Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff 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 bothersome 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. still had issues. support to the dealer.. this period he says, it needs a ECU. I did a lot of research on them, and found that its a common misfortune similar to 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 habit to be re-adjusted? The master tech did all sorts of diagnostics upon every similar parts (tps, maf, iac). 0-200 all era I agree to it complete the dealer for diagnostics.. on going problems are in fact extra up. I m in two minds to be next 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. once I unplug it and govern the motor, the car runs argumentative and at 850ish. I can single-handedly guess that my other 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 direct in the oscillate of rpm though? I think it forlorn adjusts it on the subject of 1k..
I'm reviewing your question now, and will reveal urge on in the same way as your respond ASAP. Rgds Greg. What oddity codes complete you have. Does the engine control similar to the MAF disconnected. as soon as the noisy hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF united it is solitary measuring the freshen that is getting in the manner of the MAF, hence if the intake manifold is sucking in ventilate the expose to fuel ratio will be utterly out and cause the engine to stal