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2008 chevy cobalt cold air intake12/6/2023 ![]() Any vacuum leak after the mass air flow can cause or contribute to a stall. Try snugging down the bolts on the intake and electric throttle. You might want to check for a vacuum leak around the intake manifold, clean your mass air flow sensor and electric throttle unit, check for cracked intake, or lose intake plumbing, and the little hose from the valve cover to breather, they are starting to dry rot and crack. ![]() On a different note, your stalling might not have anything to do with your code. Post added at 10:40 PM - Previous post was at 10:00 PM. The price of a new air pump, the check valve, and the plastic plumping tubes on these vehicles can easily reach about 600 - 800 in just parts. If you live in a test state, its a different story. I know someone is gonna jump down my throat and say it's illegal to mess with the emissions, but honestly if you live in a state that doesn't test for it, what's the problem. This does away with the air pump, check valve and other problems. My solution in Michigan, replace the head, and manifold(/w fed emission), then reflash the pcm as federal emission. The problem is the heads are cracking by the manifold. Doesn't sound like a good idea to me, but it helps fewer parts per million come out the tail pipe. While there is no difference in the head, the exhaust manifold is different, and the air pump blows cool air thru it into the head. I have noticed a pattern of cracked heads. Your exhaust manifold gasket could be bad or leaking.ĭo you live in a state where there is emission testing? I live in Michigan, we don't have the testing, but I have some experience with the California emission vehicles. Other times it completely stalls and I have to restart the car.ĭoes anyone know what the problem could be? One of the symptoms my engine is having is during the test I believe it increase the fuel mix to run rich, and then the ECU reads the O2 sensor to make sure the O2 value goes up when the pump kicks on, but what I'm seeing is even though I can hear the pump running, my engine starts to stall, most of the time it recovers and the RPMs jump up to about 2k, then return back down to about 800-900. I double checked the check valve and saw the solenoid was measuring about 15 ohms, and I checked the solenoid valve fuse, and that's ok. After clearing the code, it came back on later that day with the same code. Tested the air pump and found that to be faulty, also found the fuse was blown so I replaced that as well. Dominate the street or the track with this superior high-performance air filter designed to bump up horsepower, performance and acceleration to the next. Had the code on for a while now, I originally had another code saying the secondary air injection valve stuck on bank one, so I replaced the check valve and the check engine light turned off for a while.Ī few weeks later the light came back on, this time it was the P0411 saying there's a problem with the air flow. Chevy Cobalt 2008, 69 Series Typhoon Aluminum Cold Air Intake System by K&N.
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