wjmb
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Just moved cross country (CA to MD) in my 08 Sport. Here are some observations:
- exceedingly comfortable, great handling
- XM sound quality still sucks (old news) except for talk radio like ESPN
- had over 500 lbs of "stuff" and still had plenty of power on I-70
- computer said I got 24.5 mpg
- had signs of front rotor warpage on I-70 after multiple brake applications because interstate drivers in our country still suck
- got a P2422 check emissions light (EVAP) on last day of driving
A little worried about the rotors as this would be my first Honda to have brake problems (owned a 98 Civic, 01 S2k). Going in today for my EVAP code.
Overall, though, this is best "wagon" out there and it looks cool... I didn't see too many on my journey, also. Oh, and hybrids with no power should be banned from interstates.
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Grace141
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Any chance your CEL turned on after filling the gas tank completely and then driving up into some mountains changing elevation several thousand feet? Happened to me west of Denver in my Accord. I removed the gas cap to check it, put it back in its place, and a day later the light turned off never to come on again.
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6SPDTL
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BTW just info. Rotors dont warp. The symptoms of "warp" are due to uneven deposition of brake pad material on the rotor. A very superficial resurfacing should cure it fine. BTW you are the first instance of this issue on an MDX I've heard. Have you had a couple of instances of very heavy brake application, like sudden stops from high speeds or overheating from extended heavy use?
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wjmb
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I can answer both posts from above:
1) Don't think I got bad gas, and the suspect fill-up was a couple of days after the real mountains... got gas in Lexington, KY and then hit the hills on I-64. So, there were some rapid elevation changes, but nothing like Colorado. Light stayed on for quite a while and I've been driving for a few days in Southern Maryland where it remained on. No word from Criswell Acura service yet...
2) I actually didn't know that about rotors (my long gone Merc Mystique was supposedly notorious for warpage due to over-torqued lugs), so I feel old and dumb now. Yeah, I had a few repeated heavy brake apps down the mountains on I-70 ranging from slow speed all the way up to the 80's. Ever since, they were smooth, so maybe they got cleaned off in normal driving?
Got a loaner TSX V-6 for the day. Very fun ride; now I wish that combo was going to be in the upcoming wagon.
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6SPDTL
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I just sound smart since I learned the warp thing a few mths ago ;).
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garoto628
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6SPDTL wrote:
I just sound smart since I learned the warp thing a few mths ago ;).
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hahahah! well my "warp" cases in my 2006 civic si have been due to extremely heavy braking on cold rotors/pads. This happens due to sudden braking in the first few feet due to kids popping out of nowhere around where I live (even main streets unfortunately, due to school hours). And other miscellaneous sudden traffic stops.
Anyhow, the few times that I've had to brake hard in cold pads/rotors this has happened and cured itself after a few hundred miles of driving. They are not really "warps" as in the rotor got cut, it is more like "some additional break pad material got stuck to the rotor".
Just my interpretation of it.
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Hondu
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6SPDTL wrote:
BTW just info. Rotors dont warp. The symptoms of "warp" are due to uneven deposition of brake pad material on the rotor. A very superficial resurfacing should cure it fine. BTW you are the first instance of this issue on an MDX I've heard. Have you had a couple of instances of very heavy brake application, like sudden stops from high speeds or overheating from extended heavy use?
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Actually rotors can warp and it is due to physics. They are normally made from Cast Iron, and poor cooling in the molds after casting will cause too much retained austenite in the microstructure of the rotor, mixed with martensite.
When this austenite "reverts" to martensite from pressure of the brake pads and/or cooler temperatures, the rotor will warp due to a volume change associated with the microstructural transformation. So, unless the manufacturer is making retained austenite "free" rotors (better cooling/heat treating/etc.) rotors can still warp.
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classicAccord
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True, but the most common cause of warpage is overtorque by using impacts on lugnuts. The local stresses under the lugnuts cause uneven expansion and contraction when the rotors are heat loaded.
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wjmb
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Allright, well, at any rate they didn't find any rotor issues, so I probably had build up during the "spirited" driving. Guess I better not take the MDX on the "One Lap of America."
EVAP canister valve is on order... first time I had to bring in a Honda for a repair after only 34k, but at least it's not anything remotely close to stranding me on the side of the road.
I might have to keep the TSX loaner... the paddle shifters and V-6 are pretty fun.
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