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Old Feb 25, 2019 | 08:51 AM
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JT1991
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Weird Jolting

A buddy and I had just finished putting a set of headers on my '91 F-150 and it sounds good as all hell, it was fine all yesterday. Although when I drove to school the next morning (about 25 miles) it was a lot slower than usual on the interstate but i believe that is from the O2 sensor being taken out, we are going to drill a bung into the new headers to put the sensor back but we weren't able to when we were putting the headers on. all was fine and expected but when i got off the interstate for the last 5 miles or so, every time i was accelerating from low end of second gear it was jolting hard, just like a new driver in a manual, my buddy thought it was a miss fire but it was only happening during the bottom end in second gear, I'm not sure if the O2 Sensor would fix that or i just unleashed a whole new problem.
If anyone would know what it is or could help out it would be greatly appreciated,

Thank You,
Jack
 
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Old Feb 25, 2019 | 09:42 AM
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The O2 sensor isn't installed into the exhaust flow and you're wondering why the engine isn't running correctly? I think you've answered your own question.
 
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Old Feb 25, 2019 | 09:10 PM
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But would thatexplain the bucking?
 
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Old Feb 26, 2019 | 09:26 AM
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Originally Posted by JT1991
But would that explain the bucking?
Certainly, because without the O2 sensor exhaust reading the computer isn't able to control the air/fuel mixture properly for the current driving condition.
 
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