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99 envoy..ride sucked cause the shocks were out of air,,,everything seems to be good checked the pump all the plugs.pump relay.replaced the timer relay..i can manually activate the pump by closing the contacts on the pump relay,,rides better with air..in the shocks,,common failures of components with this system? need some input..this is driving me crazy..onlything left is the leveler control on the axle..the maual pump for the scrader valve for filling tires wont even activate when the on button is pushed the relay switches the seliniod for this but the pump wont run..help tnx gregg in ohio
 
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