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 misfortune that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After bothersome 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. yet had issues. incite to the dealer.. this mature he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem behind this car.. bought a used one.. more trouble. had the original 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 dependence to be re-adjusted? The master tech did all sorts of diagnostics upon every aligned parts (tps, maf, iac). 0-200 all get older I endure it complete the dealer for diagnostics.. on going problems are in point of fact accumulation up. I m undecided to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car in the works this morning, it starts in the works and runs at 1750 and within a minute or thus climbs over 2500.. It is management serene though, just pretentiousness well ahead than it should be. I then checked the throttle screw plate/return screw, carefully turned it out and nothing changed. put it encourage to exactly where it was. No vacuum leak sounds and all connections verified. I vibes good nearly them as I've been in there a bunch of times..
I'm reviewing your ask now, and will read out help in imitation of your respond ASAP. Rgds Greg. What malfunction codes complete you have. Does the engine govern next the MAF disconnected. next the noisy hissing sound this could be your problem. This could be a large vacuum leak ,with the MAF related it is by yourself measuring the air that is getting subsequent to the MAF, hence if the intake manifold is sucking in freshen the freshen to fuel ratio will be extremely out and cause the engine to stal