Hello there, new to this forum.
I have a 2001 D2 with about 170k on it. I very recently completed a HG and front cover job. Since getting it back together I've been fighting a P0308 misfire. After replacing most of the common components, I'm still stuck with the lone P0308 and a rough idle. I've replaced the front O2 sensors, coils, wires, plugs, and injectors. I still cant shake the P0308, but I'm getting quicker at removing that upper intake.
Some other steps, I've put an inspection camera into #8 and it looked fine. There were no coolant puddles and it appeared the same as other cylinders. If I move a dirty plug into #8, it does not get cleaned. The engine starts right up without hesitation. I've also done my best to spray around with carb cleaner to look for vacuum leaks and I haven't been able to find anything conclusive there.
I was talking with a fellow local Disco owner and I'm starting to think it may be valve train related or if nothing else just redo the whole HG job. I recall some difficulties with that passenger side rocker assembly when I was putting everything back together. My rocker assemblies were quite grimy so I cleaned them in gasoline before reinstalling. Other than that I did not do anything special with their re-assembly except poor some oil over them once the oil pan was installed. The heads were surfaced and had a valve job completed by a local shop. I remember there was junk from the hot dip in the rocker tower bolts and I had issues getting one of the bolts in (almost cross threaded it). I was able to get everything torqued down, but its just that nagging dread. I have some pics I took during the job on Flickr.
So I'm thinking about tearing it down to the valve covers and taking a look inside. I'm just not 100% sure what I can look for or test with the valve covers off to verify that the problem is not with the rocker assembly. Any input or ideas would be appreciated.
I have a 2001 D2 with about 170k on it. I very recently completed a HG and front cover job. Since getting it back together I've been fighting a P0308 misfire. After replacing most of the common components, I'm still stuck with the lone P0308 and a rough idle. I've replaced the front O2 sensors, coils, wires, plugs, and injectors. I still cant shake the P0308, but I'm getting quicker at removing that upper intake.
Some other steps, I've put an inspection camera into #8 and it looked fine. There were no coolant puddles and it appeared the same as other cylinders. If I move a dirty plug into #8, it does not get cleaned. The engine starts right up without hesitation. I've also done my best to spray around with carb cleaner to look for vacuum leaks and I haven't been able to find anything conclusive there.
I was talking with a fellow local Disco owner and I'm starting to think it may be valve train related or if nothing else just redo the whole HG job. I recall some difficulties with that passenger side rocker assembly when I was putting everything back together. My rocker assemblies were quite grimy so I cleaned them in gasoline before reinstalling. Other than that I did not do anything special with their re-assembly except poor some oil over them once the oil pan was installed. The heads were surfaced and had a valve job completed by a local shop. I remember there was junk from the hot dip in the rocker tower bolts and I had issues getting one of the bolts in (almost cross threaded it). I was able to get everything torqued down, but its just that nagging dread. I have some pics I took during the job on Flickr.
So I'm thinking about tearing it down to the valve covers and taking a look inside. I'm just not 100% sure what I can look for or test with the valve covers off to verify that the problem is not with the rocker assembly. Any input or ideas would be appreciated.
