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Code 31 again

Old May 25, 2008 | 07:54 PM
  #1  
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Code 31 again

I cannot seem to get rid of my code 31 I replaced the evp. I broke down and bought one of those code reader deals and after clearing the codes the way the book says to Im still getting a 31 a 10 and an 11 in the continuous what is going on with this truck.? it idles good it seems a little high to me but good. it runs good until it shifts into high gear at low speeds and it shutters and sounds like it has a miss...any ideas? by the way were talking about an 87 F250 efi 302 and yup I checked the fireing order.
 
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Old May 25, 2008 | 10:12 PM
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A potential vacuum leak? Do you have the juice can on the pass fender? If so this is a vacuum resovoir and are known to rust out.
 
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Old May 26, 2008 | 07:20 AM
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no rust on the juice can in fact it has good vacuum at the can and everywhere else as best as I can tell...
 
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Old May 26, 2008 | 08:17 AM
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Does it hold this vacuum after the motor is shut off?
 
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Old May 26, 2008 | 04:42 PM
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yes after i turn the motor off and pull the vacuum line connector off of it I can hear the suction being released
 
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