12/17/2023 0 Comments P2646 honda elementWhile doing this I saw the screen was pretty badly blocked so I cleaned that. I followed everyone's advice and replaced the switch. Story: Car started missing/falling on it's face under load. I just went through this same issue and here's my story and theory. Once again the "What is most likely wrong?" approach seems to have saved me some $$$. Thanks to all who posted amazing tips, perspectives and advice on this one. I'll admit that I ran it a bit longer (6,000-8,000) between oil changes and someone suggested that may be a contributing factor in this. I have used synthetic (Royal Purple then Mobil 1) for the 40,000 I've owned the car (so did prior owner). I was surprised how easy it was to get at.the tip of removing the right front wheel was essential (and I did my serp belt at the same time). The local Honda dealer's price was not a lot higher than having it shipped in 2nd day air. I test drove it tonight and it seems to be all better now. I changed the oil (but wasn't hopeful) and when that didn't work, I replaced the whole VTEC solenoid assembly (which includes the pressure switch). It seemed to do better once it was warmed up.Īt one point, I did have P2649 as well. I had Code was P2647 at about 95,000 miles and I hoped it was just low oil (I did add 1 qt, which seemed to help briefly but the light remained on) and would often (but not always) get the acceleration problems as others have described. This has been an amazingly helpful thread. This results in increasing fuel economy (by reducing pumping losses) and a further reduction in exhaust emissions (by creating a large internal exhaust gas re-circulation effect).Īlso, to generate additional power throughout the rev range, the intake camshaft is continuously varying the amount of advance or retard, instantly adjusting to provide additional power as required by the driver. As rpm increases, the intake camshaft is advanced, opening the intake valve sooner and providing additional valve overlap. As engine rpm builds, a VTC actuator - controlled by an engine-control unit that monitors cam position, ignition timing, exhaust emission and throttle position - advances or retards the intake cam throughout a range, optimizing engine output and reducing emissions.ĭuring typical operation, the intake camshaft timing is almost fully retarded at idle to help provide more stable idling while reducing the exhaust emissions (Nox). The camshaft VTC (Variable Timing Control) system adds to the i-VTEC engine for continuously variable camshaft phasing across the engine's entire power band. The VTC while related is technically a different sytem. There is still only one soleniod for the V-Tec system.
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