Automotive

2007 Mazda6 high rpm at high speeds

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  • Sep 26th, 2020 9:59 pm
[OP]
Newbie
Aug 28, 2007
93 posts
29 upvotes
Toronto

2007 Mazda6 high rpm at high speeds

So I have an older 2007 Mazda6 (I think it's 2007, that's what's on the insurance slip, it could be 2008).

So at <100kmph, the rpms will initially go to like 2500, but then decrease to <2000 after a few seconds. But once the car goes over 100kmph the rpms only goes up. eg. at 120, the RPM would be 2800, at 130, 3000+ etc. And it never goes back down if I maintain the same speed.

Even if I let go of the accelerator, the RPM still does not drop to below 2000 until the speed has decreased to <100kmph.

I've driven some newer cars and this is never the case. ie if I let go of the accelerator, the rpms usually goes right down to 1500 since it's no longer accelerating the car.

Is this normal for older cars?
30 replies
Deal Addict
User avatar
Mar 7, 2007
3675 posts
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Sounds like something is not right, but you need to try a few things.

Replace air filter, clean the MAF or mass air flow sensor (which is next to the air filter), and clean the throttle body.

The above is easy to do, and very cheap, so you don't lose anything (other than 15 to 30 mins of your time).

It could be the injectors, or another sensor, but that is not that easy to do.
Deal Addict
May 23, 2009
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Mississauga
Sounds normal to me for the Mazda6 when over 100kph, its a five-speed automatic transmission.
Sr. Member
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Jun 24, 2005
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Richmond Hill
Maybe this sounds stupid, but maybe you have it in sports mode, or maybe you pressed the overdrive button on the transmission stick by accident (if you have a button).
Deal Addict
Jun 14, 2008
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Montreal
Aren't Mazda more aggressive on locking torque converters? If they don't unlock while you let gas pedal go, it would behave that way.
Sr. Member
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Dec 6, 2017
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Manitoba
Seems like normal A/T behavior....Engine and Tranny usually "uncouples" at 50kph.
one more deal and I'm out * involuntary tick*.... :twisted:
[OP]
Newbie
Aug 28, 2007
93 posts
29 upvotes
Toronto
rngun wrote: Maybe this sounds stupid, but maybe you have it in sports mode, or maybe you pressed the overdrive button on the transmission stick by accident (if you have a button).
don't have any of those. it's 2007, pretty old car.
[OP]
Newbie
Aug 28, 2007
93 posts
29 upvotes
Toronto
bubuski wrote: Sounds normal to me for the Mazda6 when over 100kph, its a five-speed automatic transmission.
it is 5 speed automatic. wasn't sure if this is a common occurrence.

The check engine light comes on if I leave it at >3000rpm for a while though.

the light goes off if I run at <3000rpm for a few days.
Deal Fanatic
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Jul 26, 2007
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Toronto
Sounds like your clutch packs isn't disengaging in certain gears when foot is off the gas.
Deal Expert
Mar 23, 2004
27422 posts
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Accelerator position has nothing to do with it. Engine RPM is a function of wheel rotational speed (i.e. vehicle speed) and gearing. If the RPM is different than expected and you didn't change your tyre size, then either the trans is not shifting, the trans is slipping, or the torque converter is not locking up.
Deal Expert
Jan 15, 2006
15055 posts
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Richmond Hill
raven0usvampire wrote: So I have an older 2007 Mazda6 (I think it's 2007, that's what's on the insurance slip, it could be 2008).

So at <100kmph, the rpms will initially go to like 2500, but then decrease to <2000 after a few seconds. But once the car goes over 100kmph the rpms only goes up. eg. at 120, the RPM would be 2800, at 130, 3000+ etc. And it never goes back down if I maintain the same speed.

Even if I let go of the accelerator, the RPM still does not drop to below 2000 until the speed has decreased to <100kmph.

I've driven some newer cars and this is never the case. ie if I let go of the accelerator, the rpms usually goes right down to 1500 since it's no longer accelerating the car.

Is this normal for older cars?
Ah what? All new cars at highway speeds will have the torque converter locked up, so even if you release the throttle the RPM's will not go down to near idle speeds. What you're describing is how old inefficient automatics behaved.
Deal Guru
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Feb 11, 2007
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Oakville
raven0usvampire wrote: So I have an older 2007 Mazda6 (I think it's 2007, that's what's on the insurance slip, it could be 2008).

So at <100kmph, the rpms will initially go to like 2500, but then decrease to <2000 after a few seconds. But once the car goes over 100kmph the rpms only goes up. eg. at 120, the RPM would be 2800, at 130, 3000+ etc. And it never goes back down if I maintain the same speed.

Even if I let go of the accelerator, the RPM still does not drop to below 2000 until the speed has decreased to <100kmph.

I've driven some newer cars and this is never the case. ie if I let go of the accelerator, the rpms usually goes right down to 1500 since it's no longer accelerating the car.

Is this normal for older cars?
Sounds like you're expecting more gears like newer cars have. My 5 speed is also doing about 3500rpm at 130kph.
[OP]
Newbie
Aug 28, 2007
93 posts
29 upvotes
Toronto
ok. thanks for the info.

I was just a bit worried cause it's an older car and there are transmission problems as well so I wasn't sure if it was normal to be pulling those kinds of RPMs.
Deal Addict
May 23, 2009
2586 posts
1071 upvotes
Mississauga
raven0usvampire wrote: it is 5 speed automatic. wasn't sure if this is a common occurrence.

The check engine light comes on if I leave it at >3000rpm for a while though.

the light goes off if I run at <3000rpm for a few days.
This is different. Find a good mechanic to take a look

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