How am I running lean?
#1
How am I running lean?
2006 Dakota 4.7L HO
35000 miles
300 miles ago, I changed my plugs with the factory recommended plug. Champion RC7PYCB4. Gapped to 0.040
Took them out tonight to see how they were coloring. The ground electrode has this weird white powder on it, and the insulator is bright white. ALL 8 plugs are this way (rules out coolant leak)
Doesn't the computer control the mixture, how could it be running lean. Is the computer not controlling the timing properly?
PIC:
35000 miles
300 miles ago, I changed my plugs with the factory recommended plug. Champion RC7PYCB4. Gapped to 0.040
Took them out tonight to see how they were coloring. The ground electrode has this weird white powder on it, and the insulator is bright white. ALL 8 plugs are this way (rules out coolant leak)
Doesn't the computer control the mixture, how could it be running lean. Is the computer not controlling the timing properly?
PIC:
Last edited by mezerr; 06-22-2011 at 07:58 AM.
#2
#3
#5
And I'm running an HO, which requires (according to manual) the plug I stated. It's the same plug that was pulled out. Same heat range.
#7
"CAUTION: Never substitute the original platinum tipped HO spark plug with a different part number. Serious engine damage may result."
The plugs I've used are factory heat range, and factory gapped and factory plugs..
I can't see a vacuum leak visibly anywhere, and this only started happening with new plugs, the old ones were nice and tan
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#9
Are you saying that above plug have the same heat range index as the stock plug?
#10
Those plugs are too hot for the ho motor. The 5&6 heat range are autolite 3923 and 3924. The 3922 are a 7 heat range bkr7= 4644.