So my wife's 2004 E popped a CEL last night. I went and had the codes read at Autozone today and got the P-0300, P-0301, P-0302, P-0304 code.
My first thought was electrical stemming from the coils. But then it occured to me that the likelihood of 3 coild going bad at the same time was very low. Looking around on the forums here I read a few posts from people that had similar codes and the problem stemmed from the valves.
So I removed the spark plugs and checked the compression on the cyliders.
The results were as follows:
Cylinder 1: 175
Cylinder 2: 190
Cylinder 3: 190
Cylinder 4: 190
So obviously #1 is a little low, but still within 10%. What was much more concerning however was the condition of the spark plug from #1
If you look at the attachment, the plugs are in order from left to right, 1-4.
The electrode has ash all over it and there is oil residue on the threads.
I am adjusting the valves tomorrow hoping that will correct the difference in the compression. But the question is will it correct what is fouling the plug?
Hopefully the valves in cylinder 1 is so far off that it isn't seating properly.
If not, anyone want to wager a guess of whether it is a burned valve seat or blown rings?
My first thought was electrical stemming from the coils. But then it occured to me that the likelihood of 3 coild going bad at the same time was very low. Looking around on the forums here I read a few posts from people that had similar codes and the problem stemmed from the valves.
So I removed the spark plugs and checked the compression on the cyliders.
The results were as follows:
Cylinder 1: 175
Cylinder 2: 190
Cylinder 3: 190
Cylinder 4: 190
So obviously #1 is a little low, but still within 10%. What was much more concerning however was the condition of the spark plug from #1
If you look at the attachment, the plugs are in order from left to right, 1-4.
The electrode has ash all over it and there is oil residue on the threads.
I am adjusting the valves tomorrow hoping that will correct the difference in the compression. But the question is will it correct what is fouling the plug?
Hopefully the valves in cylinder 1 is so far off that it isn't seating properly.
If not, anyone want to wager a guess of whether it is a burned valve seat or blown rings?
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