Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push car that I am ready to drive off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After a pain 2-3 substitute 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 time he says, it needs a ECU. I did a lot of research upon them, and found that its a common trouble next 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics on all united parts (tps, maf, iac). 0-200 every mature I agree to it pull off the dealer for diagnostics.. upon going problems are in reality tallying up. I m of two minds to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a under the weather pump will all repercussion in insufficient fuel bodily delivered to the engine. Might next be worth cleaning out the idle rapidity manage motor / valve as these get clogged taking place past carbon and some brake cleaner washed through helps release things off.
I don't have any check engine lights unless I unplug the MAF sensor. once the MAF is plugged in later the car will stall unless I put my foot upon the accelerator. There is along with an intermittent popping sealed coming at idle.