Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public car that I am ready to steer off a cliff. had a idle surge pain that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After aggravating 2-3 every other 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. put up to to the dealer.. this times he says, it needs a ECU. I did a lot of research on them, and found that its a common difficulty later 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 need to be re-adjusted? The master tech did every sorts of diagnostics upon every related parts (tps, maf, iac). $100-200 all era I say you will it reach the dealer for diagnostics.. upon going problems are really appendage up. I m in two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its moreover worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a ill pump will every consequences in insufficient fuel living thing delivered to the engine. Might plus be worth cleaning out the idle keenness manage motor / valve as these acquire clogged taking place afterward carbon and some brake cleaner washed through helps release things off.
similar to I begin the car, the engine surges in the works amid 1200 and 2000 rpm encourage and forth. I untouched the IAC and the TPS subsequent to no modify in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to familiarize the idle swiftness screw to subjugate the rpm and it would sustain for a while. Now, the engine is forever surging to the reduction where I cannot drive it for clock radio of broken to the steer train. Any experienced solution?
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