Low RPM stutter
06-04-2014, 06:55 PM
#1
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Low RPM stutter
Lets get this out of the way.
I've also tried a little google and m.net without any real solid feedback.
So on my completely stock 2001 Miata i've been having a bit of a stutter issue.
The stutter occurs between 1000-2000rpm under heavy to heavyish load / acceleration. It's almost always worse after it's warmed up.
As soon as it's 2000rpm + it pulls just as **** *** slow as a stock miata should without any issues. (though i do feel that my 94 stock was quicker than this 01, perhaps weight difference)
Car has 70k miles and the plugs were changed and gaped correctly, new fuel filter, new rear O2 sensor. Oil change, air filter, and other general maintenance.
It seems pretty simple but i'd like to know if anyone else has had issues similar on stock 01's before i go throwing money at it.
I'd like to think one or both of the coils have gone funny, but my logic and knowledge tells me that if a coil were to go bad it would just die. Maybe not? Coils are a bit to expensive for me to just replace without a little more input. I've heard everything from crank sensor to O2 sensor. The car throws no code either.
I've also tried a little google and m.net without any real solid feedback.
So on my completely stock 2001 Miata i've been having a bit of a stutter issue.
The stutter occurs between 1000-2000rpm under heavy to heavyish load / acceleration. It's almost always worse after it's warmed up.
As soon as it's 2000rpm + it pulls just as **** *** slow as a stock miata should without any issues. (though i do feel that my 94 stock was quicker than this 01, perhaps weight difference)
Car has 70k miles and the plugs were changed and gaped correctly, new fuel filter, new rear O2 sensor. Oil change, air filter, and other general maintenance.
It seems pretty simple but i'd like to know if anyone else has had issues similar on stock 01's before i go throwing money at it.
I'd like to think one or both of the coils have gone funny, but my logic and knowledge tells me that if a coil were to go bad it would just die. Maybe not? Coils are a bit to expensive for me to just replace without a little more input. I've heard everything from crank sensor to O2 sensor. The car throws no code either.
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06-05-2014, 09:14 AM
#7
I just drove my car to work and was thinking of your "1k-2k rpm" claim.
How the heck do you even keep the car that low? lol
Just curious, cause my commute is all city, and usually 45-50mph, and I still can't get it to stay under 2k aside from a split second in 1st gear, even if I "lug" it.
just another random observation
How the heck do you even keep the car that low? lol
Just curious, cause my commute is all city, and usually 45-50mph, and I still can't get it to stay under 2k aside from a split second in 1st gear, even if I "lug" it.
just another random observation
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06-05-2014, 04:20 PM
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Eh, i kinda drive it like an old man. I'm used to having a torquey american car.
Normally it's just getting up to speed, or if i slow down in gear and don't downshift.
I'll see if i can get a little video of it. It's pretty apparent and embarrassing when leaving a light misfiring.
Normally it's just getting up to speed, or if i slow down in gear and don't downshift.
I'll see if i can get a little video of it. It's pretty apparent and embarrassing when leaving a light misfiring.
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02-11-2015, 04:43 PM
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Bump.
So this seems to be getting a little worse.
Same story, when it's cold in the morning it drives fine. Once i drive my 30 miles home and if i'm driving like an ***, high RPMs, really putting a heavy load on the engine it is the worst.
If i come to a light and do a nice low rpm start without over revving and doing a "jack rabbit" start it will sputter and missfire like crazy. What could get heatsoaked / hot that would cause this, BUT only within 1000-2000rpm? Could be the new O2 sensor i put in, not working properly? MAF? Coils? Maybe something with these crazy butterflys my car has on the intake?
So this seems to be getting a little worse.
Same story, when it's cold in the morning it drives fine. Once i drive my 30 miles home and if i'm driving like an ***, high RPMs, really putting a heavy load on the engine it is the worst.
If i come to a light and do a nice low rpm start without over revving and doing a "jack rabbit" start it will sputter and missfire like crazy. What could get heatsoaked / hot that would cause this, BUT only within 1000-2000rpm? Could be the new O2 sensor i put in, not working properly? MAF? Coils? Maybe something with these crazy butterflys my car has on the intake?
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02-12-2015, 07:16 PM
#17
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MAF cleaner spray stuff in a can...
I drive the NB all year round. Probably why i have stupid little issues like this, it's really not meant for 16 inches of snow.
I drive the NB all year round. Probably why i have stupid little issues like this, it's really not meant for 16 inches of snow.
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02-12-2015, 07:29 PM
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I tried backing mine out of the garage the other day to make room for a side job, and I got stuck in the driveway after I had already shoveled! It probably doesn't help that I have bf rivals though? You sir are a brave man.
Like someone above already mentioned, have you checked the air gap between the crank sensor and the reluctor wheel on the crank pulley?
I had an issue with my 99 a couple years back where the crank sensor wiring that plugs into the main harness had the insulation rubbed off of it by the little hold down clip that keeps it away from the belts. It left the wiring exposed and every time it rained or I ran over a puddle it would start acting up the way you're describing. I never got a code either because it was so random and I rarely drove in the rain to begin with.
Like someone above already mentioned, have you checked the air gap between the crank sensor and the reluctor wheel on the crank pulley?
I had an issue with my 99 a couple years back where the crank sensor wiring that plugs into the main harness had the insulation rubbed off of it by the little hold down clip that keeps it away from the belts. It left the wiring exposed and every time it rained or I ran over a puddle it would start acting up the way you're describing. I never got a code either because it was so random and I rarely drove in the rain to begin with.
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02-12-2015, 07:33 PM
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I haven't checked that yet. Seems to be weird that it's related to heavy driving, weather it's 100F out or 3F out.
I drive from allen park to monroe for work too. So it's not like i'm just going down the street. The day we had all that snow a week or two ago i had to back down 3 freeway entrance ramps because of other people being stuck... With enough wheelspin this car can get through just about anything.
I drive from allen park to monroe for work too. So it's not like i'm just going down the street. The day we had all that snow a week or two ago i had to back down 3 freeway entrance ramps because of other people being stuck... With enough wheelspin this car can get through just about anything.
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