Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to steer off a cliff. had a idle surge misery that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After bothersome 2-3 substitute used IAC s, I took it to the master tech at lexus. He said it was the IAC valve. He tried my used ones.. and finally a rebuilt one. yet had issues. incite to the dealer.. this mature he says, it needs a ECU. I did a lot of research on them, and found that its a common difficulty once this car.. bought a used one.. more trouble. had the native one rebuilt by a specialist.. and that s where I am at now.. Put it in tonight and the car idles at 2k rpm. Does the TPS craving to be re-adjusted? The master tech did every sorts of diagnostics upon every partnered parts (tps, maf, iac). 0-200 all mature I assume it get the dealer for diagnostics.. upon going problems are essentially additive up. I m of two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car going on this morning, it starts in the works and runs at 1750 and within a minute or therefore climbs more than 2500.. It is admin mild though, just pretension far ahead than it should be. I next checked the throttle screw plate/return screw, with intent turned it out and nothing changed. put it urge on to exactly where it was. No vacuum leak sounds and every links verified. I mood good just about them as I've been in there a bunch of times..
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