Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to drive 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 infuriating 2-3 every second 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. encourage to the dealer.. this grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common difficulty subsequently 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 all related parts (tps, maf, iac). 0-200 all period I give a positive response it do the dealer for diagnostics.. on going problems are truly appendage up. I m unsure to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I bought it in July, drove it house from LA (to Utah), and the problems started rapidly after I got it home.Any further support you can manage to pay for is appreciated. I don't know what else to accomplish but believe it urge on to the dealer. I know I've got the shop foreman operational on it at the dealer, but I nevertheless quality its pushed to the encourage as its dated and everyone loses in this situation.
This could be a large vacuum leak ,with the MAF linked it is on your own measuring the ventilate that is getting in the same way as the MAF, hence 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. similar to carb cleaner spray can spray can in the area of the hissing considering the engine handing out and in imitation of you hear the engine stall or rev difficult there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.