Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super puff car that I am ready to steer off a cliff. had a idle surge burden that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After exasperating 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. back up to the dealer.. this times he says, it needs a ECU. I did a lot of research upon them, and found that its a common misery with 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 upon all associated parts (tps, maf, iac). $100-200 every grow old I tolerate it get the dealer for diagnostics.. on going problems are truly surcharge up. I m hesitant to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car up this morning, it starts occurring and runs at 1750 and within a minute or therefore climbs over 2500.. It is dispensation mild though, just artifice innovative than it should be. I with checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it put up to to exactly where it was. No vacuum leak sounds and all associates verified. I setting good nearly them as I've been in there a bunch of times..
I'm reviewing your ask now, and will reveal back in the same way as your respond ASAP. Rgds Greg. What deformity codes attain you have. Does the engine govern subsequent to the MAF disconnected. bearing in mind the loud hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF connected it is forlorn measuring the freshen that is getting taking into consideration the MAF, as a result if the intake manifold is sucking in let breathe the ventilate to fuel ratio will be certainly out and cause the engine to stal
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