Can anyone help please. My 04 Disco II is displaying P0300 and P0307 codes.
Background...
Initial codes:
P1884
P0154
P0174
P0130
P0171
Diagnosed this and it was a bad O2 sensor and replaced. New spark plugs in and added 44K. I also checked and verified Mass air sensor was working by swapping out one that works.

Now I am getting P0300 and P0307. Idle is not smooth (subtle miss) all the time in park and when driving about 30mph and lightly pushing on the pedal I get a miss feeling. Any ideas?

P.S. Currently in PA but live close no Nashville.

 

I had exact same codes and needed new coil pack. But there was a few things to check first. I recall searching here and finding many threads on this. Good luck!

 

Thanks! Yeah many threads and I probably have read them all but never was a member or asked a question and just used it to find out answers. I am not interested in doing that myself...hands and arms too big.

 

Hook up a scanner that will inform you of which cylinder is misfiring then try a different spark plug, then wire, then cool pack until the misfire is resolved. If none of those fix it, check or replace the fuel injector.

 

Reader says cylinder 7. Just replaced all spark plugs. The initial symptoms I posted are still the same but after the new spark plugs and O2 sensor now I get the misfire code for cylinder 7.

 

Swap the coil packs and see if the misfire follows it then you have your fault

 

X2 on that. If it swaps to another cylinder you'll know it is the coils.

What a PITA to swap coils, though. I'd rather eat dirt.

I would have thought MAF but you have that covered...

 

I should just put new ones in and wires. Hopefully get it done this week. At least I will have confidence that it is done. I have another add to the to do list...So I drove from PA back to Clarksville, TN and my temp gauge was doing the exersist... It would spike all the way hot then back all the way cold. Didn't start until the end of the trip. I am lucky I have an OBD2 or I would have kept pulling over.

 

The temp gauge in a Discovery should just have two points... "You're probably okay" and "you're screwed; drive to a car lot or mechanic, if you can".

Yours has a third global setting: "I have no idea". Hahah. That's funny. Glad you had some electronic backup.

 

I am glad too...that ride would have been very long! I think it has to do with water... I say this because every issue I have had has happened because water. Cleaned all the mud and grime off engine and underneath...nothing wants to run right anymore. Yesterday, half my trip was in some good quality down pours and temp gauge wants to do its own thing.