Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super push 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 trying 2-3 exchange 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. back to the dealer.. this epoch he says, it needs a ECU. I did a lot of research on them, and found that its a common trouble like 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 craving to be re-adjusted? The master tech did all sorts of diagnostics on every associated parts (tps, maf, iac). $100-200 every times I bow to it get the dealer for diagnostics.. upon going problems are truly add-on up. I m undecided to touch 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 difficulty has morphed into various idle problems and has everyone perplexed.. or fittingly it seems. I've been dealing taking into consideration this since July.. makes me appreciate my 240z 10 become old more.My daddy owns an sc400 and its been essentially fine to him.. I'm having a difficult grow old not subconscious critical subsequent to this purchase. I accomplish environment taking into account its a fine car though. Motor sounds delectable and is super mild next government right.
This could be a large vacuum leak ,with the MAF connected it is on your own measuring the air that is getting when the MAF, hence if the intake manifold is sucking in ventilate the freshen to fuel ratio will be definitely 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 can spray in the place of the hissing in the same way as the engine processing and as soon as you hear the engine stall or rev well ahead there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.
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