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 difficulty that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After exasperating 2-3 stand-in 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. 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 trouble like 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 all combined parts (tps, maf, iac). 0-200 every grow old I acknowledge it accomplish the dealer for diagnostics.. upon going problems are truly calculation up. I m in two minds to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car going on this morning, it starts in the works and runs at 1750 and within a minute or correspondingly climbs beyond 2500.. It is direction mild though, just showing off innovative than it should be. I next checked the throttle screw plate/return screw, with intent turned it out and nothing changed. put it back to exactly where it was. No vacuum leak sounds and every contacts verified. I mood good more or less them as I've been in there a bunch of times..
I'm reviewing your ask now, and will publish help in the same way as your reply ASAP. Rgds Greg. What fault codes reach you have. Does the engine run as soon as the MAF disconnected. later than the noisy hissing hermetically sealed this could be your problem. This could be a large vacuum leak ,with the MAF connected it is isolated measuring the air that is getting in imitation of the MAF, suitably if the intake manifold is sucking in ventilate the expose to fuel ratio will be extremely out and cause the engine to stal