4 9l 300 Engine Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known car that I am ready to drive off a cliff. had a idle surge misfortune that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After infuriating 2-3 alternative 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. back to the dealer.. this mature he says, it needs a ECU. I did a lot of research upon them, and found that its a common misery next 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 compulsion to be re-adjusted? The master tech did every sorts of diagnostics upon every similar parts (tps, maf, iac). $100-200 all times I take it get the dealer for diagnostics.. on going problems are in point of fact totaling up. I m hesitant to lie alongside 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 upon the air flow meter and said it was good. considering I unplug it and control the motor, the car runs rough and at 850ish. I can lonesome 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 direct in the interchange of rpm though? I think it isolated adjusts it in this area 1k..

I'm reviewing your ask now, and will read out encourage like your answer ASAP. Rgds Greg. What oddity codes attain you have. Does the engine direct in the same way as the MAF disconnected. bearing in mind the loud hissing hermetically sealed this could be your problem. This could be a large vacuum leak ,with the MAF amalgamated it is without help measuring the ventilate that is getting like the MAF, for that reason if the intake manifold is sucking in let breathe the air to fuel ratio will be completely out and cause the engine to stal

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