Alfa Romeo 4c Engine Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super announce car that I am ready to drive off a cliff. had a idle surge burden that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After irritating 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. nevertheless had issues. help 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 misery as soon as this car.. bought a used one.. more trouble. had the indigenous 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 all sorts of diagnostics upon every joined parts (tps, maf, iac). $100-200 all epoch I assume it pull off the dealer for diagnostics.. on going problems are truly accumulation up. I m unsure to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason


I did re-check them tho. The master tech did extensive tests upon the let breathe flow meter and said it was good. in imitation of I unplug it and run the motor, the car runs rasping and at 850ish. I can solitary 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 rule in the exchange of rpm though? I think it by yourself adjusts it almost 1k..

gone I begin the car, the engine surges stirring amid 1200 and 2000 rpm assist and forth. I untouched the IAC and the TPS with no amend in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to adjust the idle eagerness screw to subjugate the rpm and it would preserve for a while. Now, the engine is constantly surging to the dwindling where I cannot drive it for alarm clock of broken to the steer train. Any experienced solution?

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