX: 1st gear @ 5500 RPM for >10 seconds

Next, note what speed(s) the noise is present, get the vx into that range and take your foot off the gas and shift into neutral. Your RPMs will dropand if the noise drops with the engine RPMs then it's engine related. If the noise drops with the VX's speed in neutral, then it's driveline related.

[BBVX]

Yeah, I just assumed it was coming from the front because they already replaced the front diff, and I figured they just didn't set it up right. Although, I did lower my front end about 2" before I took it to the dealer, just to check if it was the CVs, and it made the exact same noise at the exact same times.
I definitely agree with you about the angle of the axles, and I have already flipped the ball joints. I also sent Allan (BigMeatVX) a check for his extra set of axle brackets, so I could lower my front end, but I haven't heard from him. He's AWOL?? What's the story??

Thanks,
Brian

[SGT.BATGUANO]

Awol or MIA, just haven't heard anything from him for quite a while. Hope he's ok.

[yal^]

Mike: so I dropped it to neutral like you told me, on a long stretch road, at about 50mph, after I brought it to almost 25000rpm.
It started dropping gears immediately, like you said it will, and (I think, I am very mechanically challenged) right before it dropped from third to second I got this noise come on again, very briefly, but it was definitely there. When it got below 1800rpm it was smooth, and not interrupted. I brought it to a full stop before shifting back to drive...
I do not know if it means anything and I do not want to experiment with it anymore, since "engine behavioral" is absolutely not known to me. I'd rather have someone else to check it for me. Any volunteers? LOL

[AnalogVX]

...wanna go for a ride?

[yal^]

Just tell me when...

[Bobster]

Problem solved ! The tranny noise while coasting was due to a slow leak in my right front tire. The tire was repaired and inflated. The noise is completely gone. BTW I did see flaking inside the rim. Got an appt Monday with the dealer to see how many replacement rims they need to order.

[Anita]

Originally posted by Bobster
Problem solved ! The tranny noise while coasting was due to a slow leak in my right front tire. The tire was repaired and inflated. The noise is completely gone. BTW I did see flaking inside the rim. Got an appt Monday with the dealer to see how many replacement rims they need to order.

Ditto on this. I had the same whining noise while coasting. Prepared myself for the worst and began reading this thread. I remembered noticing that my right front tire seemed low on air yesterday so first thing today I would check air pressure and fill if necessary. This morning I walked to the truck only to notice the tire was flat! Got my neighbor to pull my full spare out of my basement and Auto Club did the rest. Now no more whining.. at least from the VX. ;Dr;

[Narsus]

I have this same grinding noise on my 2001 STOCK vehicross. It only started about 2 months ago, and I'm looking at about 36,000 on the odo right now.

This is one of two problems that recently started happening. I let off of the accelerator anywhere from 70-15 miles per hour and it's loud enough for me to hear it over the stereo (which is pretty darn loud). I'm definitely going to take it into the dealership in my copious spare time. I'll post what they find out.

The 2nd problem is a very large hiccup when I'm in 2nd gear and going into 3rd at about 30mph. The tranny makes a big BUMP noise and the VX jerks a little more than I'm comfortable with. Does anyone have any idea what I should suggests to the Isuzu dealership, since our Isuzu shops here in Denver pretty much suck.

[Narsus]

Okay, I posted before I read that last post. I'm a moron. My right front tire was really low, and I filled it up this morning. It was down to like 15psi, so I'm assuming a slow leak. I'll post what I find out, but still go to the dealership for the BUMP.

[Anita]

Narcus,

I bet it's due to the low tire.

Your second problem sounds a lot like the Mode Switch. When it starts to go out it really bangs changing gears.

[PeteVX]

OK so i posted on this thread a while ago about my diff noise at 62-65mph, i then posted again somewhere else about an unpleasant experience with Isuzu HQ and their condescending attitude.

Well, i finally took it into the dealer a week ago, they were great!! First the shop manager went for a drive with me, confirmed the noise, said it was the diff (he could actually hear it slowing down or coasting too which i couldn't)

They took the car in a couple of days later, stripped the diff down but when the parts arrived the next morning there was something missing so they rebuilt the diff again so i could have my car back, were very apologetic and said they would take it back in again when the parts arrived. Talk about a completely the opposite of dealing with isuzu HQ.

Everything will be covered under warranty....GREAT!!!!!

I mentioned to the shop manager about ISUZU HQ, he said it might be to do with isuzu cutting back US operations, they have sold their assembly plant which they apparently shared with Subaru, the only vehicle they will now sell is a car which they have built for them by someone else. There have been some rumours about money problems or restructuring and coming back in a few years. But his biggest concern was they would lose customer loyalty which has taken years to build up, especialy whilst they have been getting great reviews for their small SUV for a few years now and has been selling really well.

Isuzu are apparently still strong in europe and asia, its just a US thing.

Anyone????

[VR4-Quest]

BBVX, so what is the common problem with the rear axle, what was wrong? Is your VX lifted?
PeteVX, is yours lifted?
Mine never made the noise till I lifted it.............and I do have an extended warranty but feel the dealer wont cover it becuase of the OME912 spings, unless I play stupid.......