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Originally Posted by jodiz
I sure appreciate all your responses. I don't know much about mechanics and I am impressed with all of your advice. It seems I have plenty to work on so I'll start doing my part and I'll let you all know what the findings are.
I forgot also to mention that the problem gets worse as I drive for a while and the engine warms up. When I first start there is no problem it is only after a few minutes that I accelerate and the van doesn't seem to respond...and the explosions...and the rest...well you know already.
Thanks again!
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You have two basic areas of concern with a problem like this; ignition and fuel delivery. A simple thing to check is the ignition coil. A defective coil can cause these problems, as it warms up and it starts breaking down. Change te coil to eliminate the issue.
These symtoms can also be caused by a lean fuel mixture. A clogged fuel filter, specially the inlet strainer on the in-tank fuel pump can do this. As you drive the car, the inlet filter collapses and fuel pressure drops below the required minimun. The injectors can't deliver enough fuel and the lean mixture causes backfiring and loss of power. See if you can get a fuel pressure gauge attached to the fuel release port (I rigged a gauge from an old R12 AC charging manifold to it) and drive around with the gauge attached to see what happens to the pressure when the problem occurs. The gauge looked weird taped up on the outside of the winshield but it diagnosed the problem right away!
Hopefully this will help. Happy New Year!
RM-TECH