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 difficulty that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After a pain 2-3 exchange 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. incite 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 difficulty taking into account 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics on all amalgamated parts (tps, maf, iac). 0-200 all period I take it realize the dealer for diagnostics.. on going problems are in point of fact adding up. I m hesitant to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its as a consequence worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not at your best pump will all repercussion in insufficient fuel living thing delivered to the engine. Might moreover be worth cleaning out the idle quickness control motor / valve as these get clogged going on subsequent to carbon and some brake cleaner washed through helps release things off.
once I begin the car, the engine surges stirring amongst 1200 and 2000 rpm assist and forth. I untouched the IAC and the TPS with no alter in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to adjust the idle rapidity screw to lower the rpm and it would hold for a while. Now, the engine is for eternity surging to the tapering off where I cannot steer it for apprehension of damage to the drive train. Any experienced solution?