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- 2008 Mazda5 GT
Been having idle (vibration) issues for a while now. Only occurs when the car in Drive/Reverse (drivetrain engaged). RPM is not erratic and the car otherwise idles fine in Park/Neutral and drives/accelerates fine. I suspect either air or fuel issues but there’s no check engine light. Vibrations can sometimes be very violent and at times do not occur!?! This is starting to annoy me… Anyone else experience this? Something else to check?
Took out EGR, cleaned/scrubbed
Took out throttle body, clean both sides
Took out and test purge valve solenoid
Took out and cleaned both EVAP solenoid
Took out and cleaned MAF
Open bottle of propane to check for vacuum leak
3 OEM mounts (granted not standard fit, per say) < 10K miles
New spark plugs < 500 miles
Engine air filter is not clogged
Some other things that come to mind is PCV but that’s a b*tch to get to. Fuel injector blockage but full injector clearing service can get expensive and requires down time (send out injectors, no local place). I do feel my avg. MPG has dropped. I also think perhaps it is motor mount but that does not explain why it happens sometimes but not others. Also, it is b/c of vibrations that lead me to replace all motor mounts ~10K ago. Is there something else that could be a cause? Aside from PCV, have I exhausted all "air" side of the problem? I think the next to check would be "fuel". May try to use some fuel additive/injector cleaner to see if that helps. IF this improves the situation, may point me towards fuel side and the lead culprit may very well be dirty injectors...
Took out EGR, cleaned/scrubbed
Took out throttle body, clean both sides
Took out and test purge valve solenoid
Took out and cleaned both EVAP solenoid
Took out and cleaned MAF
Open bottle of propane to check for vacuum leak
3 OEM mounts (granted not standard fit, per say) < 10K miles
New spark plugs < 500 miles
Engine air filter is not clogged
Some other things that come to mind is PCV but that’s a b*tch to get to. Fuel injector blockage but full injector clearing service can get expensive and requires down time (send out injectors, no local place). I do feel my avg. MPG has dropped. I also think perhaps it is motor mount but that does not explain why it happens sometimes but not others. Also, it is b/c of vibrations that lead me to replace all motor mounts ~10K ago. Is there something else that could be a cause? Aside from PCV, have I exhausted all "air" side of the problem? I think the next to check would be "fuel". May try to use some fuel additive/injector cleaner to see if that helps. IF this improves the situation, may point me towards fuel side and the lead culprit may very well be dirty injectors...
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