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Old 09-06-2011, 10:45 PM
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Tomguy Tomguy is offline
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Join Date: Aug 2002
Location: near Scranton, PA
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The 4.5 is quite different - more than just displacement & a cast-iron vs cast-aluminum block. The injection is D-Jet - no fuel distributor, it's an electronic open-loop system (no O2 sensors). When it runs right it's great but when it's off, your fuel economy will be horrible. And cold, the engine eats fuel like a pig. But it's a multi-port EFI system closer to modern cars than that on the 560 really. Pretty easy to troubleshoot as the biggest issues are vacuum leaks, injector issues, vacuum leaks, trigger points, vacuum leaks, wrong timing, vacuum leaks, and vacuum leaks. There are several areas where you can lose a few inches of manifold vac easily, including the central locks (engine manifold fed vs your 560's vacuum pump), the plenum gaskets, the transmission modulator, the line to the MAP, and less likely culprits like the brake booster.

As far as draining the tank, how much gas is in it? It may be in your best interests to pick up a siphon kit and a few gascans to put the old gas in prior to cracking open the plug on the bottom of the tank. 280SE Guy has the best 108 in the world so I will shamelessly use one of his pics to show its location:
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