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CEL and rough idle when pointed downhill

Ionstorm66
in Old Gen.: 80's GL/DL/XT/Loyales...

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I backed my wagon up my driveway to unload. Next day it was very rough idle and a cel, once it got on flat ground it cleaned up and cel went away.

 

Had about 1/2 a tank so I don't think it was pickup issue, maybe vent?

And vehicle suggestion??

If it has oxy sensor and you lean out going downhill, foot off pedal the CEL light can come on to indicate a lean afr detected about 29:1 , goes away on normal driving.

Not seen rough idle I conjunction though

  • Author
On 6/16/2020 at 4:17 PM, Dee2 said:

check for codes

 

I had a bunch of codes in there from previous. It hasn't done it again so I can't figure which ones are just for this issue. Maybe it was a fluke.

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