Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops 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) on tps, iac and maf and cleaned the TB. After frustrating 2-3 every second 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. back 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 misfortune considering 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 all connected parts (tps, maf, iac). $100-200 all epoch I take it attain the dealer for diagnostics.. upon going problems are in point of fact calculation up. I m undecided to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its as well as worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a in poor health pump will all repercussion in insufficient fuel living thing delivered to the engine. Might as well as be worth cleaning out the idle promptness rule motor / valve as these get clogged happening afterward carbon and some brake cleaner washed through helps release things off.
taking into consideration I begin the car, the engine surges up amongst 1200 and 2000 rpm back and forth. I tainted the IAC and the TPS with no fine-tune in symptoms. I have noticed that several Lexus SC’s have this thesame issue. Prior to this I would have to get used to the idle promptness screw to humiliate the rpm and it would sustain for a while. Now, the engine is for ever and a day surging to the narrowing where I cannot drive it for terrify of broken to the steer train. Any experienced solution?
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