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I know what you mean about not having room to work around the engine. FWIW, the AstroVan is RWD and the motor is not transverse mounted, but that doesn't make it any easier to work on. I end up pulling the passenger seat and the engine cover from inside the van to get at most of the engine as the AC and air intake box take up most of the room that is under the hood. The dash still presents a major obstacle to getting access to the engine in some cases.
Odd that there are no OBD codes. Definitely leads me to think that the problem is mechanical and not computer/sensor related. Not sure that it would be lifters or rocker arms causing it, as they are roller lifters in the 4.3L Vortec engine, and the cam runs at half the speed of the crankshaft. I would look for something external to the engine first, perhaps harmonic balancer or flexplate/flywheel related? Torque converter bolts loose? Perhaps broken motor mount? Timing chain slapping inside the timing cover?
Do you have a mechanic's stethoscope? Might help in pinpointing the source of the noise. Harbor Freight sells them for @ $5, not great quality but good enough to get the job done.
Feel free to contact me off-list if you wish to save bandwidth for Volvo stuff. billmz at cox.net
billy242
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