Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After infuriating 2-3 exchange 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. support to the dealer.. this era he says, it needs a ECU. I did a lot of research on them, and found that its a common misery in imitation of 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 dependence to be re-adjusted? The master tech did every sorts of diagnostics upon every joined parts (tps, maf, iac). $100-200 all times I allow it pull off the dealer for diagnostics.. upon going problems are essentially adjunct up. I m in two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its then worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will all consequences in insufficient fuel being delivered to the engine. Might with be worth cleaning out the idle readiness direct motor / valve as these acquire clogged happening past carbon and some brake cleaner washed through helps free things off.
I don't have any check engine lights unless I unplug the MAF sensor. afterward the MAF is plugged in after that the car will stall unless I put my foot upon the accelerator. There is afterward an intermittent popping strong coming at idle.
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