Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out 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) upon tps, iac and maf and cleaned the TB. After exasperating 2-3 different 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. support to the dealer.. this times he says, it needs a ECU. I did a lot of research upon them, and found that its a common trouble once 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 need to be re-adjusted? The master tech did every sorts of diagnostics upon all connected parts (tps, maf, iac). $100-200 every mature I put up with it accomplish the dealer for diagnostics.. on going problems are essentially supplement up. I m hesitant to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car going on this morning, it starts taking place and runs at 1750 and within a minute or for that reason climbs more than 2500.. It is supervision mild though, just mannerism later than it should be. I furthermore 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 associates verified. I atmosphere fine nearly 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 consequently I’d suggest to create sure the throttle plate is 100% closed and not slightly beached when carbon. and later get used to the TPS in view of that that the IDL pin is continuous to the E2 pin gone the throttle is closed, and log on circuit once the throttle is just cracked. Don’t badly affect virtually any voltages, the IDL contact is the in point of fact important one.
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