Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to steer 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 aggravating 2-3 every second 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 time he says, it needs a ECU. I did a lot of research upon them, and found that its a common misery in the same way 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 habit to be re-adjusted? The master tech did all sorts of diagnostics on every connected parts (tps, maf, iac). 0-200 every epoch I believe it attain the dealer for diagnostics.. on going problems are in point of fact appendage up. I m undecided to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I'm 1500 too high.. or more. It's boggling to me how this trouble has morphed into various idle problems and has everyone perplexed.. or for that reason it seems. I've been dealing taking into consideration this previously July.. makes me appreciate my 240z 10 times more.My dad owns an sc400 and its been in point of fact good to him.. I'm having a hard times not innate acid in the same way as this purchase. I attain tone taking into account its a fine car though. Motor sounds gorgeous and is super serene past handing out right.
I'm reviewing your question now, and will read out urge on afterward your reply ASAP. Rgds Greg. What irregularity codes accomplish you have. Does the engine govern when the MAF disconnected. in the manner of the loud hissing hermetic this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is lonely measuring the ventilate that is getting taking into consideration the MAF, correspondingly if the intake manifold is sucking in let breathe the let breathe to fuel ratio will be enormously out and cause the engine to stal