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Showing results for tags 'SPFI misfire'.
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Alright ladies and gents, this one has my head scratching. 91 SPFI EA82 5MT At cruise, random lurching/bucking/misfiring and tach is jumping several hundred RPM while trying to maintain speed. At WOT, purrs like a kitten and pulls hard. Upon engine braking, the tach jumps several THOUSAND RPM but the engine is smooth. Tach jumps all over the map on engine braking. Will also do this in idle. And when it lurches, it's very sharp and sudden, like a hiccup. Cap and rotor have less than 20K miles, as do NGK wires and plugs, original coil which tests within resistance specs on both the primary and secondary windings. CAS is original, rotor is NOT loose on the shaft, however, I can rotate it about 10-15* with some resistance. NO shaft play. Wires are seated fully, good connections at all the CAS, transistor and coil plugs. Good, clean ground. No check engine lights, but haven't looked for stored codes yet. Now for the kicker: Car does this intermittently. Sometimes it will, sometimes it won't. Seems to disappear every time I screw with the coil-to-cap wire at the coil. Ideas? I've got an extra transistor and CAS, and I'm at wit's end on this one... If someone has a SSM they'd like to lend, I'll gladly compensate...
