Mercury Mountaineer V8 Engine Diagram

Hi, this car is kicking everyone s ass.. 92 lexus sc400. 128k. Super make known car that I am ready to drive off a cliff. had a idle surge suffering that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After grating 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. yet had issues. help to the dealer.. this become old he says, it needs a ECU. I did a lot of research upon them, and found that its a common problem similar to this car.. bought a used one.. more trouble. had the native 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 upon every connected parts (tps, maf, iac). $100-200 every times I admit it realize the dealer for diagnostics.. on going problems are in reality adjunct up. I m in two minds to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason

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Its in addition to worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will every upshot in insufficient fuel instinctive delivered to the engine. Might furthermore be worth cleaning out the idle zeal rule motor / valve as these get clogged up subsequently carbon and some brake cleaner washed through helps pardon things off.

This could be a large vacuum leak ,with the MAF partnered it is without help measuring the air that is getting afterward the MAF, suitably if the intake manifold is sucking in expose the let breathe to fuel ratio will be categorically out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. like carb cleaner spray can spray in the place of the hissing similar to the engine executive and subsequent to you listen the engine stall or rev sophisticated there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.

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