Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to steer off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After bothersome 2-3 vary 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. incite to the dealer.. this time he says, it needs a ECU. I did a lot of research upon them, and found that its a common hardship like 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 craving to be re-adjusted? The master tech did all sorts of diagnostics upon every similar parts (tps, maf, iac). $100-200 all era I acknowledge it get the dealer for diagnostics.. upon going problems are really totaling up. I m in two minds to lie alongside the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Might along with be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can attain a fast anomaly find if you unplug the meter and rule the engine without it. if the engine condition is the similar after that chances are the meter or the attachment to it is faulty. Its furthermore worth cleaning the MAF sensor wires, as they can acquire coated as soon as dirt beyond era which after that offsets the reading. Use some gain access to cleaner or brake cleaner to spray can onto the wires to sever the dirt on no account lie alongside the wires subsequently anything as they are very fragile
in imitation of I start the car, the engine surges going on amongst 1200 and 2000 rpm assist and forth. I tainted the IAC and the TPS like no modify in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to adapt the idle quickness screw to degrade the rpm and it would support for a while. Now, the engine is continuously surging to the narrowing where I cannot drive it for panic of damage to the drive train. Any experienced solution?
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