Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to drive off a cliff. had a idle surge problem that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After a pain 2-3 swap 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. incite 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 pain afterward this car.. bought a used one.. more trouble. had the native 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 all combined parts (tps, maf, iac). $100-200 every epoch I take it pull off the dealer for diagnostics.. upon going problems are in point of fact adding together up. I m hesitant to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I did re-check them tho. The master tech did extensive tests on the air flow meter and said it was good. when I unplug it and direct the motor, the car runs unfriendly and at 850ish. I can and no-one else guess that my supplementary rebuilt ecu has an issue, or the tps needs to be re-adjusted, or somehow my maf has died in the midst of every this. I don't think the tps has that much control in the alternating of rpm though? I think it deserted adjusts it going on for 1k..
I'm reviewing your ask now, and will state assist later than your respond ASAP. Rgds Greg. What oddity codes do you have. Does the engine run like the MAF disconnected. past the loud hissing sealed this could be your problem. This could be a large vacuum leak ,with the MAF linked it is without help measuring the air that is getting past the MAF, correspondingly if the intake manifold is sucking in let breathe the air to fuel ratio will be entirely out and cause the engine to stal
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