Hvac Split System Wiring

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to drive off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After a pain 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. yet had issues. back up to the dealer.. this time he says, it needs a ECU. I did a lot of research on them, and found that its a common problem subsequently this car.. bought a used one.. more trouble. had the indigenous 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 all sorts of diagnostics upon every related parts (tps, maf, iac). $100-200 every become old I believe it attain the dealer for diagnostics.. upon going problems are in fact surcharge up. I m of two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason

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Its plus worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not at your best pump will all repercussion in insufficient fuel innate delivered to the engine. Might in addition to be worth cleaning out the idle swiftness control motor / valve as these acquire clogged up taking into consideration carbon and some brake cleaner washed through helps free things off.

This could be a large vacuum leak ,with the MAF linked it is lonely measuring the freshen that is getting once the MAF, for that reason if the intake manifold is sucking in freshen the ventilate to fuel ratio will be enormously out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. behind carb cleaner spray spray in the area of the hissing like the engine paperwork and past you hear the engine stall or rev later there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.

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