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Diagnose Ford 3.0L V6 Engine
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The Ford 3.0L Duratec V6 engine, which has was introduced back in 1996, has Sequential Multiport Fuel Injection (SFI), a single coil distributorless ignition system, and an upper and lower intake manifold with electronically controlled Intake Manifold Runner Control (IMRC). Recent versions of this engine also have variable valve timing. The dual overhead cams on the Duratec engine are chain driven, so there is no timing belt to replace.
The intake manifold runner control system (IMRC) can be troublesome, and may set a code P1518 if the runner control valve is stuck in the open position. Sludge can build up in the IMRC causing it to stick. Ford has a reprogramming fix in TSB 02-15-3 that causes the IMRC to cycle at speeds over 40 mph to reduce sludge buildup on the runner plates.
Fuel delivery problems on 1996-’98 Taurus or Sable 3.0L V6 can prevent the engine from starting. The engine will crank normally and will have spark, but it won't start because the engine is not getting any fuel. The problem is not a bad fuel pump, but a dead fuel pump because the wires to the pump on top of the fuel tank have shorted out. Ford TSB 98-25-1 covers the installation of protective plastic tubing on the fuel pump wires to prevent chaffing on these vehicles.
Hard starting on 1996-’98 Taurus and Sable can also occur if the idle air control (IAC) valve on the throttle is sticking or gummed up. Ford TSB 97-9-5 covers the details of how to replace the IAC valve.......
Click Here to read the full article on the Underhood Service magazine website.
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