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2007 Mazda CX-7 Dies under Load

  • Babynana
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4 years 8 months ago #46747 by Babynana
Replied by Babynana on topic 2007 Mazda CX-7 Dies under Load

Wightscope wrote: Fuel pressure / flow would be my main suspect. When was the filter last replaced ?
You might have static pressure that can fall off a cliff as soon as flow is needed. Graph the pressure against rpm and see if the FP drops out first

Other thought would be that the drive train is locking up, effectively stalling the engine.


I will try the fuel pressure. But if the drive train is locking up, would that have anything to do with it also stalling when turning the wheel in park.

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4 years 8 months ago #46749 by Babynana
Replied by Babynana on topic 2007 Mazda CX-7 Dies under Load

Wightscope wrote: Fuel pressure / flow would be my main suspect. When was the filter last replaced ?
You might have static pressure that can fall off a cliff as soon as flow is needed. Graph the pressure against rpm and see if the FP drops out first

Other thought would be that the drive train is locking up, effectively stalling the engine.


I will try the fuel pressure. But if the drive train is locking up, would that have anything to do with it also stalling when turning the wheel in park.

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4 years 8 months ago #46750 by John Curtis
Replied by John Curtis on topic 2007 Mazda CX-7 Dies under Load
Scope 4 channels
cam, crank, injector and ignition. injector and ignition scope somewhere where you can see all of them. See what you are losing. Best way to gain direction.

Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
The following user(s) said Thank You: Wightscope

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4 years 8 months ago #46753 by Wightscope
Replied by Wightscope on topic 2007 Mazda CX-7 Dies under Load
Ahh sorry missed that about the PS, disregard then.

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4 years 8 months ago #46766 by JJJ DA
Replied by JJJ DA on topic 2007 Mazda CX-7 Dies under Load
kat blocked? try driving with MAF disconnected (maybe doesn't crank or maybe works with load slightly better)

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4 years 8 months ago #46797 by 70monte
Replied by 70monte on topic 2007 Mazda CX-7 Dies under Load

JJJ DA wrote: kat blocked? try driving with MAF disconnected (maybe doesn't crank or maybe works with load slightly better)


Sounds like car will not drive at all because as soon as he puts it into drive it dies so doing any test by driving this car is out of the question.

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4 years 8 months ago #46958 by Babynana
Replied by Babynana on topic 2007 Mazda CX-7 Dies under Load

70monte wrote:

JJJ DA wrote: kat blocked? try driving with MAF disconnected (maybe doesn't crank or maybe works with load slightly better)


Sounds like car will not drive at all because as soon as he puts it into drive it dies so doing any test by driving this car is out of the question.


I"m outside memphis, we have had ice storm and snow storms... We aren't used to it. We are trying to dig out. We got over 11inches where I am and everything has been frozen. It was a layer of about 2 inches of ice then 11" of snow... I cannot drive it, As soon as you put it under load it dies. I did disconnect the MAF a while back and it still ran just not as good.

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