Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce 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 trying 2-3 oscillate 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. nevertheless had issues. back up to the dealer.. this epoch he says, it needs a ECU. I did a lot of research upon them, and found that its a common misfortune 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 upon every joined parts (tps, maf, iac). 0-200 all epoch I acknowledge it get the dealer for diagnostics.. upon going problems are in reality totaling up. I m undecided to be adjacent to 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. gone I unplug it and control the motor, the car runs rude and at 850ish. I can lonesome guess that my other 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 different of rpm though? I think it and no-one else adjusts it on the subject of 1k..
I'm reviewing your question now, and will declare encourage gone your reply ASAP. Rgds Greg. What deviation codes do you have. Does the engine rule subsequent to the MAF disconnected. as soon as the noisy hissing sealed this could be your problem. This could be a large vacuum leak ,with the MAF amalgamated it is lonesome measuring the ventilate that is getting gone the MAF, correspondingly if the intake manifold is sucking in ventilate the air to fuel ratio will be very out and cause the engine to stal