Do you mean the green ECO light? Is this also true in the Ody then? I haven't noticed anything like that - maybe when I'm on the highway, there is a very slight resonance which I assume is the VCM kicking in.For the pilot they light seems to be tied directly to VCM. As soon as the light comes on you feel the vibrations. Now no light and no vibrations.
OK, now this is being really anal, but here is what I take from that explanation:In my pilot it was simple. My pilot like others, experienced vibrations when VCM was active in cold weather. For the pilot they light seems to be tied directly to VCM. As soon as the light comes on you feel the vibrations. Now no light and no vibrations. To be clear, when your engine drops cylinders, the engine starts to vibrate and make noise. The Honda active engine mounts and active noise cancellation through your speakers just masks it so you can't feel it. On the pilot the front propeller shaft would vibrate so you could actually feel it.
Honda came out with TSB for pilots and Acura RDX to fix the problem and it's helped but not been totally eradicated. With the mod there is no more VCM for sure.
I'm remembering back to the late 80's, specifically GM's midsize passenger cars. Got pretty decent highway mileage comparatively speaking. Because GM put a 'lean highway' mode in the programming. Requirements were something along the lines of closed loop, above 50MPH, warm engine, steady throttle, and 15 seconds of steady-ish manifold pressure. O2 would swing fairly lean, then ease back to stoich, swing lean, ease back to stoich...as long as all those conditions were met for 15-ish seconds. The only purpose I can think of is to weed out ratty data.I haven't been able to detect anything like what you describe. VCM seems to activate instantaneously when the Engine Coolant Temperature as reported by ECT1 reaches 167 degrees. Once it is active, it doesn't stop activating (under the appropriate conditions of course) until the temperature drops back down to about 162-163 degrees. I'm not saying there isn't some sort of time lapse, I just haven't been able to detect one and I'm not sure what the purpose of a time delay would be in the algorithm if all other conditions are properly met.
There may be doubt in your mind but there's no doubt in mine. Anyone that has experienced VCM vibrations knows exactly what it is and why it happens. The engine goes unbalanced when it drops cylinders. That's why they use the active engine mounts and noise cancellation. I drove it half the winter with VCM vibrations and EVERY time the vibrations started, it coincided exactly with the ECO light. The ECO light was never on without there being vibrations. Honda acknowledged the vibrations were due to VCM it in their TSB as well as Acura's TSB.OK, now this is being really anal, but here is what I take from that explanation:
On your Pilot, there are 2 indications (let's call them "symptoms") that the VCM is active: the ECO light and the vibrations. After the mod, both symptoms were eliminated. No ECO light, no vibrations. From a purely scientific perspective, all we know is that your resistor altered a signal to the computer, causing it to do something different which resulted in both symptoms being eliminated.
Now, I'm not saying that your mod didn't disable the VCM, but I don't know with 100% certainty that it did. All I know is that the 2 symptoms of VCM activation went away and that your milage changed by 1 MPG (which could be noise).
Is there any way of actually monitoring all three cylinders with and without the mod and showing beyond a shadow of a doubt that all three cylinders shut down without the mod and that all three cylinders never shut down, never changed their timing, never changed at all, with the mod?
In other words, the elimination of the symptoms makes us assume the disease has been cured, but we haven't really looked for the elimination of the actual disease itself. Cancer has been known to fool doctors into thinking it was eliminated because of the lack of symptoms, when it reality all it did was alter itself without really going away.
I do wish I had more data to know for sure what temp the engine can get to when idling in traffic in Death Valley. I'm hoping the cooling system is efficient enough not to let it go too high above normal.Everything I've read in your threads so far sounds like it's a smashing success. I think the real test is what happens when you go through stop and go traffic in mid August in Arizona or somewhere where the outside air temps can get to 110+ degrees. Will it affect drivability or cooling ability of the vehicle then? That's the scenario I'd like more feedback or comments on.
I'm just curious if that ECT1 reading does anything else besides signal VCM to activate at temp. I would think that reading would be used for something else besides VCM and whatever it affects may not be visible until ambient temps get really high. Any ideas?
A honda tech bought one from me already.Hopefully the guy that's a Honda tech will chime in here soon. For me, the fact that this appears to be working is good enough reason for me to lay some a few bucks and try it out. I've got none of the vibration symptoms that have been an issue for some of you but even so, I know that it has had some effect on the engine already. When I changed out my plugs at 59k kms, the rear one closest to the drivers side had a tip that was much shorter and worn / oily than all the others. Rear bank plugs definitely looked a little 'wet' compared to fronts which were dry.
I suppose one way to check (but it would require time and some investment) would be to change the rear bank spark plugs and drive it with this mod installed. Then after a specified period of time, pull them and see if they look 'wet'. If they are 'dry' you could make a correlation that the mod appears to have had a positive effect on the plugs and that this *could be* because of the VCM being disabled.
I don't believe the ECU will demand a rich situation for very long past startup. At just 15 degrees below normal operating temp, I highly doubt that it would be dumping fuel into the cylinders. I've seen no excessive fuel consumption either, just what you would expect without VCM.ASFAIK, the ECO light and VCM are not related. They are closely coupled as VCM would be on while in ECO mode mostly but they are distinct. To play a devil's advocate, the fact that ECO is not turning on is a tell tale giveaway that the resistor indeed is sending a not-warmed up voltage to the PCM. I don't know what is better, running with the PCM thinking the vehicle is not warmed up or running VCM. There are several long term carbon related issues with running rich which is what the vehicle runs when not warmed up.
On the pilot, disabling the VCM with CEL on also disables VTM-4 as well. Others report it also disables VSA. One major drawback of this that most seem to forget is that with the CEL on constantly, you have no clue if something else goes wrong because the CEL is already on... or you may miss it. you can check regularly with an OBD tool, but you might be too late if it's serious.If given a choice, I would disable the VCM with the CEL light ON way as that should only impact the VCM. Yes. The ECO light does not come on in that case as well but that is because of the CEL being on. At least we know for a fact the car won't be running rich in that scenario.
I would not offer what I have for the older generation for two reasons. 1. the connector is different and I'd have to order some in. 2. It hasn't been tested like you say. I believe I said that in another post?OP's Pilot is a 2012 model. Which has the VCM2 system. We in the 3rd gen have both VCM (2005 - 2007) and VCM2 (2008 - 2010) depending on the model year. So, more testing would be needed for the older VCM system.
Oh, and as far as when you can buy one goes, they're on sale now, but I'm not allowed to post a classified here yet, and presumably nothing about selling on regular threads. I think it's ok to say you can just PM me though.Again just curious - how did you arrive at this value? Was it trial and error? I'm just wondering what the range of resistors was because it would be interesting to see your research in terms of how you got there. And when can I buy one?