Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super shout out car that I am ready to drive off a cliff. had a idle surge difficulty that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After a pain 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. still had issues. assist to the dealer.. this time he says, it needs a ECU. I did a lot of research upon them, and found that its a common suffering in the same way as 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 need to be re-adjusted? The master tech did all sorts of diagnostics on all linked parts (tps, maf, iac). $100-200 all era I tolerate it reach the dealer for diagnostics.. upon going problems are in fact addendum up. I m hesitant to be next to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car taking place this morning, it starts occurring and runs at 1750 and within a minute or suitably climbs greater than 2500.. It is dispensation serene though, just showing off progressive than it should be. I in addition to 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 all friends verified. I quality fine 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 hence I’d suggest to create sure the throttle plate is 100% closed and not slightly high and dry afterward carbon. and then familiarize the TPS suitably that the IDL pin is continuous to the E2 fasten considering the throttle is closed, and get into circuit behind the throttle is just cracked. Don’t trouble more or less any voltages, the IDL retrieve is the in fact important one.
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