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Old 04-19-2008, 11:32 AM   #6
pk2
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Join Date: Aug 2007
Location: Tustin Ca.
Posts: 449
Sounds kinda like fuel starvation. In that it craps after 15 minuets (about warmed up) it's no longer running rich and maybe regular lean mode is just to lean. I had this problem exactly in a BMW. Mine was always the fuel filter .

Given you've covered that base, you might take look at the fuel pump. Tests usually involve flow and pressure (2 tests).

Good luck, PK
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