Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to steer off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After frustrating 2-3 alternating 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 period he says, it needs a ECU. I did a lot of research on them, and found that its a common hardship in the manner of 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 need to be re-adjusted? The master tech did every sorts of diagnostics upon all combined parts (tps, maf, iac). $100-200 every time I acknowledge it attain the dealer for diagnostics.. upon going problems are in fact adding up. I m unsure to be adjacent 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 suffering has morphed into various idle problems and has everyone perplexed.. or thus it seems. I’ve been dealing subsequent to this back July.. makes me appreciate my 240z 10 times more.My father owns an sc400 and its been in point of fact good to him.. I’m having a hard get older not being sour behind this purchase. I pull off quality gone its a good car though. Motor sounds gorgeous and is super smooth behind presidency right.
This could be a large vacuum leak ,with the MAF linked it is abandoned measuring the air that is getting behind the MAF, correspondingly if the intake manifold is sucking in air the freshen to fuel ratio will be completely 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 in the place of the hissing later than the engine management and afterward you listen the engine stall or rev vanguard there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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