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Mazda5 Engine Issues

21 messages,  Last post on Mar 03, 2009 at 3:37 PM

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#20 of 21 Re: Cold Engine Acceleration Issues [dr_who] by techtyler Dec 22, 2008 (6:21 pm)
Replying to: dr_who (May 22, 2008 4:39 pm) Can you describe the symptoms that you experienced with the engine stumble. I have been dealing with the same issues and I have been trying to get the local Mazda dealer to fix it for the same symptom but they refuse to believe me, or find a solution to the problem. I'm so ticked!
#21 of 21 Black Box by vicenac Mar 03, 2009 (3:37 pm)
All newer cars have it, but it's much simpler then thought to be. It does record in a loop of... about 6 minutes. It keeps the highest RPM, fastest speed, average fuel consumption etc. It basically provides a statistical history of the car, not a play by play life. The break-in goal is to allow the formation of oil film on all the parts rubbing together. Since on new engines, the oil film is not permanent on all parts (and their entire surfaces) it is recommended that strain would not be put on - so the parts lacking an oil film would not rub very hard and exhibit premature wear. BUT... at different RPM, some parts come in contact with other at different points of their surfaces. Ex: valve ends will put pressure on a different part of a cam at different speeds; pistons will travel a few microns more at higher RPM. That is why running the engine through all its regimes is very important. Don't be afraid to spin your engine up to the red line (it's designed to go there), just do not put load on it. There are cases when damage has been observed on the top ring on the piston, because during the break-in period the engine was not rev’d up and used in the same manner as it was after that. I.E. if will rev the engine to 5k only after the break in, your top ring will suddenly encounter a part of the cylinder that does not have the "mirror" formed (more or less like running on sand paper). "If gonna race it, race it now, just not too hard" an old mechanic said once.

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