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Mazda5 Engine Issues

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

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What is this discussion about? Mazda MAZDA5, Engine, Wagon

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#14 of 21 Re: Mazda5 Break-in question [partsguy1] by kw_da Oct 17, 2006 (10:23 am)
Replying to: partsguy1 (Sep 05, 2006 8:26 am) Hi,   Google is your friend - see black box. The article says "but due to a digital setup that is more like a tape loop that constantly runs, it is able to record the last few seconds before a crash, capturing information regarding vehicle speed, braking severity, the direction of skid, etc, helping analysts reconstruct the crash."   So it can tell why you died, but not how badly you mistreated the engine. Also your manual should have some information according to the article, but I haven't checked ours yet.   David
#15 of 21 Cold Engine Acceleration Issues by dr_who May 22, 2008 (4:39 pm)
I have a 2007 Mazda 5 Sport 5 speed manual (that, in general, I am very happy with) and have experienced the engine stumble mentioned elsewhere in this forum. It is on my to-do list to go get the issue addressed.    I have also experienced cold acceleration issues that may be unrelated to the engine stumble TSB. It feels to me like I am driving a carbureted car instead of a fuel-injected car for about the first five minutes after starting the car when the engine is not hot. Acceleration is rough and slow at low RPMs and then abruptly kicks in smoother and more powerful (feels like a turbo kicking in after winding up) at around ~3000 RPM. This is a problem in both winter and summer driving. Once the engine is warmed up, the acceleration problem goes away.    Has anyone else experienced these cold acceleration issues? Is there a known fix? Does having the engine stumble TSB fix (reprogramming the PCM) done on the car also fix this issue? Replies to this message: techtyler (Dec 22, 2008 6:21 pm)
#16 of 21 engine oil by gschulz May 22, 2008 (6:46 pm)
Might the lighter weight 5W/20 also be for better fuel economy, with the tight tolerances in the todays engine could it also be that is why they recommend lighter weight oil and still have proper lubrication? Anybody know?
#17 of 21 engine oil by gschulz May 22, 2008 (6:46 pm)
Might the lighter weight 5W/20 also be for better fuel economy, with the tight tolerances in the todays engine could it also be that is why they recommend lighter weight oil and still have proper lubrication? Anybody know for sure?
#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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