When you experience Honda VTEC system difficulties it will often set a diagnostic trouble password to help point girlfriend in the direction of fail components. However, ns just acquired done functioning on a 2002 Honda Accord with the four-cylinder engine.

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In enhancement to the inspect engine light, the client complained of, lack of power and also bucking before shifting gears. ~ above a roadway test I discovered that the vehicle didn"t want to walk over 3000 RPMs. In this specific automobile, us traced the failure down to a defective valve time oil press switch.This little machine threads into the Honda VTEC solenoid assembly. Upon further inspection, we found a little oil leak comes from the bottom edge of the solenoid housing. For this reason we chose to traction the assembly off of the Honda Accord and take a look in ~ it ~ above the bench. What we found was a deteriorating gasket.

In this situation, i laid the repair options out for the driver. Obviously, instead of the gasket and the VTEC pressure switch would be the lowest expense option. Climate we referred to as the dealership to price these 2 parts. When the driver made decision to go online and also shop approximately they discovered a finish assembly for less than the expense of the gasket indigenous the regional Honda dealership.

In this write-up we"ll talk about the signs and also symptoms of Honda VTEC system problems. We"re also going to describe the major difference in between the variable valve timing equipment of a Honda car when compared to VVT difficulties with general Motors cars.Before we move on let"s finish up the story about this 2002 Honda Accord. When the customer drove end to the local Honda dealership, he talked to the organization department around what the repairs would price through the dealership. That course, the service writer want to verify the failure before quoting prices. However, through a tiny persuasion lock told my client parts and also labor comes in around $400 because that this repair. We got the components for $60 and also it take it me around a fifty percent hour to placed them in. In this article we"ll cover part repair tips and talk around the best means to access these components. Hint, girlfriend don"t desire to go in from the top and you probably want come pull turn off the wheel to gain access on a CRV.

Symptoms that Honda VTEC Problems

The general or most usual Honda VTEC system problems produce symptoms that fall into two significant categories. The an initial one is a fail of the mechanism to engage the high lift, longer duration lobe of the camshaft. We"ll obtain into exactly how the VTEC mechanism works in ~ the end of this article.For currently what we require to recognize is the VTEC role is asked for by the vehicles main computer. Long story short, the computer energizes the VTEC solenoid and also the spool valve. There are a couple of various codes that set depending on the defect in the system.

With the said, the P1259 trouble password is the one i see many often. This trouble code often leads to parts replacement, yet still demands diagnosis to recognize which one. We"ll talk much more about this in the diagnostic section below.


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Honda Vtec System trial and error Diagram

There is second problem that public SI, CRV and Honda Accord owners more than likely wouldn"t intend to uncover on their reputable Honda. An additional common symptom the Honda VTEC system troubles becomes one oil leak that creates slowly, but consistently worsens over time.

The VTEC solenoid actually enables oil to circulation to the inner galleries the the overhead camshaft. This method that the real estate of the solenoid is holding earlier full engine oil pressure.

Unfortunately, the generosity rubber gasket installed from the manufacturing facility isn’t aging and also Honda engineers hoped. In fact, the rubber starts come harden and also shrink. Once this occurs we begin to acquire a little oil leak. Together the degradation continues, we can even construct cracks in the manufacturing facility rubber gasket. Then the oil escapes conveniently from the engine at this point.

Diagnosing Honda VTEC system Problems

Let"s begin off with the typical Honda examine engine light code mentioned in the previous section. The P1259 means a VTEC device malfunction. This doesn"t specifically tell you what"s wrong, yet we currently have a good idea of where to start.The oil pressure switch and also the solenoid work together through activating the high performance setting on the camshaft. As you deserve to imagine the very first thing you need to have actually is adequate engine oil pressure. Top top Hondas through high purpose of use this can be one issue. Sludge in the bottom of the oil pan from lack of maintenance can restrict the oil pump pickup screen and reduce engine oil pressure.You deserve to verify 30 psi of oil pressure at idle when the engine is warm using a mechanically gauge. Following the computer starts looking for the oil press switch come close come verify sufficient oil push exists to engage the camshaft into high performance mode. Therefore, fail of the VTEC oil push switch causes the system to was standing down and drivers complain about lack of power.

