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Too lean bank 1 +2 03 Windstar

gkaiser124gkaiser124 Posts: 1
I've got an 03 Windstar I recently bought, has 140,000 miles on it. Every few weeks, it'll throw out the error code for too lean bank 1 + 2. I'll clear it, then a few weeks later it'll pop up again. When it the check engine light does come on, it usually occurs while idling at a light and it'll run rough for maybe 30 seconds then run fine.
I've replaced the MAF + Fuel Filter + Air Filter. (Fuel filter was still the original and very clogged). I've run fuel injector cleaner twice now through it. Had the dealership check for vacuum leaks (none found). I have noticed in the past few weeks my MPG go down drastically in the city. Before I was averaging 17-19 and now I'm getting 13-19 in the city. So, I'm thinking maybe its a fuel delivery problem? Maybe something it just starting to go but it hasnt yet? I've ordered a new fuel pressure regulator which I'm going to put in this week...

I'm just confused because its driving fine, and this only happens once every few weeks. Any ideas?

Comments

  • Try replacing the pcv valve. About 20 bucks at Ford and its super easy. If all else fails, might be the O2 sensors.
  • By now i hope you have this fixed. I found this trying to get this worked out on my 03 i did fuel and air filter. The problem turned out to be spark.
  • fystywindstarfystywindstar Surrey, B.C., CanadaPosts: 23

    I've got an 03 Windstar I recently bought, has 140,000 miles on it. Every few weeks, it'll throw out the error code for too lean bank 1 + 2. I'll clear it, then a few weeks later it'll pop up again. When it the check engine light does come on, it usually occurs while idling at a light and it'll run rough for maybe 30 seconds then run fine.
    I've replaced the MAF + Fuel Filter + Air Filter. (Fuel filter was still the original and very clogged). I've run fuel injector cleaner twice now through it. Had the dealership check for vacuum leaks (none found). I have noticed in the past few weeks my MPG go down drastically in the city. Before I was averaging 17-19 and now I'm getting 13-19 in the city. So, I'm thinking maybe its a fuel delivery problem? Maybe something it just starting to go but it hasnt yet? I've ordered a new fuel pressure regulator which I'm going to put in this week...

    I'm just confused because its driving fine, and this only happens once every few weeks. Any ideas?

    This is a intake manifold gasket leak. I have the same thing on my 02 but only on the right bank & Ford told me this is a common problem & I am still getting decent fuel economy so for now I don't care. I have learn long ago how to "listen" to my engine.
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