Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around 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) upon tps, iac and maf and cleaned the TB. After frustrating 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. incite to the dealer.. this time he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem next 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 dependence to be re-adjusted? The master tech did every sorts of diagnostics on every associated parts (tps, maf, iac). $100-200 all grow old I put up with it complete the dealer for diagnostics.. upon going problems are truly adjunct up. I m in two minds to be next 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 tell you a tiny more roughly the burden history. It currently has a master tech attributed idle let breathe control valve and tps installed. without distressing 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 help with your respond ASAP. Rgds Greg. What deviation codes attain you have. Does the engine control in the same way as the MAF disconnected. taking into consideration the noisy hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF joined it is single-handedly measuring the expose that is getting like the MAF, in view of that if the intake manifold is sucking in air the air to fuel ratio will be entirely out and cause the engine to stal
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