Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops 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 maddening 2-3 rotate 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 upon them, and found that its a common misery following 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 craving to be re-adjusted? The master tech did all sorts of diagnostics on all connected parts (tps, maf, iac). 0-200 every epoch I say you will it do the dealer for diagnostics.. on going problems are essentially tallying up. I m undecided to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its furthermore worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not a hundred percent pump will all outcome in insufficient fuel being delivered to the engine. Might furthermore be worth cleaning out the idle enthusiasm direct motor / valve as these get clogged stirring subsequently carbon and some brake cleaner washed through helps forgive things off.
I don't have any check engine lights unless I unplug the MAF sensor. as soon as the MAF is plugged in next the car will stall unless I put my foot upon the accelerator. There is moreover an intermittent popping strong coming at idle.