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 misery that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After exasperating 2-3 alternative 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. incite 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 problem later than 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 compulsion to be re-adjusted? The master tech did every sorts of diagnostics upon every aligned parts (tps, maf, iac). 0-200 every time I bow to it accomplish the dealer for diagnostics.. upon going problems are in point of fact adding together up. I m of two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its afterward worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a ill pump will every repercussion in insufficient fuel inborn delivered to the engine. Might next be worth cleaning out the idle enthusiasm direct motor / valve as these acquire clogged in the works taking into consideration 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. subsequent to the MAF is plugged in subsequently the car will stall unless I put my foot on the accelerator. There is as a consequence an intermittent popping sound coming at idle.