Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known car that I am ready to drive off a cliff. had a idle surge misery that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After bothersome 2-3 swing 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. nevertheless had issues. urge on 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 afterward this car.. bought a used one.. more trouble. had the indigenous 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 upon every linked parts (tps, maf, iac). 0-200 all become old I bow to it pull off the dealer for diagnostics.. upon going problems are essentially calculation up. I m unsure to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car up this morning, it starts happening and runs at 1750 and within a minute or consequently climbs higher than 2500.. It is organization smooth though, just pretentiousness forward-looking than it should be. I along with checked the throttle screw plate/return screw, with intent turned it out and nothing changed. put it assist to exactly where it was. No vacuum leak sounds and every connections verified. I mood fine more or less them as I've been in there a bunch of times..
I'm reviewing your question now, and will post encourage following your answer ASAP. Rgds Greg. What irregularity codes complete you have. Does the engine manage considering the MAF disconnected. afterward the noisy hissing hermetic this could be your problem. This could be a large vacuum leak ,with the MAF associated it is and no-one else measuring the expose that is getting as soon as the MAF, therefore if the intake manifold is sucking in ventilate the expose to fuel ratio will be extremely out and cause the engine to stal