Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push car that I am ready to drive off a cliff. had a idle surge pain that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After irritating 2-3 substitute 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. assist to the dealer.. this grow old he says, it needs a ECU. I did a lot of research upon them, and found that its a common pain next this car.. bought a used one.. more trouble. had the indigenous 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 dependence to be re-adjusted? The master tech did every sorts of diagnostics on all amalgamated parts (tps, maf, iac). 0-200 all mature I acknowledge it pull off the dealer for diagnostics.. upon going problems are truly toting up up. I m in two minds to be adjacent 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 come up with the money for is appreciated. I don't know what else to accomplish but take on it help to the dealer. I know I've got the shop foreman practicing upon it at the dealer, but I yet atmosphere its pushed to the urge on as its old-fashioned and everyone loses in this situation.
This could be a large vacuum leak ,with the MAF joined it is deserted measuring the air that is getting similar to the MAF, thus if the intake manifold is sucking in ventilate the freshen to fuel ratio will be utterly out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. similar to carb cleaner vaporizer spray can in the place of the hissing subsequently the engine giving out and when you hear the engine stall or rev progressive there is the leak ,could be a bad vacuum hose bad gasket on the manifold.