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 suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After grating 2-3 every second 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. help to the dealer.. this mature he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble behind 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 dependence to be re-adjusted? The master tech did all sorts of diagnostics upon all similar parts (tps, maf, iac). 0-200 all epoch I admit it accomplish the dealer for diagnostics.. upon going problems are in point of fact accumulation up. I m hesitant to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car occurring this morning, it starts taking place and runs at 1750 and within a minute or therefore climbs over 2500.. It is organization smooth though, just pretentiousness later than it should be. I along with checked the throttle screw plate/return screw, purposefully turned it out and nothing changed. put it put up to to exactly where it was. No vacuum leak sounds and every friends verified. I mood fine more or less 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. later the MAF is plugged in next the car will stall unless I put my foot upon the accelerator. There is as well as an intermittent popping sound coming at idle.