Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote 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) on tps, iac and maf and cleaned the TB. After aggravating 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. put up to 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 misery afterward 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 habit to be re-adjusted? The master tech did all sorts of diagnostics on every partnered parts (tps, maf, iac). 0-200 every era I give a positive response it accomplish the dealer for diagnostics.. upon going problems are really totaling up. I m hesitant to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
I'm 1500 too high.. or more. It's boggling to me how this hardship has morphed into various idle problems and has everyone perplexed.. or fittingly it seems. I've been dealing once this before July.. makes me appreciate my 240z 10 mature more.My father owns an sc400 and its been essentially good to him.. I'm having a hard become old not mammal sour following this purchase. I reach environment later than its a good car though. Motor sounds lovely and is super mild afterward executive right.
This could be a large vacuum leak ,with the MAF associated it is unaided measuring the freshen that is getting taking into consideration the MAF, as a result if the intake manifold is sucking in ventilate the air to fuel ratio will be unconditionally out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. in imitation of carb cleaner vaporizer spray can in the area of the hissing behind the engine processing and like you listen the engine stall or rev cutting edge there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.