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2026. 6. 30. 작업
Fuel Trim Readings
@Fred Wilson's comment is right on the money, high, positive long term fuel trims at idle that reduce at higher engine speeds indicate the presence of higher-than-normal unmetered air. The fact that it's unmetered indicates that you need to look for something after the MAF/MAP sensor. Things to check include: Unplugged/damaged hoses (e.g. EGR, PCV) Cracks in the intake manifold Leaky intake manifold gaskets Leaky brake booster vacuum line Fuel management picks up the presence of excess air at exhaust via the O2/lambda sensors and adjusts for it by keeping the fuel injectors open for longer. This question lists some possible methods to discover the leak source(s): How can I detect vacuum leaks without access to a smoke machine? All the best.
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2003 Hyundai Santa Fe will start then die. Then it will not start. After pumping the accelerator or holding on the floor and returning later it will start. Nothing codes out. This happens probably 15% of the time. Any ideas?
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A friend has an older Miata that was improperly stored for at least three years. Most of the time, it was not garaged. The gas is old, the battery is dead, it has not been started. It was probably parked without an oil change. He is looking to do the minimum to get this sellable, so the primary concern is the initial startup and the brakes. What would be recommended , especially regarding that first engine startup?
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I am planning to start using seafoam in my gas and oil ,how often should you a add it an how much.The label isn’t to clear about it.
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I’ve asked a few mechanics and DIYers this question and so far no consensus. Let’s say you’re 1000 miles away from next SCHEDULED oil change, and you’re about to leave on a 2000 mile road trip. Would you choose to change your oil 1000 miles early before the trip, or 1000 miles late after the trip?