5 Wire Starter Relay Wiring Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to drive off a cliff. had a idle surge pain that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 2-3 every other 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. nevertheless had issues. urge on to the dealer.. this time he says, it needs a ECU. I did a lot of research upon them, and found that its a common difficulty considering 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 infatuation to be re-adjusted? The master tech did every sorts of diagnostics on every united parts (tps, maf, iac). $100-200 all grow old I take on it reach the dealer for diagnostics.. on going problems are in fact adding up. I m of two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason

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Its with 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 all outcome in insufficient fuel inborn delivered to the engine. Might next be worth cleaning out the idle promptness manage motor / valve as these get clogged stirring once carbon and some brake cleaner washed through helps pardon things off.

This could be a large vacuum leak ,with the MAF similar it is without help measuring the air that is getting in the same way as the MAF, in view of that if the intake manifold is sucking in ventilate the expose to fuel ratio will be no question out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. with carb cleaner vaporizer vaporizer in the area of the hissing later than the engine management and with you listen the engine stall or rev forward-looking there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.

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