A funny sound and some smoke.

[tony1977]

Hey All, a really long post here, and probably riddled wth spelling mistakes, please forgive that.

Hoping someone out there will be able to help me out with this. I have a 91 Beat - runs well - but is having a few small issues. It does not burn or go through any oil.

1) A funny sound. Sort of a high pitched whine when the engine is below 3k. I heard another Honda Beat and it did not make the same noise, but I have seen videos of others that do.

Here is a couple short and lame videos of it making the sound (only have my mobile here). The loud roar in the first video is a jet overhead.

Video1
Video2

Here is a video off youtube of another guy's beat. Seems to make the same noise. The poor little beat.

Video

2) I seem to be having a rich running condition. The engine seems to over fuel after revving. If you rev it to 5k and then back off, you get black smoke for a few seconds. Same thing after running it for awhile. Once it drops back to idle, it runs rich again. Now and the it will produce a small backfire, or more of a burp really.

So far I have taken the following steps.

- Checked and cleaned the Distributor cap. Had some buildup on the contacts but cleaned off it is like new. Centre connection is fine.
- Checked Rotor (good shape)
- Set engine timing and idle
- Replaced all Caps on the ECU (they were bulging, but not exploded).
- Checked engine compression. All cylinders are the same (100 PSI /6.9)
- replaced Air cleaner and spark plugs.
- Cleaned the throttle body

The previous owner cut a large hole in the air cleaner cover (I guess to allow higher airflow). I have patched it - but it may leak a small amount of air. My understanding is that would cause a lean condition though. Working on replacing that anyway. I can see it causing problems if the engine has a Mass Airflow Sensor or Intake Air Temp sensor and the head of the intake.

I was thinking of heading in the direction of O2 sensor or coolant sensor (reporting the engine is always cold and overfuelling).

Any advice would be most appreciated.

3) In the attached pic - the circled device (I think it is the idle control valve) there seems to be some green residue around the base of it. Doesn't look like anitfreeze, but I am not exactly sure what it is. What is this device. Does coolant run throuhgh it?


And that brings me to the last and final.


4) Position of Sensor - does anyone had a diagram with the position off all of the engine sensors?

Again any help or advice would be most appreciated.