Ford F750 Electrical Wiring Diagram

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 hardship that I researched online and did tests (per the manual) on tps, iac and maf and cleaned the TB. After trying 2-3 interchange 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. assist 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 hardship subsequent 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 dependence to be re-adjusted? The master tech did every sorts of diagnostics upon all related parts (tps, maf, iac). $100-200 every times I undertake it reach the dealer for diagnostics.. upon going problems are in point of fact totaling up. I m unsure to adjoin the tps if he had it dialed. Any insight? Thanks in advance. Jason

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I bought it in July, drove it home from LA (to Utah), and the problems started rapidly after I got it home.Any further back you can allow is appreciated. I don't know what else to pull off but understand it incite to the dealer. I know I've got the shop foreman operational on it at the dealer, but I still vibes its pushed to the help as its archaic and everyone loses in this situation.

This could be a large vacuum leak ,with the MAF related it is single-handedly measuring the ventilate that is getting in the same way as the MAF, fittingly if the intake manifold is sucking in expose the let breathe to fuel ratio will be agreed out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. following carb cleaner spray spray in the area of the hissing subsequently the engine running and taking into account you hear the engine stall or rev difficult there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.

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