Misfiring
- Thread starter shoftw
- Start date
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Both lean codes come up
Bryan
What do you get when a deer & SHO cross at 45mph?
Misfiring tends to be fouled plugs. Wires possibly not clean or corroded. Faulty DIS. Check these first as they are the easiest things to get to.
ok, the reason we look at the codes is so we don't have to guess. Lean codes will not occur from fouled plugs or bad wires or bad dis; in those cases you might have rich codes or no codes related to a/f ratio.
Lean codes may result from bad oxy sensors, or from vacuum leaks somewhere in the intake system. Since these cars are now 20+ years old, many of the underhood hoses are cracked, brittle, etc. and can easily leak. So, the most likely candidate for your issues is vacuum leaks. If the oxy sensors are relatively older, then I would suggest changing them as they get slow over time. Oxy sensors can fail by either reading too rich or too lean, so its possible that your oxy sensors are no longer functioning correctly, resulting in the lean code.
It is also possible that you have lean codes due to a fuel pump or fuel filter or fuel pressure regulator issue. Old pumps get weak, such that the car works fine at idle and low power needs, but is wimpy when you rev it higher or mash on the gas. Again, if your pump is older, replacing it is a good idea anyway, since they don't last forever. The filter could be plugged or the regulator could be not providing enough fuel pressure.
Those are the places I would look first.
Lean codes may result from bad oxy sensors, or from vacuum leaks somewhere in the intake system. Since these cars are now 20+ years old, many of the underhood hoses are cracked, brittle, etc. and can easily leak. So, the most likely candidate for your issues is vacuum leaks. If the oxy sensors are relatively older, then I would suggest changing them as they get slow over time. Oxy sensors can fail by either reading too rich or too lean, so its possible that your oxy sensors are no longer functioning correctly, resulting in the lean code.
It is also possible that you have lean codes due to a fuel pump or fuel filter or fuel pressure regulator issue. Old pumps get weak, such that the car works fine at idle and low power needs, but is wimpy when you rev it higher or mash on the gas. Again, if your pump is older, replacing it is a good idea anyway, since they don't last forever. The filter could be plugged or the regulator could be not providing enough fuel pressure.
Those are the places I would look first.
luigisho
SHO Member
Post the number that appears when you pull codes. there are different protocols for different codes.
How old are your ignition components? Have you replaced plugs and wires recently? Have you removed plug wires to see if there is oil at the bottom of the spark plug tubes. Each one has an oil seal that can leak and foul out spark
Already replaced everything but injectors the codes are 172 and 136
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luigisho
SHO Member
what is everything? Again, being specific is key to eliminating possibilities especially over the interwebs. I don't know what you're trying to say only what you specifically post. We don't know you personally and can't possibly presume to know what your talking about in short hand familiar language
and you had an older thread that you should have continued so we could reference previous posts
https://shoforum.com/index.php?threads/misfiring-idling-weird.135868/#post-1476126
and you had an older thread that you should have continued so we could reference previous posts
https://shoforum.com/index.php?threads/misfiring-idling-weird.135868/#post-1476126
172 and136
Fuel pump,fuel rail with regulator,fuel filter
