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aloha everyone. I did the smoke test and it's a negative. Check voltage change on first do sensor with changing rpm. Negative so could be the do sensor.

Thanks. Don't think it's #3. For #1 how can I test for that without actually pulling out the fuel injectors and inspecting for partially clog nozzles? On item #2 I can't find a vacuum leak. Did try the carburetor spray. Maybe I need to look harder. This weekend will check then o2 sensor and...

I will check the o2 sensor and get back to you folks on my finding. Mahalo!0

This is a lingering problem. Car has about 180k miles. The main concern I have is the valve pinging. Here is what I observed: 1) engine light comes ON quite often under different conditions 1) when I'm accelerating at above 2000 RPM or 2) when I'm driving hard (accelerate and decelerate...

Aloha All, My engine check light comes occasionally ON and I get a P0300 & P0171. In addition, my car valves appear to be pinging especially when I am accelerating when driving on an incline. I've tried to clean the MAS using a MAS cleaner and already replaced the spark plugs. The engine...