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Sporadic missing and backfire
Posted by Dave S. [Email] (more from Dave S.) on Sun, 23 Sep 2001 13:41:33
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My '87 900T has lately been missing and backfireing. This started about three weeks ago and happens only occasionally but the frequency is increasing. It was due for a tune up when the symptoms first started so I replaced the plugs, cap and rotor, measured the plug wires for resistance, set the timing and adjusted the idle. I also replaced the AMM due to a loping idle condition. When the engine isn't experiencing one of its missing and backfireing seizures it runs great. Does anyone have any suggestions on where I might begin to troubleshoot. I suspect either the ignition control unit or the ECU. Your replies will be greatly appreciated.
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