Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public 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 maddening 2-3 oscillate 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. put up to 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 problem 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics on every associated parts (tps, maf, iac). $100-200 all time I allow it accomplish the dealer for diagnostics.. on going problems are essentially addendum up. I m of two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I did re-check them tho. The master tech did extensive tests upon the expose flow meter and said it was good. behind I unplug it and control the motor, the car runs rude and at 850ish. I can only guess that my other rebuilt ecu has an issue, or the tps needs to be re-adjusted, or anyhow my maf has died in the midst of every this. I don't think the tps has that much control in the alternative of rpm though? I think it by yourself adjusts it almost 1k..
This could be a large vacuum leak ,with the MAF combined it is single-handedly measuring the freshen that is getting considering the MAF, fittingly if the intake manifold is sucking in let breathe the air to fuel ratio will be very out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. taking into consideration carb cleaner spray can spray can in the area of the hissing as soon as the engine processing and in the manner of you listen the engine stall or rev difficult there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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