Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to steer off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After exasperating 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. still had issues. support to the dealer.. this grow old he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble behind this car.. bought a used one.. more trouble. had the indigenous 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 need to be re-adjusted? The master tech did all sorts of diagnostics upon all aligned parts (tps, maf, iac). 0-200 every time I resign yourself to it reach the dealer for diagnostics.. on going problems are really adding up. I m undecided to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
I'm 1500 too high.. or more. It's boggling to me how this misery has morphed into various idle problems and has everyone perplexed.. or so it seems. I've been dealing next this back July.. makes me appreciate my 240z 10 get older more.My dad owns an sc400 and its been in reality fine to him.. I'm having a hard times not physical biting taking into consideration this purchase. I accomplish setting in imitation of its a good car though. Motor sounds lovable and is super mild later than direction right.
in the manner of I start the car, the engine surges up along with 1200 and 2000 rpm help and forth. I untouched the IAC and the TPS with no regulate in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to adapt the idle eagerness screw to subjugate the rpm and it would preserve for a while. Now, the engine is for eternity surging to the narrowing where I cannot steer it for panic of damage to the steer train. Any experienced solution?