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foxfire

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Everything posted by foxfire

  1. I have a 1991 LS 400 with 130K that has shown similar problems lately. I found this thread because I need to fix it, it is driving me crazy. About six months ago I replaced the power steering pump and had the alternator rebuilt. In the process I cleaned the throttle body and of course disconnected a few other things. Since then the missing or "chugging" has been pretty consistent throughout the gears and I have found that it does it less if I turn the overdrive button off. This changes the rpms (although I havent fixed the tach yet) you can feel it. I always thought that it was fuel related, electrical or sensor related or that maybe moisture got into something when I cleaned the engine. I have run seafoam and other stuff to try and clean it but nothing. The only thing that helps is the overdrive. Sadly it makes me want to drive faster to keep it from missing which isnt good. I never thought about the transmission or tourque converter. I would be interested also in un hooking and seeing what happens. Any response to where the sensor is located? thanks for any advice
  2. so i just finished an alternator and power steering pump changeout, coolant and oil change, serpentine belt and general engine check/clean. Put everything back and am getting a range of rpm's from about 1000 to 500, very predictable...up and down with a little engine roughness. (tach doesnt work so this is a guess). Prior to working on it I blew it off (gently) to get the grease off. No codes, changeout went good, still no codes so i am currently stumped. The only thing i may have screwed up was reconnecting the two small hoses from the PS pump back to the intake and engine but I reversed to check and no diff. All I have learned about the above work I learned from this forum so thanks, also searched for this issue but cant find anything. LS400 is a 92, has 127K. Thanks for any help, this is a great forum.
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