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What about the TPS? When the problem is acting up, if you punch the pedal to the floor it jumps and accelerates just fine, but as soon as you let the pedal slightly off the floor it starts stumbling and bogging.


Test it: http://www.4crawler.com/4x4/CheapTricks/TPS/index.shtml

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Does the ECU go into a closed loop( no readings from 02 sensors) when you go full throttle? My cobra does, just didnt know if my truck functions the same way.


Yep, read the autoshop101.com technical articles on the EFI system. Or throw an Air/Fuel meter on and you can see when the system is in open or closed loop by watching the O2 sensor output.

r.c.brown@ieee.org
TruckEditor@tlca.org
Project: 4Crawler
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