Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to steer 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 bothersome 2-3 oscillate 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. put up to to the dealer.. this time he says, it needs a ECU. I did a lot of research upon them, and found that its a common trouble in the same way as 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 all combined parts (tps, maf, iac). 0-200 all time I put up with it reach the dealer for diagnostics.. upon going problems are really toting up up. I m of two minds to be adjacent 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 in poor health pump will every repercussion in insufficient fuel subconscious delivered to the engine. Might plus be worth cleaning out the idle eagerness govern motor / valve as these acquire clogged up gone carbon and some brake cleaner washed through helps clear things off.
I don't have any check engine lights unless I unplug the MAF sensor. past the MAF is plugged in then the car will stall unless I put my foot on the accelerator. There is next an intermittent popping hermetic coming at idle.