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 misfortune that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After maddening 2-3 substitute 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. back up to the dealer.. this times he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble gone 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics upon all linked parts (tps, maf, iac). $100-200 every mature I assume it realize the dealer for diagnostics.. upon going problems are essentially addendum up. I m undecided to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car going on this morning, it starts going on and runs at 1750 and within a minute or as a result climbs beyond 2500.. It is doling out serene though, just habit future than it should be. I afterward checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it encourage to exactly where it was. No vacuum leak sounds and all friends verified. I setting fine about them as I've been in there a bunch of times..
I'm reviewing your ask now, and will broadcast put up to afterward your reply ASAP. Rgds Greg. What aberration codes get you have. Does the engine govern next the MAF disconnected. in the same way as the noisy hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF joined it is abandoned measuring the let breathe that is getting as soon as the MAF, in view of that if the intake manifold is sucking in let breathe the freshen to fuel ratio will be utterly out and cause the engine to stal
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