Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After bothersome 2-3 every other 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 period he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble in the same way as 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics on all partnered parts (tps, maf, iac). $100-200 every mature I give a positive response it do the dealer for diagnostics.. on going problems are essentially appendage up. I m undecided to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might plus be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can realize a quick fault find if you unplug the meter and govern the engine without it. if the engine condition is the similar next chances are the meter or the association to it is faulty. Its afterward worth cleaning the MAF sensor wires, as they can acquire coated gone dirt beyond become old which then offsets the reading. Use some contact cleaner or brake cleaner to spray can onto the wires to separate the dirt on no account lie alongside the wires later everything as they are very fragile
Hello the TPS does have an effect on switching the car into idle mode hence I'd suggest to create determined the throttle dish is 100% closed and not slightly grounded later than carbon. and after that familiarize the TPS suitably that the IDL pin is continuous to the E2 attach later than the throttle is closed, and open circuit bearing in mind the throttle is just cracked. Don't badly affect practically any voltages, the IDL retrieve is the in reality important one.
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