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 suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After exasperating 2-3 oscillate 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. back up to the dealer.. this epoch he says, it needs a ECU. I did a lot of research upon them, and found that its a common difficulty behind 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 need to be re-adjusted? The master tech did every sorts of diagnostics on all amalgamated parts (tps, maf, iac). $100-200 every period I take on it attain the dealer for diagnostics.. upon going problems are in reality tallying up. I m hesitant to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its afterward worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a under the weather pump will all result in insufficient fuel mammal delivered to the engine. Might then be worth cleaning out the idle eagerness run motor / valve as these acquire clogged up behind carbon and some brake cleaner washed through helps release things off.
Hello the TPS does have an effect on switching the car into idle mode so I'd suggest to make sure the throttle dish is 100% closed and not slightly high and dry subsequently carbon. and after that become accustomed the TPS appropriately that the IDL fasten is continuous to the E2 pin in the manner of the throttle is closed, and retrieve circuit considering the throttle is just cracked. Don't trouble roughly any voltages, the IDL contact is the in fact important one.
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