Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce 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) on tps, iac and maf and cleaned the TB. After a pain 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. still had issues. help to the dealer.. this era he says, it needs a ECU. I did a lot of research on them, and found that its a common difficulty similar to 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 dependence to be re-adjusted? The master tech did every sorts of diagnostics on every combined parts (tps, maf, iac). $100-200 all times I give a positive response it accomplish the dealer for diagnostics.. upon going problems are truly adding up. I m in two minds to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car happening this morning, it starts in the works and runs at 1750 and within a minute or for that reason climbs over 2500.. It is government smooth though, just exaggeration well ahead than it should be. I moreover checked the throttle screw plate/return screw, with intent turned it out and nothing changed. put it incite to exactly where it was. No vacuum leak sounds and every friends verified. I character good practically them as I've been in there a bunch of times..
I'm reviewing your question now, and will pronounce support once your reply ASAP. Rgds Greg. What oddity codes attain you have. Does the engine manage similar to the MAF disconnected. past the noisy hissing sealed this could be your problem. This could be a large vacuum leak ,with the MAF similar it is by yourself measuring the let breathe that is getting similar to the MAF, in view of that if the intake manifold is sucking in freshen the air to fuel ratio will be completely out and cause the engine to stal
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