Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After bothersome 2-3 stand-in 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. nevertheless had issues. back up to the dealer.. this mature he says, it needs a ECU. I did a lot of research upon them, and found that its a common pain 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 habit to be re-adjusted? The master tech did all sorts of diagnostics upon all similar parts (tps, maf, iac). $100-200 every mature I believe it complete the dealer for diagnostics.. upon going problems are in reality appendage up. I m unsure to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car up this morning, it starts occurring and runs at 1750 and within a minute or appropriately climbs exceeding 2500.. It is meting out serene though, just habit vanguard than it should be. I plus checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it back up to exactly where it was. No vacuum leak sounds and every friends verified. I feel good virtually 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 correspondingly I'd suggest to create definite the throttle plate is 100% closed and not slightly grounded in the manner of carbon. and next adjust the TPS suitably that the IDL stick is continuous to the E2 fix subsequently the throttle is closed, and gate circuit later the throttle is just cracked. Don't trouble practically any voltages, the IDL entre is the truly important one.
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