Join Date: Dec 2003
Location: Calif central coast
I've got similar problems and am also looking for a place to start. I've got an '03 w' 130k miles. The MDX starts fine but runs rough when cold (not really cold, here in CA only about 40-50 degrees...really just first start of the day). When I put it in gear, it dies. It does this several times, then after a few minutes, seems to be fine for the rest of the day. Occasionally it sets codes: P0175, system too rich, and P0301-6, cyl 1-6 misfire, and P0300, random multiple misfires. But these are transient codes tat clear right away. As soon as it's warmed up the car runs great and is averaging 21 mpg so I know things are generally good. Although I haven't cleaned out the air plenum or adjusted the valves, I find it difficult to believe these could cause the symptoms. I did replace the timing belt and water pump, plugs, wires, etc. at 115k miles but actually was having this problem prior to that maintenance. I was hoping I'd find something during that process that might solve this problem....Nope! Same problem now for about the last 25k miles. I did talk to the local Honda dealer who said unless there is a permanent code set, they won't even look at it. So, like Justin above, I'm looking for someone who might have had a similar problem and found an easy solution. I'd be most grateful for suggestions. Thanks.