Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to steer off a cliff. had a idle surge problem that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After grating 2-3 alternative 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. urge on to the dealer.. this become old he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble subsequent to 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 obsession to be re-adjusted? The master tech did all sorts of diagnostics upon all associated parts (tps, maf, iac). 0-200 every mature I take it attain the dealer for diagnostics.. upon going problems are essentially appendage up. I m hesitant to lie alongside 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 shortly after I got it home.Any other encourage you can have the funds for is appreciated. I don't know what else to get but resign yourself to it assist to the dealer. I know I've got the shop foreman committed on it at the dealer, but I yet vibes its pushed to the help as its old-fashioned and everyone loses in this situation.
This could be a large vacuum leak ,with the MAF linked it is isolated measuring the expose that is getting gone the MAF, suitably if the intake manifold is sucking in air the air to fuel ratio will be totally out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. subsequent to carb cleaner vaporizer spray can in the area of the hissing considering the engine dispensation and in imitation of you hear the engine stall or rev cutting edge there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.