In this case the smoke was coming from the bottom of the cover over the resistor board. Since I had never run any tests on the AFM, I decided this was the perfect opportunity to remove and test the unit before sealing it up. Additionally my fuel pump would run when the engine was not running. This is a safety feature controlled by the AFM so this would give me an opportunity to correct this issue as well.
After removing the AFM I gently scraped the existing glue and silicone from the cover (it looked like it had been opened before). Removing the cover revealed some internals that looked almost new.
Fixing the fuel pump shut-off was simply a matter of slightly bending the small spring that counteracts the main spring at the very beginning of the movement (seen opposite the weight in the picture above). This bend allowed the door to completely close and thus the fuel pump switch to open when no air was moving through the intake.
I then ran through the tests outlined in the factory service manual, measuring resistance between pins. All tests passed with flying colors.
I used some Ultra-Black RTV silicone to reattach the cover and seal the unit. A subsequent smoke test proved that resealing the cover corrected the leak. I also confirmed that the fuel pump did not run until air was flowing through the meter.
No comments:
Post a Comment