Detail: My 2004 ford ranger v6 3.0L suddenly started ideling hard and poor acceleration(loss of power) we have discovered that a couple of the pistons aren't firing properly but don't know how to fix it! we changed the coil pack, plugs, and wires... no fix and actually seems worse! Please help!
Solution: Did you visually check for spark at the spark plugs? You can use a digital multimeter on low voltage, engine idling, touch the spark plug wires, one at a time, note the reading. You don't take the plug wire loose or penetrate the insulation, it's an inductive reading, bleed through voltage or whatever you want to call it. On different vehicles, I've seen readings like .6 or.7 volt, not a full vote. If you find a reading that is bouncing off zero, then there is no spark on that wire, for some reason. I saw what you replaced, but, you may have to check wiring circuits for coil pack. Any applicable trouble codes? If a misfire on a couple of cylinders, the idle will be terrible. Fuel--spark--compression. , Try getting a manual from www.reliable-store.comit's very helpful in repairing info or try manualslife.com very good online places, makes repair much easier , Hi, a 6ya Mechanic can help you resolve that issue over the phone in a minute or two. Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US. click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need. Goodluck! , your timing belt/ chain could be out of time, could have a clogged cat/ could be bad o2 sensor throwing off the air/ fuel mixture. any combo of those also. have you done a cylinder pressure test?, that will determine if you have a blown head gasket or not. cuz if its a gasket, the pressure would just go to another cylinder and no pressure = no power.