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The Terminator
Engine/Tuning
Can worn out plain copper spark plugs cause a slight rich condition?
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<blockquote data-quote="IUP99snake" data-source="post: 13869241" data-attributes="member: 7060"><p>Here's some additional info about my troubleshooting process so far: </p><p></p><p>I haven't noticed a significant change in my fuel economy despite the slightly richer AFR. I recently made a 250 mile trip to Tallahassee that I've made many times before. I got about the same mileage and had the same amount of gas left over in my tank after the trip. </p><p></p><p>I haven't made any changes or modifications to the engine during that time period. However, to try and remedy the issue, I tried washing out the air filter, cleaning the MAF using the specific cleaning spray, and checking for vacuum leaks. </p><p></p><p>I know that bad 02 sensors can cause a rich condition. While I do have old upstream 02 sensors, I don't think they are bad. The upstream sensors are performing normally according to my OBDII datalogger which shows the voltage data plotted on a graph to show the normal fluctuations in voltage. </p><p></p><p>But I may be wrong about the 02 sensors.. I don't know if they can cause a rich condition even if they display the right data. (If someone thinks it may be the 02 sensors, I'll post a picture of the graph and other data so we can examine it in greater detail). </p><p></p><p>My wideband sensor is mounted in an existing bung after the X in my off-road X pipe where one of the old downstream senors used to be until they were turned off. Since I used an existing bung, the AEM sensor is mounted at the proper angle such as to not allow water to collect in it. I haven't changed the location... But perhaps there might be a slight degradation in the sensor? (it's less than a year old)</p><p></p><p>I'm pretty sure I don't have any vacuum leaks, my analog boost/vac gauge reads 22 in/hg at idle, which is the same as before. </p><p></p><p>But I can use my AEM Wideband failsafe gauge (which also reads boost/vac and RPM) to compare some really detailed datalog files from before and after to see if there are any changes in vacuum which might be causing this. I'll post an update later tonight about this... </p><p></p><p>Hell, copper plugs are so cheap, I might as well just pick up a set on my way home from work and change them...</p></blockquote><p></p>
[QUOTE="IUP99snake, post: 13869241, member: 7060"] Here's some additional info about my troubleshooting process so far: I haven't noticed a significant change in my fuel economy despite the slightly richer AFR. I recently made a 250 mile trip to Tallahassee that I've made many times before. I got about the same mileage and had the same amount of gas left over in my tank after the trip. I haven't made any changes or modifications to the engine during that time period. However, to try and remedy the issue, I tried washing out the air filter, cleaning the MAF using the specific cleaning spray, and checking for vacuum leaks. I know that bad 02 sensors can cause a rich condition. While I do have old upstream 02 sensors, I don't think they are bad. The upstream sensors are performing normally according to my OBDII datalogger which shows the voltage data plotted on a graph to show the normal fluctuations in voltage. But I may be wrong about the 02 sensors.. I don't know if they can cause a rich condition even if they display the right data. (If someone thinks it may be the 02 sensors, I'll post a picture of the graph and other data so we can examine it in greater detail). My wideband sensor is mounted in an existing bung after the X in my off-road X pipe where one of the old downstream senors used to be until they were turned off. Since I used an existing bung, the AEM sensor is mounted at the proper angle such as to not allow water to collect in it. I haven't changed the location... But perhaps there might be a slight degradation in the sensor? (it's less than a year old) I'm pretty sure I don't have any vacuum leaks, my analog boost/vac gauge reads 22 in/hg at idle, which is the same as before. But I can use my AEM Wideband failsafe gauge (which also reads boost/vac and RPM) to compare some really detailed datalog files from before and after to see if there are any changes in vacuum which might be causing this. I'll post an update later tonight about this... Hell, copper plugs are so cheap, I might as well just pick up a set on my way home from work and change them... [/QUOTE]
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Can worn out plain copper spark plugs cause a slight rich condition?
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