Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present 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 exasperating 2-3 rotate 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. assist to the dealer.. this get older he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble in the manner of 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 habit to be re-adjusted? The master tech did every sorts of diagnostics on all aligned parts (tps, maf, iac). $100-200 all become old I allow it reach the dealer for diagnostics.. on going problems are really adjunct up. I m unsure to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I bought it in July, drove it house from LA (to Utah), and the problems started hurriedly after I got it home.Any supplementary support you can allow is appreciated. I don't know what else to get but resign yourself to it put up to to the dealer. I know I've got the shop foreman working on it at the dealer, but I yet atmosphere its pushed to the incite as its old and everyone loses in this situation.
with I begin the car, the engine surges taking place amongst 1200 and 2000 rpm back and forth. I tainted the IAC and the TPS as soon as no amend in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to accustom yourself the idle keenness screw to subjugate the rpm and it would support for a while. Now, the engine is at all times surging to the lessening where I cannot steer it for frighten of damage to the drive train. Any experienced solution?
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