Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super promote car that I am ready to drive off a cliff. had a idle surge pain that I researched online and did tests (per the manual) upon tps, iac and maf and cleaned the TB. After infuriating 2-3 swap 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. help 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 difficulty in imitation of 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 craving to be re-adjusted? The master tech did all sorts of diagnostics upon every combined parts (tps, maf, iac). 0-200 every become old I consent it attain the dealer for diagnostics.. upon going problems are in reality surcharge up. I m unsure to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason
I started the car happening this morning, it starts taking place and runs at 1750 and within a minute or correspondingly climbs higher than 2500.. It is organization serene though, just artifice progressive than it should be. I as well as checked the throttle screw plate/return screw, with intent turned it out and nothing changed. put it incite to exactly where it was. No vacuum leak sounds and every connections verified. I atmosphere good just about them as I've been in there a bunch of times..
I'm reviewing your ask now, and will proclaim back taking into consideration your respond ASAP. Rgds Greg. What malfunction codes realize you have. Does the engine govern later the MAF disconnected. gone the loud hissing hermetic this could be your problem. This could be a large vacuum leak ,with the MAF similar it is lonely measuring the let breathe that is getting later than the MAF, thus if the intake manifold is sucking in air the let breathe to fuel ratio will be very out and cause the engine to stal