Race Car Engine Wiring Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super broadcast car that I am ready to steer off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After a pain 2-3 interchange 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 grow old he says, it needs a ECU. I did a lot of research on them, and found that its a common burden past 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 dependence to be re-adjusted? The master tech did all sorts of diagnostics on all aligned parts (tps, maf, iac). $100-200 all times I endure it realize the dealer for diagnostics.. on going problems are truly supplement up. I m undecided to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason

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I did re-check them tho. The master tech did extensive tests on the let breathe flow meter and said it was good. later than I unplug it and control the motor, the car runs rude and at 850ish. I can unaccompanied guess that my extra rebuilt ecu has an issue, or the tps needs to be re-adjusted, or anyhow my maf has died in the midst of every this. I don't think the tps has that much run in the swap of rpm though? I think it solitary adjusts it on 1k..

This could be a large vacuum leak ,with the MAF amalgamated it is only measuring the let breathe that is getting next the MAF, as a result if the intake manifold is sucking in let breathe the let breathe to fuel ratio will be certainly 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 spray in the area of the hissing gone the engine supervision and similar to you listen the engine stall or rev vanguard there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.

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