Originally posted by McGyver
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Thing is though, the car runs GREAT. I just put low-mile injectors in it of the correct size (had 17#s in it before but never got around to tuning) and finally got a high idle issue sorted (bad TPS), and I thought it ran fine before, but throttle response and driveability are both noticeably improved since those were installed. It always pulls strong to redline and breaks the tires loose going into 3rd.
Spark plugs have less than 5k miles on them, but maybe its time for ignition parts? It has been 50k miles since I replaced everything else. BMW service interval is supposedly 80k (according to Pelican Parts), but I apparently used Bremi cap/rotor, not Bosch, and an IE wire set which I know is likely Chinese and of questionable quality. Could that be enough to do it?
Car has been tested for vac leaks recently, using a good smoke tester (I've used cheap smoke testers that suck), small leak was found in crankcase vent hose which has since been replaced, so I doubt it is that unless it is something new and random.
Also, regarding the gas cap failure... Can I just replace the seal with the OEM part, or is there something else in the cap itself that can fail, requiring replacement of the entire unit?
Thanks a metric tonne for the info and brainstorming so far.
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