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Sedans Honda Accord Honda Accord VCM
2139 messages, Last post on Jun 30, 2009 at 6:15 PM
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| Just picked up my new 08 Accord EXL-V6 with Navi etc Sat. This is my 6th Accord. Ok so I get the whole "gogreenloweremissionssavefuel gig". But here is what noone is talking about yet and so far, I appear to be the first..... VCM (Variable Cylinder Management) Hondas new generation engine for the Accord is different then engine they have been using in the Odyssey. Ya see in the Van version Honda implemented a 6 cylinder to 3 cylinder VCM function. in the 08 Accords its 6-4-3. The issue is this... when you are in the city you will rarely notice anything, maybe when the "ECO" light comes on you may feel a slight hesitation a 1/2 second after but, overall with all the stopping and starting etc you cant seem to notice anything out of the ordinary. Ok so here is the rub,,, take it out on the highway and run the car at about 65-70 miles per hour (normal within the speed limit) cruising and you will begin to feel the VCM system trying to figure out what it wants to be when it grows up... you "may" feel the car surging and slight hints of hesitation as it jumps from 6-4-3 cylinders.. those of you that like to feel the road and are "in tune" with your ride "may" just get frustrated. Add on top of that the new "Grade-Logic" system and what you end up with is a a car that can (at times), feel like its trying to get into gear (at least mine anyway). This seems to be minimized when in "cruise control". I found this hesitation and/or surging felling no matter how stable I kept my foot on the gas, even going so far as to lock my ankle in one position thinking the gas pedal may just be super sensitive. I took it into the dealer today and they ran about every computer test they had on it and all was ok (or at least within specs). in fact we road tested two other V6's and sure enough... same drill. So caveat emptor (buyer beware) the car is awesome in almost every respect BUT just be sure that you know what you're buying and how it operates. It is different than your run of the mill V6 engine. Yes its a new technology and yes I drove a standard V6 for years, so I need to get used to this, and (of course) I am sure I will, ( well a pray I will after dropping $30K)... but if you are concerned that yours is having issues or that it is not running correctly... it most likely is (as designed). My salesman had me believe that the only thing you I would notice is the "ECO" light coming on and that just isn't the case in my experience. | |
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Replying to: golfrski (Nov 01, 2007 6:42 pm) |
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Noted the two above posts re operation of the VCM (3,4,6 cylinder operation) on the 08 Honda V6. I too own an 08 EXL V6 non nav model. Now have about 3,800 miles on it, including an 1,800 mile highway trip. Unlike the above users, I do not find the cylinder change objectionable. I do agree that you can "feel" it, especially if you are watching the "ecomomy" light. What I experienced, however, on the highway was I thought a rather pleasant addition of power when going up grades. On cruise control, I noted that as grades were encountered, it switched to 6 cylinder operation with a slight increase in power, much like a downshift. A side benefit is that unless the grade is pretty steep, the transmission DOES NOT downshift as with most cars. (You can observe this by the rock steady RPM). The engine does run at relatively high RPM vs other V6's (my 07 Toyota RAV4 for instance), but probably due to this higher RPM and the ability to engage more cylinders, it does very little shifting at speed limits.
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Replying to: leroym (Nov 02, 2007 6:33 am)
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Replying to: golfrski (Nov 01, 2007 6:42 pm) On one of the non-Edmunds 2008 Accord forums, several posters have become alarmed because a few almost new 2008 EX-L V-6's with 1000 miles or less have been immediately put up for sale by private owners. Nobody knows why... could be because of what you described. I have yet to drive the 2008 EX-L V6. The car is on my list. I would insist on driving it on the interstate to see if I can duplicate what you describe. Coming from three BMW's, that would definitely bother me. None of the reviews I have read indicate the VCM problem. Disappointing.
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Replying to: dpmeersman (Nov 02, 2007 6:44 am) |
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| Let me clarify that I don't feel the VCM issues (at this point) are objectionable. I do feel that the marketing of the engine is vague.. you can definitely feel the changes in cylinders when driving on the highway.. without question its there. Based on the Honda Service Managers opinion "it almost can feel like a 5 speed in overdrive". I don't find the "feeling" to be as aggressive as shifting gears by any stretch but I do feel constant changes in the engine's consistency when driving at 65-70 mph. hesitations and or surges can be felt and are present in the operation on my car. Again, I had this thoroughly inspected and the dealer says it is operating "within spec" so... do I think I will learn to live with it? Yes of course. The car is awesome in every respect but that.. the design is sharp, it gets alot of stares, the hints of the BMW are great in this car. It does indeed ride like a 40-50K automobile. I would by lying if I did not say that I am disappointed in the transparency of the VCM operation and hope that Honda many come out with a tuning process or improvement for the 08's and future vehicles to lessen this inconsistency. | |
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Replying to: leroym (Nov 02, 2007 6:33 am) |
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that mentions the VCM in the 2008 Accord EX V-6 sedan states that the VCM is totally unnoticeable to the driver except for the indicator light. Must be at least 10 reviews saying the same thing. One reviewer called the VCM's operation "seamless." This is the first time I have heard anything to the contrary. On the other hand, there seems to be a consensus of unhappiness with the performance of the 5 speed automatic transmission. |
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Although the reviewers often say the VCM's operation is seamless, I have seen a number of posts over the last month which have mentioned feeling the system operate. None have said it is overly-objectionable . . . just that they feel it. I think this is consistent with golfrski's post. With regard to the 5 speed auto tranny, I do not believe there is a "consensus of unhappiness" with its performance. It gets glowing reviews from the pros and gets a glowing review from me  . I was dead-set against an automatic when I purchased my 4cyl EX-L. But, after several long test drives and the unavailablity of a manual, I bought the auto. I have not regretted my decision! The automatic is still no manual in terms of control, but I think it does a wonderful job for an automatic. Its upshifts are smooth and, most importantly, predictable and its downshifts are right on the mark. The system is smooth (and I hear even more smooth when mated to the V6) and never searches for gears. If there is one thing I would go to bat for on the new Accord, its the automatic transmission. I think it does a superior job of reading my right foot!!
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