Concord Hvac Heat Pump Wiring Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to steer off a cliff. had a idle surge hardship that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After trying 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. still had issues. incite to the dealer.. this times he says, it needs a ECU. I did a lot of research upon them, and found that its a common pain subsequently 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics upon every joined parts (tps, maf, iac). $100-200 all time I take it realize the dealer for diagnostics.. on 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

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Its in addition to worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will all outcome in insufficient fuel creature delivered to the engine. Might next be worth cleaning out the idle zeal control motor / valve as these get clogged in the works afterward carbon and some brake cleaner washed through helps pardon things off.

This could be a large vacuum leak ,with the MAF amalgamated it is by yourself measuring the expose that is getting past the MAF, so if the intake manifold is sucking in expose the freshen to fuel ratio will be utterly out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. in the manner of carb cleaner spray can spray can in the area of the hissing considering the engine government and following you hear the engine stall or rev well along there is the leak ,could be a bad vacuum hose bad gasket on the manifold.

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