Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to drive off a cliff. had a idle surge problem that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After exasperating 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. still 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 suffering with 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 all sorts of diagnostics on every similar parts (tps, maf, iac). $100-200 all epoch I take it reach the dealer for diagnostics.. on going problems are truly totaling up. I m unsure to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I'm 1500 too high.. or more. It's boggling to me how this burden has morphed into various idle problems and has everyone perplexed.. or for that reason it seems. I've been dealing taking into account this before July.. makes me appreciate my 240z 10 period more.My dad owns an sc400 and its been in point of fact good to him.. I'm having a difficult times not instinctive barbed subsequent to this purchase. I get mood considering its a good car though. Motor sounds delectable and is super smooth behind government right.
This could be a large vacuum leak ,with the MAF joined it is unaided measuring the ventilate that is getting in the manner of the MAF, correspondingly if the intake manifold is sucking in freshen the air to fuel ratio will be no question out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. later than carb cleaner spray spray can in the place of the hissing as soon as the engine organization and once you hear the engine stall or rev difficult there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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