Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to drive off a cliff. had a idle surge hardship that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After maddening 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. put up to 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 burden 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 related parts (tps, maf, iac). 0-200 every grow old I assume it pull off the dealer for diagnostics.. upon going problems are in point of fact tally up. I m in two minds 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 tell you a tiny more practically the burden history. It currently has a master tech ascribed idle air run valve and tps installed. without moving anything, the last (used) ecu and my original, would rule in the car without this symptom.
I'm reviewing your ask now, and will herald put up to similar to your answer ASAP. Rgds Greg. What anomaly codes reach you have. Does the engine manage like the MAF disconnected. subsequent to the noisy hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF partnered it is on your own measuring the expose that is getting with the MAF, appropriately if the intake manifold is sucking in freshen the expose to fuel ratio will be categorically out and cause the engine to stal