celtichammer1 Posted October 14, 2011 Share Posted October 14, 2011 Hi guys another problem.1994 Ls400: Car was ideling rough and lost almost all ability to accelerate from a stop when my wife was driving it the other day. She parked it and i went to check on it later and found that it would not move over even the slightest incline from a stop but if i put it in low 1 it would take off ok and then i just shifted from there to get it home. After looking at the site i decided to clean and lube the iacv and in the process found a couple of dinged spark plug wires (which the parts house warrantied-woohoo). After cleaning and testing the iacv and replacing all wires the car started and idled smoother and sounded better than it has in months. I took it for a test run and it was perfect... for about a quarter mile, then it started the no acceleration business again unless i shifted manually. It acts like its in high gear but also it wont kick down when i accelerate hard while up around 50-60mph. Recently replaced front cat(rt. side) was glowing red and car was weak until i replaced it then it ran fine(and its not glowing now). Thanks for any thoughts. Quote Link to comment Share on other sites More sharing options...
celtichammer1 Posted October 15, 2011 Author Share Posted October 15, 2011 Update: One thing i left out was that i used carb cleaner and wd-40 on the iacv,carb cleaner on the air intake and a bottle of RXP (carbon remover)to the gas tank. Got frustrated after my post and took the car out and drove the %#@$ out of it for about forty miles. After about ten or fifteen miles the engine light went out and it felt smoother and it also shifted to passing gear when i hammered it(which i did often and repeatedly). First stop sign i encountered it ideled at a smooth 600rpm. Most of this run was at speeds in excess of 80mph and i tried to keep the rpm's at or above 3500. When i returned home and put it in park it maintained its smooth idle at 600. Soooo...hopefully i blew out some carbon garbage that i had broken loose during cleaning and this will be a lasting fix. Quote Link to comment Share on other sites More sharing options...
SRK Posted October 15, 2011 Share Posted October 15, 2011 Aha! What we used to call the "Italian Tune-up" about forty years ago. It's possible that a couple of spark plugs had some fouling, and full throttle also helps to clean the injectors ( gasoline is a great solvent of course, and at high flow rates does wonders) and heat up the cats and get them clean too. I hope it stays fixed! Quote Link to comment Share on other sites More sharing options...
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