Random Misfire I just purchased a 2002 Durango with a 4.7L 140,000 miles. Here is the Problem I'm getting a flashing check engine light, when I pull the codes I get p0300 (random misfire) p0302 (Cylinder 2 Misfire), p0303 (Cylinder 3 Misfire), p0304 (Cylinder 4 Misfire), p0307 (Cylinder 7 Misfire). It had auto lite spark plugs installed that looked good, I installed champion oem plugs all gaped to .040. I moved coil packs around. cleared the codes, drove it around a little it came back with the same codes. the check engine light goes out when I restart, and usually only comes on when I do a High acceleration take off. Also I do not feel the misfire, it seems to run great with no hesitation. Any Ideas? has anyone heard of electrically charged coolant? I have never heard of this but seen it on another site, they said it could cause the multiple cylinder misfire like I have, but they didn't get into any detail. any Ideas would be greatly appreciated.

No, the fuel leaks into the intake manifold and is then suckedinto the cylinders. This causes multi cylinder misfire due to the extra gas that is leaking in. No, the fuel leaks into the intake manifold and is then suckedinto the cylinders. This causes multi cylinder misfire due to the extra gas that is leaking in.

is there anyway to check this? is there anyway to check this?

A fuel pressure gauge amy show a drop in fuel line pressure if it is a significant leak.. Do you see black smoke coming from exhaust when starting unit? If the regulator or lines are leaking the check engine light should be on, is it on?? A fuel pressure gauge amy show a drop in fuel line pressure if it is a significant leak.. Do you see black smoke coming from exhaust when starting unit? If the regulator or lines are leaking the check engine light should be on, is it on??

no black smoke, an as stated in the original post yes the check engine light comes on flashing the codes are all related to misfire ref original post. also it runs an drives fine. the only way u can tell there is a problem is by the check engine light, otherwise you would never know no black smoke, an as stated in the original post yes the check engine light comes on flashing the codes are all related to misfire ref original post. also it runs an drives fine. the only way u can tell there is a problem is by the check engine light, otherwise you would never know

Sorry about the check engine light, I got two different Durangos confused. The wires can cause the misfires in different cylinders. Try wetting wires by spraying water on the wires with a spray bottle, then look at the wires for signs of cross sparking. This is easier to do when it is dark, as the spark jumping between the wires will be easier to see. If they are bad you will see the spark jumping between wires. Other than this there is only the pressure regulator and injectors and or lines leaking that would throw a random cylinder misfire, or multiple cylinder misfire. When leaking bad it will throw out black smoke on startup, but a small leak may not. Here is a link for extremely low cost fuel injector assemblies. email: [email protected] or call 877-525-5233 to order. They have these parts for less than half of what you would pay at an autoparts store. I can walk you through the repair process if need be. Sorry about the check engine light, I got two different Durangos confused. The wires can cause the misfires in different cylinders. Try wetting wires by spraying water on the wires with a spray bottle, then look at the wires for signs of cross sparking. This is easier to do when it is dark, as the spark jumping between the wires will be easier to see. If they are bad you will see the spark jumping between wires. Other than this there is only the pressure regulator and injectors and or lines leaking that would throw a random cylinder misfire, or multiple cylinder misfire. When leaking bad it will throw out black smoke on startup, but a small leak may not. Here is a link for extremely low cost fuel injector assemblies. email: [email protected] or call 877-525-5233 to order. They have these parts for less than half of what you would pay at an autoparts store. I can walk you through the repair process if need be.