Running lean, but no codes????
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New User
Joined: Feb 2004
Posts: 22
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Running lean, but no codes????
I have a 2000 Excursion, with about 80k miles. Last week it started shuddering in 3rd and 4th gear below 2k rpms and the exhaust smells like it is running lean, but it hasn't thrown any codes yet. I've changed the tranny fluid, but it looked just fine, and there wasn't any metal in the pan or on the magnet. So, does anybody have any idea what this might be? I would think that if it was running that lean it would throw a code. Any and all advice will be greatly appreciated.
Post Fiend
Joined: Jan 2002
Posts: 5,859
Likes: 7
From: USA
Have you chk your coolant bottle,make sure your not losing coolant (head gasket)
What color is the tailpipe? Antifreeze burning gives a different smell
Never been able to smell a lean condition in all my yrs.
Have you changed your plugs yet? I'll bet the plug holes are full of moisture.
things to think about
fuel filter
dirty maf sensor
tps sensor
Rich
The tranny I wouldn't even go there yet
What color is the tailpipe? Antifreeze burning gives a different smell
Never been able to smell a lean condition in all my yrs.
Have you changed your plugs yet? I'll bet the plug holes are full of moisture.
things to think about
fuel filter
dirty maf sensor
tps sensor
Rich
The tranny I wouldn't even go there yet
Elder User
Joined: Jun 2005
Posts: 645
Likes: 2
I would take these from Forty's list
and add spark plugs and the PCV assembly. Even the platinum plugs in the SuperDuty start to lose their gap (the gap widens) after about 60k miles. The PCV check is called for every 60k miles/48 months and the typical problem is a rotted rubber hose causing a vacuum leak which leads to a lean condition.
fuel filter
dirty maf sensor
dirty maf sensor
