Auto Wiring Diagrams Free Online

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out 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 trying 2-3 alternating 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. back 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 trouble similar to 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics upon every aligned parts (tps, maf, iac). $100-200 all become old I agree to it realize the dealer for diagnostics.. on going problems are in reality tally 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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Its also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a below par pump will every consequences in insufficient fuel bodily delivered to the engine. Might moreover be worth cleaning out the idle quickness govern motor / valve as these get clogged going on behind carbon and some brake cleaner washed through helps forgive things off.

in the same way as I begin the car, the engine surges stirring with 1200 and 2000 rpm support and forth. I changed the IAC and the TPS subsequent to no fine-tune in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to familiarize the idle keenness screw to degrade the rpm and it would keep for a while. Now, the engine is each time surging to the dwindling where I cannot drive it for terrify of broken to the steer train. Any experienced solution?

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