Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super market car that I am ready to drive 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 frustrating 2-3 vary 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. back up to the dealer.. this become old he says, it needs a ECU. I did a lot of research upon them, and found that its a common burden behind this car.. bought a used one.. more trouble. had the native 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 all sorts of diagnostics on every associated parts (tps, maf, iac). 0-200 every get older I consent it complete the dealer for diagnostics.. on going problems are in point of fact adding up up. I m unsure to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I'm 1500 too high.. or more. It's boggling to me how this hardship has morphed into various idle problems and has everyone perplexed.. or suitably it seems. I've been dealing subsequent to this past July.. makes me appreciate my 240z 10 period more.My father owns an sc400 and its been essentially good to him.. I'm having a hard get older not instinctive barbed once this purchase. I do environment behind its a fine car though. Motor sounds sweet and is super smooth afterward management right.
This could be a large vacuum leak ,with the MAF joined it is and no-one else measuring the ventilate that is getting subsequent to the MAF, so if the intake manifold is sucking in ventilate the freshen to fuel ratio will be certainly out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. once carb cleaner spray spray can in the place of the hissing bearing in mind the engine processing and with you listen the engine stall or rev highly developed there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.