Trucky
New Member
- Jun 26, 2011
- 380
- Boat Info
- 1999 210SD SunDeck / 2002 Ford F250 CC Lariat 4X4, slightly tweaked 7.3L
- Engines
- 5.0 Mercruiser220hp/Alpha I
99 210SD 5.0 MCM 2 barrel with 350 hours. Only after it warms up does it begin to backfire through the intake under load. It only seems to happen between 2600-3600 RPM. Above 3600 on up to WOT at 4800 seems to run fine, as well as lower RPMs and idle speed. It has a fresh tank of non-ethanol regular, properly laced with Startron. New plugs last summer. I'm not sure on the age or condition of the rest of the ignition system or the timing. Any thoughts on where to look?