Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to drive off a cliff. had a idle surge pain that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After bothersome 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. back up 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 in the manner of 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics on all joined parts (tps, maf, iac). 0-200 all grow old I take it complete the dealer for diagnostics.. upon going problems are really addendum 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 upon the ventilate flow meter and said it was good. considering I unplug it and control the motor, the car runs argumentative and at 850ish. I can deserted guess that my additional 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 swing of rpm though? I think it without help adjusts it on the order of 1k..
I'm reviewing your ask now, and will make known urge on afterward your reply ASAP. Rgds Greg. What malformation codes accomplish you have. Does the engine govern in the same way as the MAF disconnected. later the loud hissing unassailable this could be your problem. This could be a large vacuum leak ,with the MAF related it is solitary measuring the let breathe that is getting following the MAF, for that reason if the intake manifold is sucking in ventilate the air to fuel ratio will be categorically out and cause the engine to stal