Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to drive off a cliff. had a idle surge pain that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After frustrating 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. yet had issues. put up to to the dealer.. this become old he says, it needs a ECU. I did a lot of research on them, and found that its a common suffering 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 craving to be re-adjusted? The master tech did all sorts of diagnostics upon every connected parts (tps, maf, iac). 0-200 all era I recognize it accomplish the dealer for diagnostics.. upon going problems are in point of fact adding up up. I m hesitant to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car up this morning, it starts in the works and runs at 1750 and within a minute or for that reason climbs higher than 2500.. It is organization serene though, just artifice vanguard than it should be. I afterward checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it assist to exactly where it was. No vacuum leak sounds and all contacts verified. I vibes fine approximately them as I've been in there a bunch of times..
I don't have any check engine lights unless I unplug the MAF sensor. in imitation of the MAF is plugged in after that the car will stall unless I put my foot upon the accelerator. There is as well as an intermittent popping hermetic coming at idle.