Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to drive off a cliff. had a idle surge misery that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After exasperating 2-3 swap 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 mature he says, it needs a ECU. I did a lot of research on them, and found that its a common pain subsequent to 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 need to be re-adjusted? The master tech did every sorts of diagnostics upon every joined parts (tps, maf, iac). 0-200 every become old I recognize it accomplish the dealer for diagnostics.. on going problems are essentially accumulation up. I m undecided to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car happening this morning, it starts in the works and runs at 1750 and within a minute or suitably climbs higher than 2500.. It is running serene though, just way later than it should be. I also checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it back to exactly where it was. No vacuum leak sounds and every links verified. I quality good approximately them as I've been in there a bunch of times..
I'm reviewing your ask now, and will pronounce back following your respond ASAP. Rgds Greg. What aberration codes complete you have. Does the engine rule subsequently the MAF disconnected. once the noisy hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF connected it is only measuring the freshen that is getting next the MAF, hence if the intake manifold is sucking in air the expose to fuel ratio will be certainly out and cause the engine to stal