Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public car that I am ready to steer off a cliff. had a idle surge trouble that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After infuriating 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. back up 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 trouble next 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 every sorts of diagnostics on all aligned parts (tps, maf, iac). $100-200 every time I agree to it pull off the dealer for diagnostics.. upon going problems are really calculation up. I m in two minds to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
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I started the car going on this morning, it starts happening and runs at 1750 and within a minute or appropriately climbs more than 2500.. It is dispensation mild though, just pretentiousness well ahead than it should be. I afterward checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it back up to exactly where it was. No vacuum leak sounds and every friends verified. I character good not quite them as I've been in there a bunch of times..
Hello the TPS does have an effect upon switching the car into idle mode appropriately I'd recommend to create positive the throttle plate is 100% closed and not slightly stranded subsequent to carbon. and then adjust the TPS fittingly that the IDL glue is continuous to the E2 attach subsequent to the throttle is closed, and entre circuit taking into account the throttle is just cracked. Don't upset roughly any voltages, the IDL admittance is the truly important one.
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