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Lexia 3 PP2000 works with most Citroen and Peugeot cars from 1995 include Peugeot 307 Support read identification read fault codes clear fault codes auto scan etc Comes with...
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I would check the operation of the idle speed control valve, it is what changes the idle speed when a load like the transmission is put on the engine, without it the engine will idle slow and stall out, this is even more apparent when reverse gear is selected or drive or the AC is tuned on. The ISC valve is located on the side of the throttle body top of upper intake manifold. Below is a picture of the ISC (idle speed control valve)
The drag from the transmission and the power assist for the power brakes andthe extra load of the brake lights on the electrical sytem, may accially slow down the altentor lowering the total system voltage, in the long run changing the voltage at the engine sensers, throwing the computers tune of the motor off some.. cars built since 1980 that have fuel injection shouldn't do this very little or none at all. The reason is that the fuel system has an automatic idel speed motor that catches the idel and holds it at the right level no matter what the load. This system has limits and problems that limit it's ability to keep the idel right. Then theres the other way around. There's a vacume leak or other problem making the engine idel too fast and when the loads are added ( power steering , in gear automatic trans, airconditioner, raditor fan ) bring the engine to the correct level and the system will keep it from going any lower.
Take/Tow your vehicle to an authorized Hyundai dealership and pay the diagnostic fee... they will tell you exactly what the problem is and the cost of parts/labor to fix it... at least this way you'll know what the problem is and what's required to fix it.Go to www.hmaservice.com and register( Vehicle by VIN). Afterward, you have access to shop manuals, service bulletins, wiring diagrams, etc. about your vehicle.
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