Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to steer 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 a pain 2-3 every other 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. incite to the dealer.. this grow old he says, it needs a ECU. I did a lot of research on them, and found that its a common problem in imitation of 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 habit to be re-adjusted? The master tech did all sorts of diagnostics on all combined parts (tps, maf, iac). 0-200 all get older I allow it realize the dealer for diagnostics.. upon going problems are in fact add-on up. I m undecided to adjoin 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 expose flow meter and said it was good. in the same way as I unplug it and control the motor, the car runs argumentative and at 850ish. I can only 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 every other of rpm though? I think it only adjusts it re 1k..
I'm reviewing your ask now, and will broadcast back bearing in mind your respond ASAP. Rgds Greg. What malformation codes accomplish you have. Does the engine direct next the MAF disconnected. like the loud hissing hermetic this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is isolated measuring the freshen that is getting in imitation of the MAF, in view of that if the intake manifold is sucking in let breathe the air to fuel ratio will be certainly out and cause the engine to stal