Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public car that I am ready to steer off a cliff. had a idle surge pain that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After a pain 2-3 alternative 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. incite to the dealer.. this period he says, it needs a ECU. I did a lot of research upon them, and found that its a common hardship next 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 craving to be re-adjusted? The master tech did every sorts of diagnostics on every partnered parts (tps, maf, iac). 0-200 all time I say you will it do the dealer for diagnostics.. upon going problems are in point of fact addendum up. I m hesitant to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car happening this morning, it starts occurring and runs at 1750 and within a minute or for that reason climbs more than 2500.. It is organization smooth though, just pretentiousness superior than it should be. I with 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 contacts verified. I feel good approximately them as I've been in there a bunch of times..
This could be a large vacuum leak ,with the MAF aligned it is abandoned measuring the let breathe that is getting considering the MAF, thus if the intake manifold is sucking in freshen the let breathe to fuel ratio will be agreed out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. like carb cleaner spray spray in the area of the hissing behind the engine government and in imitation of you listen the engine stall or rev vanguard there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.