Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast car that I am ready to drive 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 maddening 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. assist to the dealer.. this period he says, it needs a ECU. I did a lot of research upon them, and found that its a common pain subsequently this car.. bought a used one.. more trouble. had the native 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 partnered parts (tps, maf, iac). $100-200 all time I take it get the dealer for diagnostics.. upon going problems are in fact count up. I m undecided to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car happening this morning, it starts stirring and runs at 1750 and within a minute or so climbs beyond 2500.. It is direction smooth though, just exaggeration well along than it should be. I after that checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it assist to exactly where it was. No vacuum leak sounds and all connections verified. I mood 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 in view of that I'd suggest to create certain the throttle dish is 100% closed and not slightly ashore when carbon. and after that adjust the TPS in view of that that the IDL stick is continuous to the E2 attach similar to the throttle is closed, and right to use circuit similar to the throttle is just cracked. Don't bother about any voltages, the IDL retrieve is the in reality important one.
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