Lean code
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Lean code
I recently replaced the spark plugs in my 5.4 2001 expedition. I used Bosch plugs. It now shows a lean condition on both banks. I clear the codes but they come back. I find no air leaks. Could it be the plugs causing this?
Hotshot
Joined: Jan 2004
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From: St Louis
Originally Posted by Don4.6
Plugs could be a problem I replaced mine on my 4.6(1979 F150) with bosch and it ran very lean with a small miss. So I went back and replaced them with autolight plugs ran perfect after that. good luck.
Stick with the suggestion re: vacuum leak. You probably knocked something loose or missed a hose connection while doing the plug swap.
Steve
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Originally Posted by projectSHO89
Spark plugs won't cause lean codes. Misfires and crappy running from the Bosches, yeah, but not lean codes.
Stick with the suggestion re: vacuum leak. You probably knocked something loose or missed a hose connection while doing the plug swap.
Steve
Stick with the suggestion re: vacuum leak. You probably knocked something loose or missed a hose connection while doing the plug swap.
Steve
Sorry for the mix up on Lean codes.Because when I swaped my 302 over to the new 4.6(281) AODE I had a problem with the Engine Running crappy so then I removed the bosch platinum plugs and installed autolights problem solved.
so stick to thesuggestion re: vacuum leak. You probably knocked something loose or missed a hose connection while doing the plug swap.
1979 F150 4.6
1977 F150 5.8 EXPLORE PKG
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Lean code
I re-checked for loose hoses and leaks. Found none. When I changed the plugs I cleaned the throttle body with B-12. Could that have messed up the O2 sensors?
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Joe Kucinski
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From: Nottingham, MD
What is the code exactly? If both banks are leak, I would look for a vac leak. Especially the elbow fitting at the back of the of the air intake. The pipe runs from the rear of the intake to the pcv valve. And a word of advice, I would change your plugs to autolite or motorcraft brand. Don't take a chance with the boush plugs, I lost an engine because of them. Chris
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