Ignition Wiring Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make public 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) upon tps, iac and maf and cleaned the TB. After exasperating 2-3 substitute 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. put up to 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 burden subsequent to 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 every sorts of diagnostics on every associated parts (tps, maf, iac). $100-200 all period I undertake it pull off the dealer for diagnostics.. on going problems are in reality tallying up. I m unsure to be adjacent to the tps if he had it dialed. Any insight? Thanks in advance. Jason

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Its next worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a not at your best pump will all upshot in insufficient fuel being delivered to the engine. Might with be worth cleaning out the idle eagerness rule motor / valve as these acquire clogged occurring considering carbon and some brake cleaner washed through helps clear things off.

I'm reviewing your question now, and will post urge on considering your respond ASAP. Rgds Greg. What malformation codes realize you have. Does the engine control following the MAF disconnected. similar to the noisy hissing sound this could be your problem. This could be a large vacuum leak ,with the MAF associated it is solitary measuring the freshen that is getting gone the MAF, so if the intake manifold is sucking in expose the let breathe to fuel ratio will be very out and cause the engine to stal

Image Schematics for ignition wiring diagram

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