O4 Grand Prix Fuse Box Diagram

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 burden that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After grating 2-3 different 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 epoch he says, it needs a ECU. I did a lot of research on them, and found that its a common problem subsequently 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 associated parts (tps, maf, iac). $100-200 every period I tolerate it pull off the dealer for diagnostics.. on going problems are in point of fact adding up up. I m unsure to touch the tps if he had it dialed. Any insight? Thanks in advance. Jason

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Its then worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a under the weather pump will every consequences in insufficient fuel creature delivered to the engine. Might as a consequence be worth cleaning out the idle keenness manage motor / valve as these acquire clogged going on when carbon and some brake cleaner washed through helps clear things off.

as soon as I start the car, the engine surges up between 1200 and 2000 rpm urge on and forth. I tainted the IAC and the TPS subsequently no modify in symptoms. I have noticed that several Lexus SC's have this thesame issue. Prior to this I would have to acclimatize the idle swiftness screw to degrade the rpm and it would keep for a while. Now, the engine is for eternity surging to the reduction where I cannot drive it for distress of broken to the drive train. Any experienced solution?

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