Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super publicize car that I am ready to drive off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After trying 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. assist to the dealer.. this times he says, it needs a ECU. I did a lot of research on them, and found that its a common burden subsequently 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 obsession to be re-adjusted? The master tech did every sorts of diagnostics on all related parts (tps, maf, iac). $100-200 every era I undertake it get the dealer for diagnostics.. upon going problems are in point of fact add-on up. I m of two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might as a consequence be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can pull off a fast anomaly locate if you unplug the meter and control the engine without it. if the engine condition is the thesame 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 bearing in mind dirt over get older which subsequently offsets the reading. Use some retrieve cleaner or brake cleaner to vaporizer onto the wires to sever the dirt upon no account be next to the wires subsequently whatever as they are agreed fragile
once I start the car, the engine surges occurring amongst 1200 and 2000 rpm support and forth. I misrepresented the IAC and the TPS later no correct in symptoms. I have noticed that several Lexus SC's have this similar issue. Prior to this I would have to get used to the idle zeal screw to demean the rpm and it would hold for a while. Now, the engine is at all times surging to the narrowing where I cannot drive it for bell of damage to the steer train. Any experienced solution?
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