1994 Ford Explorer Code 341 While Towing

1934 FORD EXPLORER
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DUREE
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  • 1 POST
94 Ford Explorer - 120,000 miles
Car runs fine except when towing 1800 lb pop-up camper. After an hour, the check engine light comes on and the car starts "jumping". Gas mileage decreases. Carbon monoxide detector in camper starts beeping. Disconnect the camper and let the car cool down and it runs fine again. Code is 341 - Octane incorrect or octane adjust service pin open or octane adjuster circuit open - no one can figure out why.Any ideas? Thanks!
Jun 29, 2006 at 1:34 AM
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TAURUSWHEEL
  • ✓Experienced Mechanic
  • 718 POSTS
Is your octane shorting bar still inline??? If yes, check the resistance of the circuit, if good, then either the circuit is open. the shorting bar itself is bad, or the signal return is bad if the resistance is alright,, the pcm may also be at fault, however Ford units are pretty reliable.. If the shorting bar is not there, supposedly there must be a decal noting modification to the sytem
Jul 2, 2006 at 11:01 AM
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Suggested Repair

Confirm the octane shorting bar is still installed. If it is, check circuit resistance; an open circuit, a bad shorting bar, or a bad signal return can set code 341. If resistance is good, the PCM may be at fault, though Ford units are generally reliable. If the bar is missing, look for a decal noting a system modification.

Conversation Summary

A 1994 Ford Explorer runs normally until towing a camper for about an hour, then the check engine light comes on, the engine jumps, mileage drops, and a camper carbon monoxide detector alarms. After the camper is disconnected and the vehicle cools, it runs fine. Code 341 points to an octane adjust pin or circuit problem. The expert advises checking that the octane shorting bar is present and testing circuit resistance, then considering an open circuit, bad shorting bar, bad signal return, or possibly the PCM.

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