Although the Honda VTEC solenoid stays a trustworthy component it will not critical forever. In my experience I have found the gasket roughly the real estate to fail prior to the solenoid. Through that said, anytime I have just replaced the gasket ns wound up instead of the solenoid at some near future date.Therefore, ns recommend if you have actually a fail of the oil switch that you should more than likely go ahead and replace the entire assembly if you arrangement on maintaining the automobile for a while. Finally, keep in mind the the oil push switch has two wires going come it and also the signal cable to the solenoid is one power wire through a instance ground. Damages to any kind of of the wiring remains a strong possibility.This is why ns recommend using a automotive scan tool through data present capabilities for diagnosing Honda VTEC mechanism problems. Not just will you have the ability to pull the trouble password that puts you on the correct route of diagnosis, yet you can also pull increase the data stream to verify wire integrity and proper operation.

How to replace the VTEC Solenoid


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Honda Vtec Solenoid location Diagram

The difficulty level of instead of the Honda VTEC solenoid varies with the different models that use this technology. The CRV provides much more challenges, but also provides another accessibility point when you remove the right front tire. The course, friend must present vigilance about safety by using Jack stands and also wheel chocks.You have the right to hunt down your specific replacement procedure by in search of Honda Vtec solenoid replacement on YouTube. On the Honda civic SI and the accord with the 2.3 l or 2.4 l four-cylinder Honda engines we uncover the VTEC solenoid ~ above the left rear of the cylinder head. The VTEC solenoid housing likewise provides a threaded hole because that the oil press switch and o-ring us speak that in the diagnosis ar above.When you start repairs you"ll find three 10 mm retaining bolts. Getting at these v a wrench or 3/8 inch typical socket set is almost impossible. However, a small sized quarter inch ratchet set with a little extension makes rapid work of the repairs. On most models i can get this done in about 20 minutes. Through that said, the first time ns did that on a CRV I most likely spent around an hour instead of the Honda VTEC solenoid assembly.

How the VTEC Solenoid mechanism Works


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VTec Solenoid and also Spool Valve

The Honda VTEC mechanism is just the Honda means of performing change valve timing. All of the major car carriers are making use of (VVT) variable valve time to rise performance and also fuel economy at the very same time. The main benefit of the system originates from the capability to advancement the time on the fly once extra strength becomes necessary.Before we dig into just how the Honda mechanism works I wanted to cite that everybody is having troubles with VVT technology. Chevrolet uses electronic came phasers and actuators to development the ignition timing. This allows them to do micro adjustments top top the fly. Unfortunately, general Motors is having problems with VVT actuator solenoids.Whereas basic Motors provides the video camer gear to adjust the ignition time Honda has actually taken a completely different approach. They have a high power lobe on the camshaft that rises the lift and duration. Basically, this method that the entry valve opens broader and continues to be open much longer to rise the fuel fee for the burning cycle.

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We usage to placed high elevator camshaft"s in ours muscle auto engines, but they would certainly run very poorly at idle. This made us compromise top top just exactly how radical we could go through a camshaft lift and also duration. Honda has actually solved this, due to the fact that when the engine return to idle they disengaged the high power lobe using the VTEC solenoid come disengage the rocker arm.Honda builds a great car and also even despite this VTEC problem will need addressing by thousands of drivers it would certainly seem worthwhile to do the repairs and also continuing to operate the car until bigger problems come along. This is just one of the factors that i recommend the Honda heat of cars together a wonderful entry-level vehicle. Protect against by the deal with my old ride website homepage to discover out what else us cover ~ above this automotive website specializing in enlarge cars provided for daily transportation.