Re: Update on my LT for the BBD group
Engine is running rich. Fuel pressure is good now. I'm assuming it's fouling all four plugs, indicating it's NOT a leaky injector on one cylinder. Bike ran okay for awhile, then started running terrible. O2 sensor is new.
One of the things that gets overlooked all too often: GROUNDS. Ask the tech if he has checked voltage drop on the ground leads to the control unit. A lot of service manuals will have resistance checks as part of the diagnostics, and the wiring may read okay with an ohmmeter. However, put that same wire under an electrical load, and the voltage drop from the control unit to ground rears it's ugly head.
The check is fairly simple - use the voltmeter with the common lead grounded to the battery negative post, start the bike, and check the voltage at the ground terminals of the control unit. If the voltmeter is reading higher than 0.2 volts, you've found a problem. Make sure it gets checked with the bike hot, since it runs worse when warmed up.
You'd be surprised at the number of oddball driveability and MIL complaints I've found with those simple checks. Hope it helps you out.
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2002 K1200LT (going, going, GONE)