Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public 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 irritating 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. back up 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 suffering subsequently 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 compulsion to be re-adjusted? The master tech did every sorts of diagnostics upon all aligned parts (tps, maf, iac). 0-200 all become old I put up with it accomplish the dealer for diagnostics.. on going problems are in reality tallying up. I m unsure 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 on the air flow meter and said it was good. subsequent to I unplug it and direct the motor, the car runs rude and at 850ish. I can forlorn guess that my supplementary rebuilt ecu has an issue, or the tps needs to be re-adjusted, or anyhow my maf has died in the midst of all this. I don't think the tps has that much govern in the exchange of rpm though? I think it unaided adjusts it on the subject of 1k..
I'm reviewing your ask now, and will state help taking into account your respond ASAP. Rgds Greg. What fault codes attain you have. Does the engine govern taking into consideration the MAF disconnected. behind the loud hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF related it is lonely measuring the expose that is getting gone the MAF, suitably if the intake manifold is sucking in ventilate the expose to fuel ratio will be agreed out and cause the engine to stal