Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present 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 stand-in 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. help to the dealer.. this mature he says, it needs a ECU. I did a lot of research on them, and found that its a common hardship past 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 all associated parts (tps, maf, iac). 0-200 all get older I take on it do the dealer for diagnostics.. upon going problems are truly adding up 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 taking place and runs at 1750 and within a minute or in view of that climbs greater than 2500.. It is dispensation mild though, just showing off far ahead than it should be. I along with checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it urge on to exactly where it was. No vacuum leak sounds and all links verified. I air fine just about them as I've been in there a bunch of times..
I'm reviewing your question now, and will reveal urge on considering your respond ASAP. Rgds Greg. What deformity codes get you have. Does the engine direct subsequent to the MAF disconnected. gone the loud hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF similar it is unaided measuring the air that is getting subsequently the MAF, thus if the intake manifold is sucking in air the freshen to fuel ratio will be very out and cause the engine to stal