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Mazda 5 .. engine shuts on and off


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lee24
Novice

Aug 13, 2020, 5:51 AM

Post #1 of 12 (259 views)
Mazda 5 .. engine shuts on and off Sign In

Hiya
I have (my gfs car tbf)a 2006 Mazda 5. Diesel. Approx 130k miles. Pretty sure its a 2L.
Anyhow this is the problem..

When driving or sat still revving the engine, it just cuts out, like someone shut off the fuel. So if i sit in the car and slowely let the revs build up to approx 3.5k the engine runs fine up to that point then dies, ignition is still on, keep my foot on the accelerator without moving my foot .. the revs drop down as the engine has died and as soon as it gets down to 1k it kicks back into life, builds back up to 3k then dies again until it drops to 1k.. and keeps doing this cycle. If im driving it and it dies, if i change gear, up or down, it springs back into life. WTF.
Brief history... ran fine until a few weeks ago when it broke down on the mrs, basically the alternator pulley came off. Towed it back home. Fitted a new alternator and belt. Fired up sweet. When revving it, thats when i noticed this issue. Cannot be 100% sure it didnt do it before the alternator issue as i dont drive it, but im 99% sure she would have noticed if it did. Double checked all connections to alternator. Now it went to a garage, they said its not showing any codes. Fitted a new fuel filter but didnt cure the issue. I checked the valve timing and found the cam was 1 tooth out. So i sorted the cam timing and corrected it. Set the crank, cam and fuel pump which is driven by the cam belt but it still does this dying business. Im at a loose end as to what to do now.
Any help would be vastly appreciated.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Aug 13, 2020, 6:24 AM

Post #2 of 12 (249 views)
Re: Mazda 5 .. engine shuts on and off Sign In

First off "Diesel" isn't a specialty for me just basics: Quoting you ">I checked the valve timing and found the cam was 1 tooth out.<" ??
Just how can that happen I'm not familiar with this at all just that it can't be allowed to.
That could do that once may have been worse we may never know.
Whole game with the concept is to always have very high compression vs gasoline/petrol engines or just a no go. Anything that lowers that I don't think it will fire.
The issue now is finding it off a tooth did it damage anything valving must be super tight for high compression if any hit you'll need to know. Not my game bet valving collided and will have to tend to that perhaps not feasible to repair can't be known till a serious inspection,


T



lee24
Novice

Aug 13, 2020, 6:31 AM

Post #3 of 12 (241 views)
Re: Mazda 5 .. engine shuts on and off Sign In

its possible when the alternator dies and pulley jammed against the chassis .. the belt could have cause an issue with the cam belt.. no idea to be honest. But it was a tooth out. Ran fine before the incident and fires up fine now. Just has this issue thats driving me nuts.

https://youtu.be.com/Vr9yBR5eKQQ

If you can see that video, thats not revving it it, its letting revs build up, keeping accelerator in one position and engines dies then comes back to life when revs have dropped. Accelerator in the same postion throughout.


(This post was edited by lee24 on Aug 13, 2020, 6:37 AM)


Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 13, 2020, 6:47 AM

Post #4 of 12 (229 views)
Re: Mazda 5 .. engine shuts on and off Sign In

I'm stuck with primal basics here. Please tell me how an accessory like an alternator has anything to do with cam timing? If so I'm really lost how this is set up.
You said it failed such that it hit the chassis of this car! Yikes, sounds more like some disaster happened where one failure causes another if an alternator could move there must have been a wild warning of something wrong?


What happened? Video just wouldn't show sorry, some just wont IDK why on that alone doubt it would help,


Tom (USA site not near as many diesels as other places in personal vehicles BTW)



lee24
Novice

Aug 13, 2020, 6:52 AM

Post #5 of 12 (216 views)
Re: Mazda 5 .. engine shuts on and off Sign In

The alternator didnt hit the chassis, the pulley came off the alternator and jammed against the chassis causing the alternator belt to come off the pulley and jam. The alternator belt runs next to the cam belt. im not saying the alternator belt caused the cam belt to jump a tooth, all i know is that when i checked it, it was a tooth out.


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Aug 13, 2020, 7:19 AM

Post #6 of 12 (210 views)
Re: Mazda 5 .. engine shuts on and off Sign In

OK: I'll stay out now after this just if cam belt could jump now IDK how you know if it jumped many teeth then jumped back or what but that's the problem now.
Said by nature a diesel needs to have such high compression that's really the heat to fire fuel. If a valve is bent or damage for any reason there goes your compression you'll find it low either evenly or just one or more? That's real damage and sometimes fatal to an engine!


Hope not let another suggest that's the problem by your description now,


Tom



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 13, 2020, 8:49 AM

Post #7 of 12 (203 views)
Re: Mazda 5 .. engine shuts on and off Sign In

OK, we don't have that option here in the US and diesel isn't my specialty but this thing has all the signs of fuel starvation which, in a diesel can do major internal damage.

I know you have a belt driven high pressure fuel pump but you should also have an "in tank" supply pump that I would be highly suspect of. You should be able to test the fuel pressure for that part of the system.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



lee24
Novice

Aug 13, 2020, 9:59 AM

Post #8 of 12 (191 views)
Re: Mazda 5 .. engine shuts on and off Sign In

Ok that gives me something to check. But shouldnt that cause a fault code?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 13, 2020, 11:29 AM

Post #9 of 12 (188 views)
Re: Mazda 5 .. engine shuts on and off Sign In

No, it won't. There is nothing electronic to monitor with low fuel pressure.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



lee24
Novice

Aug 14, 2020, 2:02 AM

Post #10 of 12 (130 views)
Re: Mazda 5 .. engine shuts on and off Sign In

Well ots booked in mext wednesday for a fuel pressure test. So.. if the pressure is low does it basically mean just a new pump? Is there anything else that could cause the pressure to drop?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 14, 2020, 4:01 AM

Post #11 of 12 (122 views)
Re: Mazda 5 .. engine shuts on and off Sign In

There are always other possible causes like tank problems, wiring problems, connection problems, relays, line restrictions, etc



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
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Aug 14, 2020, 4:41 AM

Post #12 of 12 (114 views)
Re: Mazda 5 .. engine shuts on and off Sign In

I just re-read top post on this that began with a belt problem and damage may be the clue at the solution right there?
Fuel, diesels (for what I know isn't way too much) doesn't like water in it I think many tanks would or used to come with a drain to get it out? Fuel filters had a drain as well was also to purge air out or they didn't run well or at all for a while just changing one.
So all of those with impact of parts flying off from the alternator trying to find some connection to all this? Bent line near there?
It's possible the test you scheduled if a pro (would be I hope) know this history look around it began from damage let's not lose sight of that now,


Tom






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