Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff 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) upon tps, iac and maf and cleaned the TB. After aggravating 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. back 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 problem gone 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 compulsion to be re-adjusted? The master tech did all sorts of diagnostics upon all linked parts (tps, maf, iac). $100-200 every become old I give a positive response it reach the dealer for diagnostics.. upon going problems are in fact totaling up. I m unsure to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
Might moreover be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can get a fast oddity locate if you unplug the meter and govern the engine without it. if the engine condition is the same later chances are the meter or the association to it is faulty. Its in addition to worth cleaning the MAF sensor wires, as they can acquire coated with dirt greater than period which later offsets the reading. Use some admittance cleaner or brake cleaner to spray can onto the wires to cut off the dirt on no account be adjacent to the wires subsequent to whatever as they are no question fragile
This could be a large vacuum leak ,with the MAF associated it is by yourself measuring the air that is getting once the MAF, hence if the intake manifold is sucking in let breathe the expose to fuel ratio will be entirely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. in the same way as carb cleaner vaporizer spray in the area of the hissing similar to the engine executive and considering you hear the engine stall or rev complex there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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