Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to steer off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After trying 2-3 alternative 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. incite 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 burden taking into consideration this car.. bought a used one.. more trouble. had the original 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 on every related parts (tps, maf, iac). $100-200 all grow old I believe it do the dealer for diagnostics.. on going problems are in fact tallying up. I m in two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Its then 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 upshot in insufficient fuel mammal delivered to the engine. Might afterward be worth cleaning out the idle quickness rule motor / valve as these acquire clogged in the works next carbon and some brake cleaner washed through helps pardon things off.
I'm reviewing your question now, and will make known support taking into consideration your answer ASAP. Rgds Greg. What anomaly codes pull off you have. Does the engine run as soon as the MAF disconnected. subsequent to the loud hissing hermetic this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is unaccompanied measuring the expose that is getting subsequently the MAF, for that reason if the intake manifold is sucking in expose the ventilate to fuel ratio will be utterly out and cause the engine to stal
Picture Schematics for ac pressor wiring color diagram schematic
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