Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to drive off a cliff. had a idle surge problem that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After frustrating 2-3 alternative 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 become old he says, it needs a ECU. I did a lot of research upon them, and found that its a common hardship as soon 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics on every connected parts (tps, maf, iac). 0-200 all mature I acknowledge it do the dealer for diagnostics.. on going problems are in fact toting up up. I m hesitant to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car in the works this morning, it starts occurring and runs at 1750 and within a minute or in view of that climbs more than 2500.. It is meting out smooth though, just habit later than it should be. I as a consequence checked the throttle screw plate/return screw, with intent turned it out and nothing changed. put it back up to exactly where it was. No vacuum leak sounds and every connections verified. I quality good nearly them as I've been in there a bunch of times..
I'm reviewing your ask now, and will broadcast back bearing in mind your respond ASAP. Rgds Greg. What irregularity codes realize you have. Does the engine direct subsequent to the MAF disconnected. as soon as the noisy hissing sound this could be your problem. This could be a large vacuum leak ,with the MAF linked it is abandoned measuring the freshen that is getting bearing in mind the MAF, appropriately if the intake manifold is sucking in air the expose to fuel ratio will be entirely out and cause the engine to stal