Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to steer off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After maddening 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. still had issues. assist 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 burden past 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics upon all related parts (tps, maf, iac). $100-200 every period I acknowledge it do the dealer for diagnostics.. on going problems are really adding up 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 ventilate flow meter and said it was good. in the same way as I unplug it and direct the motor, the car runs coarse and at 850ish. I can without help guess that my other rebuilt ecu has an issue, or the tps needs to be re-adjusted, or anyhow my maf has died in the midst of all this. I don't think the tps has that much manage in the stand-in of rpm though? I think it lonely adjusts it roughly 1k..
Hello the TPS does have an effect upon switching the car into idle mode suitably I'd recommend to create positive the throttle dish is 100% closed and not slightly grounded as soon as carbon. and subsequently accustom yourself the TPS for that reason that the IDL fix is continuous to the E2 fasten taking into account the throttle is closed, and approach circuit next the throttle is just cracked. Don't worry not quite any voltages, the IDL entrance is the in fact important one.
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