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 trouble that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After grating 2-3 stand-in 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. encourage to the dealer.. this mature he says, it needs a ECU. I did a lot of research on them, and found that its a common burden in imitation of 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 all sorts of diagnostics upon every linked parts (tps, maf, iac). $100-200 every epoch I tolerate it get the dealer for diagnostics.. on going problems are really calculation up. I m undecided to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car happening this morning, it starts up and runs at 1750 and within a minute or consequently climbs beyond 2500.. It is handing out serene though, just quirk sophisticated than it should be. I plus checked the throttle screw plate/return screw, intentionally turned it out and nothing changed. put it support to exactly where it was. No vacuum leak sounds and every friends verified. I environment good just about them as I’ve been in there a bunch of times..
have you looked into throttle body coking and/or combustion chamber/valve carbon buildup? are you going on to date upon all maintenance; spark plugs fuel filter pcv vlave etc? have you performed a visual inspection and listened to engine as it warms occurring and is warmed up? oftentimes in engine perform many factors may cause the thesame symptom(s)
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