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· Registered
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Discussion Starter · #1 ·
2007 Mazda 3 2.0L Automatic. Car idles and drives rough under load. No CEL codes. Feels like a vacuum leak, but no loose or broken vacuum lines.

Parts replaced or cleaned within past 6 months:
OEM Iridium spark plugs
Purge Solenoid Valve
Passenger side and rear mounts
Throttle Body removed and cleaned
MAF sensor cleaned
Air filter and Oil + filter change
Serpentine belt
Transmission flush and fill: First time and it was at 80,000 miles. The mechanic used Wolf's Head Universal ATF. I was worried about it being machine flushed as opposed to drain and fill, but it's been 3 months and no issues. Made a noticeable difference in smoother shifting.

The purge solenoid fixed the starting issue after re-fueling, but didn't seem to effect roughness. My suspicion is either:
Drivers side mount
o2 Sensor
Intake gasket leak

Comments and suggestions please

· Registered
8,662 Posts
Look under the upper engine mount. If you see oil or discoloration on the frame rail under the mount, or see disbonding or visible wear of the rubber portion of the mount, replace it.

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