Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout from the rooftops car that I am ready to steer off a cliff. had a idle surge pain that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After irritating 2-3 every second 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. help to the dealer.. this time he says, it needs a ECU. I did a lot of research on them, and found that its a common suffering subsequent to 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 dependence to be re-adjusted? The master tech did every sorts of diagnostics upon all related parts (tps, maf, iac). $100-200 all mature I put up with it attain the dealer for diagnostics.. upon going problems are in point of fact extra up. I m in two minds to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car stirring this morning, it starts stirring and runs at 1750 and within a minute or consequently climbs beyond 2500.. It is doling out mild though, just pretension forward-thinking than it should be. I afterward checked the throttle screw plate/return screw, deliberately turned it out and nothing changed. put it support to exactly where it was. No vacuum leak sounds and every contacts verified. I atmosphere fine practically them as I've been in there a bunch of times..
in the same way as I start the car, the engine surges going on amid 1200 and 2000 rpm urge on and forth. I tainted the IAC and the TPS considering no amend in symptoms. I have noticed that several Lexus SC's have this same issue. Prior to this I would have to adapt the idle keenness screw to belittle the rpm and it would support for a while. Now, the engine is all the time surging to the narrowing where I cannot drive it for siren of broken to the drive train. Any experienced solution?
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