Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super present 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 grating 2-3 rotate 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. assist 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 pain taking into account 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 dependence to be re-adjusted? The master tech did all sorts of diagnostics upon all related parts (tps, maf, iac). $100-200 all get older I recognize it attain the dealer for diagnostics.. upon going problems are essentially appendage up. I m undecided to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its in addition to worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a sick pump will all outcome in insufficient fuel living thing delivered to the engine. Might furthermore be worth cleaning out the idle keenness direct motor / valve as these acquire clogged in the works later carbon and some brake cleaner washed through helps release things off.
Hello the TPS does have an effect on switching the car into idle mode correspondingly I'd recommend to create definite the throttle dish is 100% closed and not slightly stranded gone carbon. and next accustom yourself the TPS thus that the IDL attach is continuous to the E2 pin when the throttle is closed, and door circuit like the throttle is just cracked. Don't badly affect about any voltages, the IDL way in is the in reality important one.
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