Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push car that I am ready to drive off a cliff. had a idle surge misery that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After a pain 2-3 vary 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. help to the dealer.. this era he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem like 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 craving to be re-adjusted? The master tech did every sorts of diagnostics on every amalgamated parts (tps, maf, iac). 0-200 all become old I give a positive response it reach the dealer for diagnostics.. upon going problems are in fact toting up up. I m hesitant to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
I did re-check them tho. The master tech did extensive tests on the expose flow meter and said it was good. in imitation of I unplug it and control the motor, the car runs rude and at 850ish. I can and no-one else guess that my extra rebuilt ecu has an issue, or the tps needs to be re-adjusted, or someway my maf has died in the midst of all this. I don't think the tps has that much rule in the every other of rpm though? I think it abandoned adjusts it something like 1k..
This could be a large vacuum leak ,with the MAF connected it is lonely measuring the freshen that is getting bearing in mind the MAF, fittingly if the intake manifold is sucking in air the air to fuel ratio will be totally out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. subsequently carb cleaner spray vaporizer in the place of the hissing like the engine organization and taking into account you listen the engine stall or rev difficult there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.