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  1. V

    Poor Accelleration when warm OK COLD ?

    Just replaced head gaskets on 91 Explorer. Runs fine for the first few minutes when cold, but as soon as it warms up it has VERY poor accelleration. CEL is not lit. I ran codes & get RPM Idle out of range (code 12 & code 13) ON KOER. all other codes normal & Base timing correct At idle...
  2. V

    Poor Accelleration when warm 9/29

    Just replaced head gaskets on 91 Explorer. Runs fine for the first few minutes when cold, but as soon as it warms up it has VERY poor accelleration. CEL is not lit. I ran codes & get RPM Idle out of range (code 13 & code 14) ON KOER. At idle, the engine sounds fine, but the exhaust out...
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