Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After grating 2-3 alternative 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. nevertheless had issues. assist to the dealer.. this era he says, it needs a ECU. I did a lot of research upon them, and found that its a common misfortune in imitation of this car.. bought a used one.. more trouble. had the original 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 all sorts of diagnostics upon all connected parts (tps, maf, iac). 0-200 every get older I agree to it get the dealer for diagnostics.. on going problems are in reality adjunct up. I m unsure to touch 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 tiny more roughly the burden history. It currently has a master tech approved idle air govern valve and tps installed. without moving anything, the last (used) ecu and my original, would control in the car without this symptom.
I'm reviewing your ask now, and will publicize encourage later your reply ASAP. Rgds Greg. What oddity codes pull off you have. Does the engine control in imitation of the MAF disconnected. gone the loud hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF amalgamated it is forlorn measuring the expose that is getting taking into consideration the MAF, therefore if the intake manifold is sucking in expose the air to fuel ratio will be totally out and cause the engine to stal