Problem: Acceleration Hesitation - Mazda3 Forums : The #1 Mazda 3 Forum
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post #1 of 41 (permalink) Old 02-27-2004, 09:38 AM Thread Starter
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Problem: Acceleration Hesitation

Anyone else experiencing hesitation during hard acceleration. it is faint, not like a misfire. i have had it over several tanks of gas, so i doubt that was the issue. Maybe the fuel pump?

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post #2 of 41 (permalink) Old 02-27-2004, 12:28 PM
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engine hesitation

I have about 3600 km on my car.. bought in Canada... I noticed for the first tank or two the power on the car was great.. but now, i am noticing slight sluggish performance.. i really notice it in first gear.. sometimes i experience a 'faint' flat spot at 3000 rpm under hard acceleration. Usually in the first gear the tires are slipping a bit and really grabbing for traction.. now i notice i can pin it in first gear and it just goes 'averagely' up in rpm's.. nothing to write home about and different from when i first got it. my cel was on anyway (dealer found the thermostat broken), so i attributed it to that. since it was replaced yesterday, the sluggish performance and a little 'soft spot' was still at 3000 rpm, Although the cel was now off.. anyway, took it back to the dealer and told him the head mechanic.. we decided to test a new car and my car.. we drove both cars to feel if there was a difference.. the mechanic agreed with me that the car felt sluggish, but just barely noticable yet definetely not normal.. He said he hasn't heard anything like that before with this car and they were still learning through consumers about problems.. He asked me what kind of gas i put in i.e. brand, not octane and I put in discout carrier fuel.. i.e. centex here in calgary.. he was convinced this was the problem, as discount carriers recieve the bad batches of fuel from major carriers like petro canada (good), esso (best), shell (good but high sulpher).. as long as the 20% of the batch meets the standards, they can sell the batch to discount carriers.. this gas can be sitting for months, but as long as it meets the 20% standard, it's good to go.. but the major companies won't sell that fuel to their customers.. anyway, point is fuel apparently makes big difference.. and i plan on going through this bad tank and switching to major supplier.. probably esso.. we'll see..
as for the minor flat spot in the 3000 rpm stage in first gear acceleration, its noted on my file and they will continually look for flash updates for the ecu/pcm/ or whatever the related computer is called in my car.. could just be gas or something..

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post #3 of 41 (permalink) Old 02-27-2004, 11:15 PM
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Re: engine hesitation

Quote:
Originally Posted by "Brockett or bust"
...petro canada (good), esso (best), shell (good but high sulpher)
shell has one of the lowest sulphur contents, they upgraded their refineries a few months back to deal with upcoming regulations

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post #4 of 41 (permalink) Old 02-28-2004, 12:28 PM
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Problem: Acceleration Hesitation

Car and Driver mag had an article reviewing the 3. They said that it seemed to them that it wasn't moving as fast as it should but realized that it was because the engine is so quiet (electronically controlled) and there is very little sound to make you think the engine is working hard.

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post #5 of 41 (permalink) Old 02-28-2004, 06:45 PM Thread Starter
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Problem: Acceleration Hesitation

Actually its not so much that the car feels low on power (at least in my case), but more uneven power delivery. It seems to shudder, just enough so that it can be noticed, but not really enough to cause it to jerk around. I assumed gas at first, but this is my third tank (all Esso/Shell), and it still does it occasionally. Anyway, the thing has to go in cuz now the airbag light is on, maybe they can find something.
Still love the car

titanium M3 Sport GT 5-Spd
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post #6 of 41 (permalink) Old 02-28-2004, 10:40 PM
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Problem: Acceleration Hesitation

Quote:
Originally Posted by "gandrigo"
Actually its not so much that the car feels low on power (at least in my case), but more uneven power delivery. It seems to shudder, just enough so that it can be noticed, but not really enough to cause it to jerk around. I assumed gas at first, but this is my third tank (all Esso/Shell), and it still does it occasionally. Anyway, the thing has to go in cuz now the airbag light is on, maybe they can find something.
Still love the car
i know exactly what ure talkin bout, especailly at lower rpm's right?
its never really bothered me, but if your dealer does find something keep us posted

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post #7 of 41 (permalink) Old 02-29-2004, 08:24 PM
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Problem: Acceleration Hesitation

It really bothers me, it just does not seem natural. I'm surprised there haven't been more topics on this. This is the first car I have had where this occurs.
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post #8 of 41 (permalink) Old 02-29-2004, 09:16 PM
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Problem: Acceleration Hesitation

Quote:
Originally Posted by "gandrigo"
Actually its not so much that the car feels low on power (at least in my case), but more uneven power delivery. It seems to shudder, just enough so that it can be noticed, but not really enough to cause it to jerk around. I assumed gas at first, but this is my third tank (all Esso/Shell), and it still does it occasionally. Anyway, the thing has to go in cuz now the airbag light is on, maybe they can find something.
Still love the car
I noticed this when I was driving the loaner 3s (I had it for 3 days and abused it). There were definitely some lag in parts of the powerband, very lumpy acceleration. I'm glad that mine didn't have this problem. I don't think it was the gas because the dealer gave me a free tank of gas at the same place where they fill the loaner up. So, I think it comes down to the fact that not all Mazda3s are created equal.


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post #9 of 41 (permalink) Old 02-29-2004, 09:30 PM
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Problem: Acceleration Hesitation

I've noticed that when the engine is cold I get a big surge of power at 3,000rpm. It almost reminds me of a big 2 stroke dirt bike's power band. But once it warms up the power seems pretty seamless through the entire rpm range

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post #10 of 41 (permalink) Old 03-01-2004, 12:27 AM
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Problem: Acceleration Hesitation

Where does the variable valve timing kick in? I've always noticed that power seems to "hit" at around 3200rpm.

Also, I noticed a hesitation of sorts today when I'd romp on the gas in 1st gear. It was almost like the car would cut power, then launch. Very odd behavior, but repeatable. It happened only in 1st gear, and only at low RPMs. I'll have to play with it in a non-traffic area sometime.

As I didn't buy this one to be my sports/sporty car, I don't really mind, but it's still odd behavior. A dyno would be great to look into this with.

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