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Date Posted: 10:55:42 05/20/04 Thu
Author: (TLR)Marty - WA
Subject: What was the extent of the crash damage? (More inside ...)
In reply to: Tom 's message, "00 TLR 9050 miles misfires when warm" on 19:03:00 05/19/04 Wed

What was the extent of the crash damage? Don't rule out the obvious. Remember engines need 3 things to run: Air, Fuel and Spark. This engine being and EFI engine, it just has an electronic fuel and spark management system, but it operates on the same principles. If the engine runs well cold, and with no "choke", I would think that it is running a little rich. My TLR used to be hard to start cold but then purred like a kitten once she was warmed up. If it's running rich with no codes in the computer, that could be due to a couple of things: 1) clogged injector causing it to stay open for too long. This is a distinct possibility if it sat for too long without being run waiting for repairs. Modern fuels turn to a gooey "varnish" when they dry making a mess of small orifices like injectors. Another possibility is that the TPS got knocked out of alignment. Or the temp sender, coil(s) or rectifier are no good. These could be coincidental and just bad timing to your repair. But all of these are parts that can go bad and not throw a code, the value has to be read through testing the component or by reading the value on a scan tool. Remember, the communication loop of the electronics is one way, the ECU doesn't always check to make sure it's getting good information.

On the other hand, you mentioned that the bike "misfired". Is that a backfire through the exhaust (likely a rich condition) or is it a pop through the intake (under the tank)? If it's popping through the intake, that's usually the result of a lean condition. Since you said that the bike was crashed, I would check the throttle body boots and mating surfaces of the intake. If the bike gets hot and these parts expand, if the mating surfaces don't seal they can leak air into the intake (past the fuel injection point) and lean out the mixture. This could get worse as the engine gets hot, and lean out so badly that the engine won't want to run. If the bike was crashed, the intakes could have been damaged/bent to leak air, or when the bike was apart the boots might have not been installed properly.

Just a few easy things to check. It's usually something simple, it's just a matter of finding it. Good luck!

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