2001 B3000 Mazda truck vibrating when idling and accelerating but not when accelerator is released. Rotten egg smell when problem began, but seemed to fade when heater turned off. No smoke or odor under the hood. Firing order checked and #6 wire was misfiring, but was replaced. Coil pack replaced with no positive results.

all right guys and/or gals. the vibrating is actually not going away when you let off the accelerator it is not going to be present when the vehicle is not under a load, as when you let off it is then coasting. have you checked the hydro carbons in the engine at all that will show a blown head gasket, hence the smell out the tailpipe and the low compression reading. you can usually pick up a block tester at the local parts storefairly easy to use. i would possibly start there. you can check to see if coolant is low or milky a little but sometimes that wont tell you, check oil level and see if it is high on the dipstick sometimes you get lucky there too. do either one of the vehicles back fire when they run rough? usually that is a tell tale sign of fuel/air issues. does either one of the trucks have any check engine lights on? if so what code if any has been pulled? let me know and ill start searching deeper and will get you the answer. all right guys and/or gals. the vibrating is actually not going away when you let off the accelerator it is not going to be present when the vehicle is not under a load, as when you let off it is then coasting. have you checked the hydro carbons in the engine at all that will show a blown head gasket, hence the smell out the tailpipe and the low compression reading. you can usually pick up a block tester at the local parts storefairly easy to use. i would possibly start there. you can check to see if coolant is low or milky a little but sometimes that wont tell you, check oil level and see if it is high on the dipstick sometimes you get lucky there too. do either one of the vehicles back fire when they run rough? usually that is a tell tale sign of fuel/air issues. does either one of the trucks have any check engine lights on? if so what code if any has been pulled? let me know and ill start searching deeper and will get you the answer.