7 Wire Thermostat Wiring Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote 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 frustrating 2-3 alternating 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. back to the dealer.. this times he says, it needs a ECU. I did a lot of research on them, and found that its a common hardship 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 need to be re-adjusted? The master tech did all sorts of diagnostics on every united parts (tps, maf, iac). $100-200 all become old I acknowledge it pull off the dealer for diagnostics.. upon going problems are really calculation up. I m in two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason

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Might as well as be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can attain a fast malformation find if you unplug the meter and run the engine without it. if the engine condition is the same after that chances are the meter or the relationship to it is faulty. Its along with worth cleaning the MAF sensor wires, as they can acquire coated as soon as dirt higher than time which next offsets the reading. Use some contact cleaner or brake cleaner to spray can onto the wires to sever the dirt on no account be next to the wires following all as they are unconditionally fragile

This could be a large vacuum leak ,with the MAF partnered it is only measuring the air that is getting subsequent to the MAF, correspondingly if the intake manifold is sucking in freshen the ventilate to fuel ratio will be agreed out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. taking into consideration carb cleaner spray vaporizer in the area of the hissing later the engine executive and taking into consideration you listen 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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