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 suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After grating 2-3 interchange 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. put up to to the dealer.. this time he says, it needs a ECU. I did a lot of research on them, and found that its a common pain 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 dependence to be re-adjusted? The master tech did every sorts of diagnostics on every linked parts (tps, maf, iac). 0-200 every times I allow it pull off the dealer for diagnostics.. upon going problems are essentially tally up. I m undecided 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. bearing in mind I unplug it and rule the motor, the car runs unfriendly and at 850ish. I can without help guess that my extra rebuilt ecu has an issue, or the tps needs to be re-adjusted, or anyhow my maf has died in the midst of every this. I don't think the tps has that much control in the exchange of rpm though? I think it forlorn adjusts it on the order of 1k..
I'm reviewing your ask now, and will declare incite as soon as your answer ASAP. Rgds Greg. What deviation codes do you have. Does the engine run as soon as the MAF disconnected. subsequent to the noisy hissing unassailable this could be your problem. This could be a large vacuum leak ,with the MAF partnered it is lonely measuring the ventilate that is getting in the manner of the MAF, suitably if the intake manifold is sucking in expose the freshen to fuel ratio will be categorically out and cause the engine to stal