I have a '99 Durango 4x4 w/ a 5.2 and it runs like crap.
I had a mechanic scan it and it came up P0305 & P0306 (#5 & #6 cylinders misfiring). It was recommended that I replace the plugs, wires, cap and rotor. I did.
NOTHING!
I've also replaced the coil.
NOTHING!
It really spits and chugs between 1000 and 2500 RPM with a popping sound from the exhaust. I also detect a strong gasoline odor from the tailpipe when this happens. If I mash it to the floor or run above 2500 RPM, it runs fine.
When I drive in town it will stall sometimes when I let off the gas.
Questions....
1. Could I possibly have 2 bad injectors? I don't believe it's the fuel rail because these are opposing cylinders (3rd from front on each side).
2. Could it be a valve or cylinder problem?
3. Rings???
OR
4. Will a bottle of SeaFoam Motor Treatment really work?

Thank you to anyone that can help me!

Rob

I have a '99 Durango 4x4 w/ a 5.2 and it runs like crap.
I had a mechanic scan it and it came up P0305 & P0306 (#5 & #6 cylinders misfiring). It was recommended that I replace the plugs, wires, cap and rotor. I did.
NOTHING!
I've also replaced the coil.
NOTHING!
It really spits and chugs between 1000 and 2500 RPM with a popping sound from the exhaust. I also detect a strong gasoline odor from the tailpipe when this happens. If I mash it to the floor or run above 2500 RPM, it runs fine.
When I drive in town it will stall sometimes when I let off the gas.
Questions....
1. Could I possibly have 2 bad injectors? I don't believe it's the fuel rail because these are opposing cylinders (3rd from front on each side).
2. Could it be a valve or cylinder problem?
3. Rings???
OR
4. Will a bottle of SeaFoam Motor Treatment really work?

Thank you to anyone that can help me!

Robfuel pumps are bad in alot of those

Replace the TPS sensor. It's $30 at autozone. The TPS tells the computer where the throttle cable is & computes the fuel load. If it malfunctions at all you will have a misfire. It will backfire as well. The injectors get their pulse width (how much fuel, how long it sprays,etc..)from the main computer which gets it's info from the TPS, The map sensor, the transmission speed sensor and the temp sensor in that order. Just replaced the TPS in one that would not idle. Last week I replaced one that caused 3 injectors to quit and the poor thing had no power on the freeway. This durango only had 50,000 miles on it too. After you replace the TPS, unhook your positive battery cable for 10 mins. It resets everything in the computer related to the TPS. Start it up and go. You can find the TPS on the throttle body up high near the airbox top. It's gray & held on by 2 screws. Easy to change. Don't be surprised it didn't give a code (usually PO121). It has to go berserk before it will code. But believe me, the TPS is going bad. Good luck, Patarusky

What a typical Dodge solution! Re-routing the plug wires to fix a miss in one or more injectors. You can call any Dodge dealer and they will tell you they sell tons of TPS units (if they're honest) because they go bad. Any other fix is temporary. Let's see how long his Durango runs before it acts up again.

And remember-He already changed all the wires, plugs, etc... and nothing happened! I love my Durango but I know the common problems and He has one.

And remember-He already changed all the wires, plugs, etc... and nothing happened! I love my Durango but I know the common problems and He has one.


He may have changed all the wires but were they routed correctly? Gotta read into the fixes. You can also change all the wires and hook them up to the wrong plugs, that also means that "you just changed the wires". No? The wires may be Autozone specials, the plugs may be super nuclear grade platnium high compression projected tungston tips and wouldn't work on a lawnmower. So you cannot take anything for granted! Gotta start at point A and work to point Z! Durangos do run correctly, you just have to fix them in a logical and professional manner. :thumbsup:

What a typical Dodge solution! Re-routing the plug wires to fix a miss in one or more injectors. You can call any Dodge dealer and they will tell you they sell tons of TPS units (if they're honest) because they go bad. Any other fix is temporary. Let's see how long his Durango runs before it acts up again.

Why do you say to re-route the spark plug wires to fix an injector problem? This Service Bulletin does work for the problem it describes, it won't fix a bad muffler or a bad injector! We know about the bad TPS's. That was not the reason I posted the Service Bulletin.

Oh yeah, have a little respect for other people's posts-Thank you!:wink:

It is very possible that you have two bad injectors ,try switching them with two other clylinders and see if the misfire moves with them. Is the fuel pressure within specs ? Is the fuel quality good ?

Bad TPS - brother in law HAD a 5.2 with the exact same symptoms. It didn't clear up until the TPS was replaced.

on the magnum engines the pan on the bottom of the intake leaks causing a misfire and sometimes high oil consumption. there was a tsb on it but i cant find it at the moment.

does anyone know how to correctly install this switch? is it spring loaded?? i had the same problem and installed new switch and now it is even worse!!!!
bob