Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to drive off a cliff. had a idle surge problem that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 2-3 swap 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. yet had issues. put up to to the dealer.. this get older he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble taking into consideration 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 every sorts of diagnostics upon every partnered parts (tps, maf, iac). $100-200 all era I consent it do the dealer for diagnostics.. on going problems are really adjunct up. I m unsure to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me say you a little more about the pain history. It currently has a master tech qualified idle ventilate direct valve and tps installed. without moving anything, the last (used) ecu and my original, would rule in the car without this symptom.
I'm reviewing your ask now, and will declare back up taking into account your answer ASAP. Rgds Greg. What fault codes realize you have. Does the engine manage considering the MAF disconnected. next the loud hissing sealed this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is forlorn measuring the freshen that is getting bearing in mind the MAF, hence if the intake manifold is sucking in air the freshen to fuel ratio will be categorically out and cause the engine to stal
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