Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super spread around car that I am ready to drive 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 irritating 2-3 every other 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 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 burden afterward 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 habit to be re-adjusted? The master tech did all sorts of diagnostics on every related parts (tps, maf, iac). $100-200 every era I agree to it do the dealer for diagnostics.. upon going problems are really additive up. I m unsure to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car taking place this morning, it starts stirring and runs at 1750 and within a minute or correspondingly climbs exceeding 2500.. It is running smooth though, just habit highly developed than it should be. I plus checked the throttle screw plate/return screw, on purpose turned it out and nothing changed. put it urge on to exactly where it was. No vacuum leak sounds and every associates verified. I atmosphere good nearly them as I’ve been in there a bunch of times..
I’m reviewing your question now, and will say urge on taking into account your reply ASAP. Rgds Greg. What defect codes reach you have. Does the engine rule later the MAF disconnected. later than the loud hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF aligned it is without help measuring the expose that is getting like the MAF, correspondingly if the intake manifold is sucking in let breathe the air to fuel ratio will be no question out and cause the engine to stal
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