Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market car that I am ready to drive off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After bothersome 2-3 exchange 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 times he says, it needs a ECU. I did a lot of research on them, and found that its a common burden next 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 linked parts (tps, maf, iac). 0-200 every become old I believe it attain the dealer for diagnostics.. upon going problems are really adjunct up. I m undecided to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car taking place this morning, it starts in the works and runs at 1750 and within a minute or suitably climbs higher than 2500.. It is processing serene though, just mannerism higher than it should be. I also checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it support to exactly where it was. No vacuum leak sounds and every connections verified. I quality fine just about them as I've been in there a bunch of times..
Hello the TPS does have an effect on switching the car into idle mode suitably I'd suggest to create sure the throttle plate is 100% closed and not slightly beached as soon as carbon. and subsequently familiarize the TPS fittingly that the IDL glue is continuous to the E2 stick as soon as the throttle is closed, and entry circuit later than the throttle is just cracked. Don't worry more or less any voltages, the IDL way in is the in point of fact important one.