Could 110 Leaded Fuel Cause Part Throttle Stutter?
03-10-2005, 12:06 PM
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Could 110 Leaded Fuel Cause Part Throttle Stutter? I went out to Irwindale Speedway a few weeks ago and added about 4 gallons of 110 Leaded race fuel to the last couple gallons of 100 Unleaded fuel that was in the tank.
On the way back from the track I noticed that the car wanted to buck and stutter at part throttle (about 5%). I noticed especially down a long grade at part thottle. The same thing happens when cruising around town. It will make a slight popping noise (like a tiny backfire) as if it was way too rich. As soon as I give it just a tiny bit more gas the stutter dissapears and it drives just like normal.
The car is tuned for nitrous (I don't know specifics but it is deffinately on the rich side). I am using Autolite AR103 plugs gapped at .032. When I got home I pulled all of the plugs suspecting I could have burnt a plug or two, but they came out just as good as they went in. I changed the plugs out for a brand new set and I still have the same stutter problem. The car does not feel like it is down on power at all.
Could the leaded fuel have fouled the O2 sensors that quickly? Could 110 octane be too high for my application, especially N/A with the plugs gapped at .032? If anyone has run leaded race fuel in their car please chime in, or anyone has any ideas your feedback is much appreciated.
Ross
On the way back from the track I noticed that the car wanted to buck and stutter at part throttle (about 5%). I noticed especially down a long grade at part thottle. The same thing happens when cruising around town. It will make a slight popping noise (like a tiny backfire) as if it was way too rich. As soon as I give it just a tiny bit more gas the stutter dissapears and it drives just like normal.
The car is tuned for nitrous (I don't know specifics but it is deffinately on the rich side). I am using Autolite AR103 plugs gapped at .032. When I got home I pulled all of the plugs suspecting I could have burnt a plug or two, but they came out just as good as they went in. I changed the plugs out for a brand new set and I still have the same stutter problem. The car does not feel like it is down on power at all.
Could the leaded fuel have fouled the O2 sensors that quickly? Could 110 octane be too high for my application, especially N/A with the plugs gapped at .032? If anyone has run leaded race fuel in their car please chime in, or anyone has any ideas your feedback is much appreciated.
Ross
Last edited by bad2000ss; 03-10-2005 at 01:21 PM.
03-10-2005, 02:23 PM
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Thanks for the input guys.
Would the car throw an SES code if the sensors are starting to go bad or would it only throw a code due to a complete failure?
I am supposed to be racing the car tonight, but I don't want to risk anything if the O2's are truely screwed up.
What do replacement O2 sensors cost and can the rear O2 sensors be used in the front?
Thanks
Would the car throw an SES code if the sensors are starting to go bad or would it only throw a code due to a complete failure?
I am supposed to be racing the car tonight, but I don't want to risk anything if the O2's are truely screwed up.
What do replacement O2 sensors cost and can the rear O2 sensors be used in the front?
Thanks
03-17-2005, 11:00 AM
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Just a quick follow up.
I threw in a new set of front O2 sensors and it fixed the problem. The left side O2 sensor looked normal but the right side was white in color. The whole time the car did not throw any SES codes.
I threw in a new set of front O2 sensors and it fixed the problem. The left side O2 sensor looked normal but the right side was white in color. The whole time the car did not throw any SES codes.
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03-17-2005, 03:03 PM
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Originally Posted by bad2000ss
Just a quick follow up.
I threw in a new set of front O2 sensors and it fixed the problem. The left side O2 sensor looked normal but the right side was white in color. The whole time the car did not throw any SES codes.
I threw in a new set of front O2 sensors and it fixed the problem. The left side O2 sensor looked normal but the right side was white in color. The whole time the car did not throw any SES codes.
