![]() No antitheft light, no stumble, runs perfect. Couple days later it's upper 30s here and boom fires right up. Everything checked out fine, starts great, runs great, drives alright, then I went out on a cold day to move the car and nothing. Everything went pretty easy and did another compression and leak down test with fingers crossed. I replaced the gear along with the crank seal, cam seals, pulled intake replaced plugs and valve cover gaskets. I found out he misaligned a cam gear while bolting it back onto the cam and ruined the gear. I ordered a gasket kit, figuring if valve to piston contact did happen that I would all the gaskets to do everything. So after this i decided to pull the timing cover off and attempt to set the timing. Her friend didn't get the engine back in time. Hooked up a leak down tester to it and my suspicions were correct. Checked compression, numbers fell evenly across the front bank. He replaced cam seals and afterward she had running issues. Here is a more detailed list of the eight symptoms that may indicate an impending failure of the oxygen sensors.Received this vue from a family member who had it worked on by a friend. The first sign that something is wrong normally occurs when the Check Engine Light comes on. In many cases, there can be a trouble code related to the oxygen sensor, and you don’t notice any other symptoms at all.Īll of the trouble codes P0030, P0031, P0130, P0131, P0132, P0133 and P0134 have to do with the oxygen sensors. #2003 saturn vue injector replacment 3.0 video code With this in mind, you can see any number of trouble codes relating to an air-fuel mixture imbalance that could ultimately be caused by the oxygen sensor. Inside the combustion chambers, there must be the right amount of air and fuel mixing. If there’s more fuel than air, your defective oxygen sensor might not be able to detect it.Īs more fuel burns in the engine, your gas mileage decreases. What you are left with is more money spent at the pump and more frequent trips to the gas station. If you’ve noticed that the car runs roughly when it’s stopped or parked, the idle is off. Usually, a car should idle at around 1,000 or fewer RPMs. If it shoots up, there could be an issue with the oxygen sensor. However, a rough idle isn’t always indicative of a bad oxygen sensor. It could mean any component that’s responsible for the air-fuel ratio is defective. READ MORE: 10 Causes of Car Engine has Rough Idle (How to Fix it) Stalling Engine That’s why you need to compare this symptom with the others. When the engine idle gets too rough, the motor could stall. This problem normally starts out as a misfire and doesn’t normally occur until the problem has been left unresolved. ![]() If the engine is unable to sustain the right amount of power to remain working, it will shut down. You should still be able to get it started again, but there are no guarantees. If the normal combustion process is interrupted, you can expect to notice trouble with the performance of the engine. It’s going to be weaker than normal, especially when you try to push on the gas pedal. At first, this problem can be so subtle that you don’t notice it’s occurring. The problems could continue getting worse until driving becomes cumbersome. RELATED: Car Losing Power When Accelerating? (Here’re the Causes) Failed Emissions Test That’s why it’s important to have the fault looked at as soon as you notice it, especially before the lack of acceleration leads to an accident on the road. The oxygen sensors are part of the emission control system in the vehicle. ![]() If they aren’t working, there could be an imbalance in the exhaust, which would be read through an emissions test. While there are numerous reasons to fail these mandatory tests, the oxygen sensors tend to be a major culprit. Once the test has failed, have the computer checked for codes that show you what the problem might be. When an oxygen sensor fails to monitor the air-fuel mixture, an abundance of carbon could build up in the combustion chamber. This problem could cause a lean-running mixture in the motor. With a lean mixture, you are left with pre-ignition that leads to pinging or knocking noises. However, these noises can also occur for other reasons, such as a clogged fuel injector, bad fuel or engine damage. RELATED: 7 Engine Noises You Should Not Ignore (& What They Mean) Catalytic Converter Failure Most often, these noises are heard under engine load. ![]() What happens if you continue running the system with a bad oxygen sensor? Eventually, the catalytic converter will fail because of the imbalance of air and fuel. The oxygen sensors must be in optimal working order to keep the catalytic converter from damage. It’s never cheap to replace a catalytic converter.
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