In case of doubt, the sensor may have to be replaced. However, it can happen that there are no error codes. If you see P0100, P0101, P0102, P0103 or P0104 code in the OBD2 scanner, it indicates a problem with the mass air flow sensor. Reading out the fault codes using a diagnostic device is relatively reliable. How to check if the MAF sensor is bad in Hummer H3? This can especially happen in older vehicles or in case of rodent damage. In rare cases, it is possible that the fault codes or the symptoms you’re seeing in your H3 are not due to a bad MAF sensor, but because of broken electrical wires or a bad connector. In rare cases, the MAF sensor can also be damaged by oil vapors flowing back out of the crankcase ventilation after the engine has been switched off. When driving fast in heavy rain, water can occasionally pass through the air filter and can damage or contaminate the MAF sensor, which can severely impair its functionality. There is no fixed timeline for when MAF sensors fail, sometimes they can last the lifetime of the vehicle, other times than can fail even before the warranty expires. With a noticeable loss of performance and high mileage, a defective MAF sensor should definitely be considered. As the mileage increases on your H3, it can happen that increasingly inaccurate values are sent to the engine control unit. The mass air flow sensor is a wearing part. And over time when enough dust accumulates, the sensor starts to give erroneous readings. When the vehicle is running, dirt and other airborne particles that escape from the air filter can settle on the sensor. Air filters are effective at cleaning the air to a certain extent. The most common cause of a malfunctioning MAF sensor in Hummer H3 is dirt and grime accumulation on the sensor. What causes MAF sensor to fail in H3? Dirt accumulation This can cause the engine warning light to illuminate in the instrument cluster and the fault can be read out by a diagnostic device. The engine runs too “lean” or too “rich”. The optimal amount of fuel can no longer be calculated which results in either too little or too much fuel injected into the combustion chambers. If the MAF sensor is defective or dirty, it does not send correct measured values to the control unit of H3. What happens when MAF sensor malfunctions in Hummer H3? It is not only important for power delivery in your H3, but also for the lowest possible pollutant emissions. You can use the Air-Doc with a Throttle body spacer but it reduces the remaining flexible areas, making a tight fit,you might need to 'trim' some plastic, other than that you need to program the ECM for it.which you should be doing for all mods anyways.Īnd it won't work with a 4WD! If you have one that will fit for a Hummer H3, as long as it has all the same connections for the O2 sensors, then you simply need to make sure the ECM is recalibrated to take advantage of it.this is the only way to have no codes.įor the head bolts, even if they crack in the head, just use a MIG and weld a washer around the head of the bolt, then weld a nut to the washer, the heat will allow you to turn the bolt right out without any problems, I know I have done many, and never once had to pull a head for a broken exhaust manifold bolt! Note: This is an easy fix on Aluminum heads.DO NOT try this on Cast Iron Heads! For the CAT Back, I use a Gibson Stainles Steel Exhaust and Headers, mine has been on my H2 since 2006 and has had a very hard life and it is still great, expect for my exhaust tip which has been crushed multiple times! I would suggest a Gibson CAT back in place of the Magnaflow, more power, better mileage and less noise.The mass air flow sensor is part of the engine’s intake system and is located between the air filter and the throttle body. Johnny, if everything is done right you will have no problems! If things don't ! Be prepared to start drinking heavily. If all goes well ? Yes you will be able to push your 35's and ucp like you were only running P265'S. You are looking at well over $ 2000 installed. Remember the header with cat back installed. Can explain the installation issue in regards to the header. Maybe the other guys can shed more info and the few mechanics on here. I am just informing you on stuff that i have read or heard. Has the head been done on your rig ? If it has been in the last 2 years. Also the exhaust bolts there, if they break due to being seized ?! It Can crack your head. Remember they are not cheap and not easy to put in. The code issue made them want to rip their hair out. Yes all said the power difference was very noticeable. A Lot of the American guys have messed around with header issue with mixed results. I believe there is 2 companies that make the header as well as Magnaflow. As for the header There has been issues with it throwing codes. Air Doc does not recommend you use a throttle body spacer.
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