I got these codes on my 2000 Disco 2, wondering if its the coil packs. Any suggestion would be much appreciated. I know the P1590 is related to the abs, 3 amigos which I'll be tackling tomorrow.

 

Coil packs are less likely the culprit than the spark plug or the plug wire.

 

while unlikely, but #1 & #7 are on the same coil

 

true, but P0300 is a general misfire, not Cylinder #1

 

tis true, wire or plug as suggested above

 

I had the same codes recently and it usually is wires... I have a bad O2 sensor that was throwing a code, so I grabbed an old one off the garage floor while waiting for new ones to arrive and swapped it in just to see what would happen. Shockingly, I got misfire codes... The precise ones you mentioned. Knowing nothing else had changed I swapped the old sensor back in and they went away. For what it is worth... Again, probably wires but put a scanner on it and see if you 1/1 O2 sensor is messed up.

 

I replaced all my plugs today and same result. My wires are less than 10,000 miles old. STI 8mm blue. I'll try o2 sensors next. My truck was giving off that egg/sulfur smell. If that doesn't work should I replace wires or coils, or both?

 

How do I check if I have a bad coil? Would I just take cylinder number seven spark plug wire (Misfire is in cylinder 7) and attach it to another spark plug/cylinder? Like cylinder 5, and if I get a p03005 than the fault moved to another cylinder and its my coil? Can someone clarify this for me. Thanks. Or is it my wire?

 

If you swap the wire to another cylinder, remember you have to swap it at the coil end as well. Otherwise you will have monkeyed with the firing order and will get more misfires.

It's a pain but the way to test one suspect coil is to swap the coils round.

I would swap wires first. Which is obviously just testing the wire. If the symptom persists in the same cylinder after swapping the wire, the coil is next in line to check.

 

What about the p0300 code I pulled. What's that in reference to? Does that just show up because cylinder 7 is creating a muck of things?