2001 Durango 4.7l V-8 issue after overheating
#1
2001 Durango 4.7l V-8 issue after overheating
Hey all,
Longish post but trying to get as many details in as possible....
Been fighting with my '01 Durango all week. Last Sunday, everything was good with her...no major issues...Monday wife drove her to work and on the way home, it overheated. She got off the freeway when the "check gauges" popped on. She cranked up the heat to attempt to cool the engine off, strangely enough, no heat coming out of the vents. She parked and called me and AAA to get towed home. I got there about 25 minutes later and saw the check engine light was on. Pulled the codes and got P208 (cylinder 8 injector malfunction) and P308 (cylinder 8 misfire detected). I found a water leak at the auxiliary pump (was cracked and leaking after getting hot) so I figured that #8 got drenched,. Got her home (that's when I found the leak at the aux pump) and of course it was running rough as h*ll. Started looking closer at the engine (no apparent coolant in the oil) and that is when I found the snapped off crankcase breather element (passenger side, rear engine block) right near cylinder 8. Went to pick n pull to get replacement and ended up getting the wrong one and finally found one at O'Riley's. Replaced both drivers and passenger side breather elements, replaced the faulty aux pump (when I pulled the line off the outlet side it was trashed - corroded and cracked/broken fished all the pieces out of the line, I hope) and fired her back up. Still P208 and P308 and running really rough (duh Steve, your missing cylinder #8), Still not sure about the overheating issue the aux pump did not fix it...think it might be a t-stat or main water pump issue (both replaced about 2 years ago). At this point I am waiting for my mechanic to get back for further diagnosis,,,am hoping that I don't have a cracked head/blown head gasket...any suggestions on the misfire issue ??? Am I on the right track with the t-stat/water pump??? Any suggestions would be greatly appreciated.
Thanks
Steve
Longish post but trying to get as many details in as possible....
Been fighting with my '01 Durango all week. Last Sunday, everything was good with her...no major issues...Monday wife drove her to work and on the way home, it overheated. She got off the freeway when the "check gauges" popped on. She cranked up the heat to attempt to cool the engine off, strangely enough, no heat coming out of the vents. She parked and called me and AAA to get towed home. I got there about 25 minutes later and saw the check engine light was on. Pulled the codes and got P208 (cylinder 8 injector malfunction) and P308 (cylinder 8 misfire detected). I found a water leak at the auxiliary pump (was cracked and leaking after getting hot) so I figured that #8 got drenched,. Got her home (that's when I found the leak at the aux pump) and of course it was running rough as h*ll. Started looking closer at the engine (no apparent coolant in the oil) and that is when I found the snapped off crankcase breather element (passenger side, rear engine block) right near cylinder 8. Went to pick n pull to get replacement and ended up getting the wrong one and finally found one at O'Riley's. Replaced both drivers and passenger side breather elements, replaced the faulty aux pump (when I pulled the line off the outlet side it was trashed - corroded and cracked/broken fished all the pieces out of the line, I hope) and fired her back up. Still P208 and P308 and running really rough (duh Steve, your missing cylinder #8), Still not sure about the overheating issue the aux pump did not fix it...think it might be a t-stat or main water pump issue (both replaced about 2 years ago). At this point I am waiting for my mechanic to get back for further diagnosis,,,am hoping that I don't have a cracked head/blown head gasket...any suggestions on the misfire issue ??? Am I on the right track with the t-stat/water pump??? Any suggestions would be greatly appreciated.
Thanks
Steve
#2
Likely dropped a valve seat in cyl #8, very common problem for these engines when overheated. Your wife sounds like she did everything right to try and protect it, but the 4.7 heads are the weakpoint and they drop valve seats far too easily.
Compression test cyl #8, it will likely verify my guess.
Compression test cyl #8, it will likely verify my guess.
#3
Likely dropped a valve seat in cyl #8, very common problem for these engines when overheated. Your wife sounds like she did everything right to try and protect it, but the 4.7 heads are the weakpoint and they drop valve seats far too easily.
Compression test cyl #8, it will likely verify my guess.
Compression test cyl #8, it will likely verify my guess.
Thanks,
Steve
#4
If the coolant leaked out, there'd be nothing to carry heat to the heater core. So no heat. If you really want to know if your head gasket is shot, rent a block tester. Also, if you start the engine cold with the cap off, the coolant should not be turbulent in any kind of way. If it shoots out, you know the deal. The 4.7L hates overheating more than any other.
#5
If the coolant leaked out, there'd be nothing to carry heat to the heater core. So no heat. If you really want to know if your head gasket is shot, rent a block tester. Also, if you start the engine cold with the cap off, the coolant should not be turbulent in any kind of way. If it shoots out, you know the deal. The 4.7L hates overheating more than any other.
Thanks again,
Steve