I have a 2009 Mazda CX7 diesel that "diesels" when I try to star it after a long drive. It will usually start on the second or third try.


Asked by Jan 11, 2014 at 09:46 PM about the 2009 Mazda CX-7 Sport AWD

Question type: Maintenance & Repair

4 Answers

I'd check coolant flow and cleanish green anti-freeze...'cause the engine runs a little hot...because there isn't sufficient coolant flow...change the coolant and equip a brand new thermostat...should fix it~ perhaps seasonal coolant flushes were not performed~

1 out of 1 people think this is helpful.

Dieseling is usually a gasoline engine problem, it is when you shut off the engine and it coughs and spits rattles then it usually shuts down with a whoosh or backfire out the exhaust. You are describing a fuel starvation problem after a hot soak condition, when did you change the filters last and have you maintained the injection system properly. Try running some diesel system cleaner through it then see if that cures your problem.

2 out of 2 people think this is helpful.

hey tennisshoes..the power to the fuel pump would be cut...so really is incapable of dieseling unless something was up with the fuel pressure relay gettin' stuck....whatdya think?~

1 out of 1 people think this is helpful.

Hey all. Thanks for the replies. Another one for you. If your car starts "dieseling" when you're trying to start it especially when it's hot and it might take 3 or 4 starts before it catches I lucked upon the fix. My mechanic thought it was fuel and other folk thought it was the pump or injectors. Turns out the battery died ( after 4 years) and when I put a new battery in ( thank you RACQ ) the problem was fixed. Go figure. Still

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