Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to steer off a cliff. had a idle surge hardship that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 2-3 every second 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. put up to to the dealer.. this epoch he says, it needs a ECU. I did a lot of research on them, and found that its a common suffering 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 craving to be re-adjusted? The master tech did all sorts of diagnostics upon every linked parts (tps, maf, iac). $100-200 every become old I consent it attain the dealer for diagnostics.. upon going problems are essentially supplement up. I m of two minds to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I bought it in July, drove it house from LA (to Utah), and the problems started tersely after I got it home.Any new put up to you can meet the expense of is appreciated. I don't know what else to accomplish but take it assist to the dealer. I know I've got the shop foreman working on it at the dealer, but I still atmosphere its pushed to the urge on as its outdated and everyone loses in this situation.
This could be a large vacuum leak ,with the MAF connected it is unaccompanied measuring the ventilate that is getting later than the MAF, as a result if the intake manifold is sucking in air the ventilate to fuel ratio will be definitely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. afterward carb cleaner spray vaporizer in the place of the hissing past the engine organization and as soon as you listen the engine stall or rev difficult there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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