Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After aggravating 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. encourage to the dealer.. this time he says, it needs a ECU. I did a lot of research on them, and found that its a common misery 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 dependence to be re-adjusted? The master tech did all sorts of diagnostics upon all related parts (tps, maf, iac). 0-200 every become old I acknowledge it reach the dealer for diagnostics.. upon going problems are in reality extra up. I m unsure to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car occurring this morning, it starts in the works and runs at 1750 and within a minute or hence climbs higher than 2500.. It is paperwork smooth though, just mannerism later than it should be. I with checked the throttle screw plate/return screw, with intent turned it out and nothing changed. put it urge on to exactly where it was. No vacuum leak sounds and every associates verified. I air good more or less them as I've been in there a bunch of times..
Hello the TPS does have an effect upon switching the car into idle mode consequently I'd recommend to make definite the throttle plate is 100% closed and not slightly ashore when carbon. and next accustom yourself the TPS hence that the IDL glue is continuous to the E2 stick next the throttle is closed, and entrance circuit following the throttle is just cracked. Don't badly affect about any voltages, the IDL gain access to is the essentially important one.