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) upon tps, iac and maf and cleaned the TB. After infuriating 2-3 substitute 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. assist to the dealer.. this era he says, it needs a ECU. I did a lot of research upon them, and found that its a common burden once 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 craving to be re-adjusted? The master tech did all sorts of diagnostics upon every combined parts (tps, maf, iac). $100-200 all get older I believe it pull off the dealer for diagnostics.. upon going problems are in point of fact tally up. I m in two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its furthermore worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not a hundred percent pump will every repercussion in insufficient fuel bodily delivered to the engine. Might furthermore be worth cleaning out the idle readiness govern motor / valve as these get clogged going on later than carbon and some brake cleaner washed through helps free things off.
considering I begin the car, the engine surges going on together with 1200 and 2000 rpm assist and forth. I changed the IAC and the TPS gone no amend in symptoms. I have noticed that several Lexus SC’s have this similar issue. Prior to this I would have to get used to the idle quickness screw to lower the rpm and it would support for a while. Now, the engine is each time surging to the dwindling where I cannot drive it for alarm bell of broken to the drive train. Any experienced solution?
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