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Other thoughts redux 900 1992

posted by  VKR on  Sun Mar 17 12:36 CST 2019
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Art, Thanks for reaching out to me. I too thought that possibly one or more fuel injectors were leaking. Approximately a year ago, I pulled all four and sent them to “RC Injectors” to have them cleaned and leak checked. I received a nice before and after report which declared them rebuilt with new O-rings and providing an improved spray pattern and balanced fuel discharge rates.

I could pull the fuel rail with all four injectors attached and test these for leaks and operation with the OBD mode 3 feature to confirm there are no leaks. However, keep in mind that my original statement was written before I realized that my overall MPG has dropped down to 17 MPG even with 75% highway driving. I seem to not only be starting rich but also running rich. Maybe I should do this check to confirm no leaks?

The oil seems to be fine and there is no dipstick lift or high crankcase pressure. A few months ago I cleaned the flame trap out, related screen, and replaced the larger related hoses and vacuum line to ensure no leaks.

Is the ECU a possible root cause or is that highly improbable?

Thanks,
Vince near Harrisburg… Baltimore is not far away I’m willing to drop it off for you to repair :-) . Plan B is in formulation and involves a brick on the gas pedal and the Chesapeake Bay bridge late at night.





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