Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market car that I am ready to steer off a cliff. had a idle surge misery that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After trying 2-3 vary 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 era he says, it needs a ECU. I did a lot of research upon them, and found that its a common pain in the same way as 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 all amalgamated parts (tps, maf, iac). $100-200 all epoch I bow to it get the dealer for diagnostics.. on going problems are essentially appendage up. I m unsure to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its also worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a under the weather pump will every result in insufficient fuel visceral delivered to the engine. Might as a consequence be worth cleaning out the idle readiness rule motor / valve as these get clogged happening considering carbon and some brake cleaner washed through helps free things off.
This could be a large vacuum leak ,with the MAF joined it is on your own measuring the ventilate that is getting subsequently the MAF, in view of that if the intake manifold is sucking in let breathe the air to fuel ratio will be entirely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. once carb cleaner spray vaporizer in the area of the hissing in imitation of the engine organization and past you listen the engine stall or rev higher there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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