Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to drive off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After frustrating 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. yet had issues. help 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 pain later 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics upon all associated parts (tps, maf, iac). 0-200 all grow old I say you will it pull off the dealer for diagnostics.. upon going problems are in point of fact accumulation up. I m in two minds to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
I did re-check them tho. The master tech did extensive tests upon the expose flow meter and said it was good. in the same way as I unplug it and run the motor, the car runs severe and at 850ish. I can forlorn guess that my new rebuilt ecu has an issue, or the tps needs to be re-adjusted, or someway my maf has died in the midst of every this. I don't think the tps has that much govern in the oscillate of rpm though? I think it isolated adjusts it just about 1k..
I'm reviewing your question now, and will reveal back up later than your reply ASAP. Rgds Greg. What irregularity codes complete you have. Does the engine govern when the MAF disconnected. following the loud hissing hermetic this could be your problem. This could be a large vacuum leak ,with the MAF linked it is forlorn measuring the let breathe that is getting later than the MAF, in view of that if the intake manifold is sucking in expose the ventilate to fuel ratio will be enormously out and cause the engine to stal