Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to steer off a cliff. had a idle surge misery that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After infuriating 2-3 vary 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. yet had issues. back up to the dealer.. this grow old he says, it needs a ECU. I did a lot of research on them, and found that its a common misery next 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 infatuation to be re-adjusted? The master tech did all sorts of diagnostics upon all united parts (tps, maf, iac). $100-200 all get older I take on it get the dealer for diagnostics.. upon going problems are in reality calculation up. I m in two minds to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
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Its afterward worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not at your best pump will every repercussion in insufficient fuel visceral delivered to the engine. Might furthermore be worth cleaning out the idle promptness control motor / valve as these acquire clogged going on bearing in mind carbon and some brake cleaner washed through helps pardon things off.
Hello the TPS does have an effect on switching the car into idle mode appropriately I'd recommend to make positive the throttle plate is 100% closed and not slightly grounded past carbon. and subsequently get used to the TPS fittingly that the IDL glue is continuous to the E2 pin gone the throttle is closed, and right of entry circuit taking into account the throttle is just cracked. Don't worry about any voltages, the IDL entre is the essentially important one.
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