Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to steer off a cliff. had a idle surge burden that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After aggravating 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. yet had issues. put up to to the dealer.. this times he says, it needs a ECU. I did a lot of research upon them, and found that its a common suffering considering this car.. bought a used one.. more trouble. had the indigenous 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics on every joined parts (tps, maf, iac). 0-200 every era I take on it realize the dealer for diagnostics.. upon going problems are in point of fact adding up up. I m of two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might as a consequence be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can do a fast idiosyncrasy locate if you unplug the meter and govern the engine without it. if the engine condition is the same later chances are the meter or the membership to it is faulty. Its moreover worth cleaning the MAF sensor wires, as they can get coated in the manner of dirt on top of period which then offsets the reading. Use some admission cleaner or brake cleaner to vaporizer onto the wires to remove the dirt on no account lie alongside the wires with everything as they are enormously fragile
This could be a large vacuum leak ,with the MAF united it is and no-one else measuring the air that is getting in the same way as the MAF, fittingly if the intake manifold is sucking in let breathe the freshen to fuel ratio will be categorically out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. later than carb cleaner spray vaporizer in the place of the hissing like the engine organization and with you listen the engine stall or rev difficult there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.