Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After frustrating 2-3 every other 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. put up to to the dealer.. this grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem in the same way as 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 linked parts (tps, maf, iac). $100-200 all become old I take it complete the dealer for diagnostics.. on going problems are in fact tally up. I m in two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Thanks for your response. I just checked what you mentioned, that I hadn’t already checked, except fuel pressure.Let me say you a little more nearly the suffering history. It currently has a master tech qualified idle expose rule valve and tps installed. without moving anything, the last (used) ecu and my original, would rule in the car without this symptom.
This could be a large vacuum leak ,with the MAF associated it is only measuring the let breathe that is getting with the MAF, fittingly if the intake manifold is sucking in let breathe the air to fuel ratio will be entirely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. next carb cleaner spray can spray can in the place of the hissing past the engine organization and bearing in mind you listen the engine stall or rev difficult there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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