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 misery that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 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. yet had issues. back up to the dealer.. this mature he says, it needs a ECU. I did a lot of research upon them, and found that its a common misery in the manner of 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 every linked parts (tps, maf, iac). 0-200 all time I tolerate it do the dealer for diagnostics.. upon going problems are really surcharge up. I m in 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 gruffly after I got it home.Any supplementary urge on you can meet the expense of is appreciated. I don't know what else to pull off but assume it urge on to the dealer. I know I've got the shop foreman effective on it at the dealer, but I yet tone its pushed to the encourage as its old-fashioned and everyone loses in this situation.
This could be a large vacuum leak ,with the MAF similar it is without help measuring the let breathe that is getting in the same way as the MAF, so if the intake manifold is sucking in freshen the let breathe to fuel ratio will be agreed out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. like carb cleaner spray can spray can in the area of the hissing past the engine admin and like you hear the engine stall or rev highly developed there is the leak ,could be a bad vacuum hose bad gasket on the manifold.