Engine cuts out above 5000 RPMs

[Stealth Bomber]

Really?! I would think that would be kind of dangerous? I just asked him anyway and he said its at 7. This motor spun to over 8 on factory tune but it has the 02 WRX ecu. This issue just really makes no sense to me. All I can think of its the in the head and a valve is bad or something. I just wish I at least had a check engine light to have a clue. Im gonna drop the car off at their shop and have them dive in- leak down test, check fuel pressure, hopefully not have to build me a new 2.1 stroker....

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[the suicidal eggroll]

Originally Posted by flores412

Just like loyal93 said rev limiter I set way low. Have it tuned I bet that's what it is.

Have you even bothered to read the thread? He's had it tuned THREE times already.

Originally Posted by flores412

No because mine is set to 6200 to 6500 until I get bigger injectors, tuners or I know my tuner set the rev limiter there so I don't lean my motor out and blow it. But no it won't be set at a specific rpm it will move a little.

Not like he's seeing. The rev limiter is very consistent, it always kicks in at the exact same RPM. The RPM may bounce a hair higher before dropping back, but that's not what he's seeing. The rev limiter is most certainly not his problem.

[the suicidal eggroll]

Originally Posted by Stealth Bomber

This issue just really makes no sense to me. All I can think of its the in the head and a valve is bad or something.

This issue is VERY common. Almost everybody who's been around Subarus for a while has seen it before on their car or a friend's car. It's not the rev limiter, it's not launch control. What it IS, is very hard to say, because it seems like everyone who has this problem finds a different solution. For one person it might be the speed sensor, for another a crank/cam position sensor, for another it's a throttle position sensor, etc. It seems like it's always a sensor of some sort, but as far as I can tell there is no way to know which one without arbitrarily swapping them out until the problem disappears.

[Boosted92]

Originally Posted by the suicidal eggroll

This issue is VERY common. Almost everybody who's been around Subarus for a while has seen it before on their car or a friend's car. It's not the rev limiter, it's not launch control. What it IS, is very hard to say, because it seems like everyone who has this problem finds a different solution. For one person it might be the speed sensor, for another a crank/cam position sensor, for another it's a throttle position sensor, etc. It seems like it's always a sensor of some sort, but as far as I can tell there is no way to know which one without arbitrarily swapping them out until the problem disappears.

I would agree like I said my car was the speed sensor but this problem could be more idk I just gave my advice cause that's what my car did but also if one sensor is tripped or bad it can cause other sensor to malfunction like my car it was also misfiring because of that speed sensor but I think it's defiantly safe to say that it's not a rev limiter problem or launch control

[subie bro]

The first thing I would check :everything to do with fuel, such as sensors, gaskets, filters ,lines, injectors, rails etc..
I know its very broad but so is your problem. As some of the other members said this is a some what common problem, but everyone has had a different solution. I would start general and move into the specifics.
Something is not flowing right, and my guess would be involving A/FR. Just because your gauge or AP says you might be running the proper a/fr doesn't mean its 100% accurate. A O2 sensor could be loose throwing it off etc.. Also another common reason for engine cut or fuel cut is over boosting, check your waste-gate duty cycle.

*please note that this doesn't mean i'm right, its just what I would do, hope this helps.*

[Mr Wrex]

Idk why I didn't ask this sooner... did you check for any codes?

[some dude]

don't rev past 5000. But seriously, good luck man. I hope you find it quickly and easily.

[braveheart]

normaly , when the car wont rev above the 5k area it is caused by the vehicle speed sensor

easy way to check would be to pull the vss plug off and try the car out briefly

if there is no change at all then that is most likely the cause

[Stealth Bomber]

Thanks everyone! Ill have some time this evening to try a few more things. The crank and cam sensors we're easy to get but the vss is not so easy, not stocked anywhere and pricey. I was gonna drop it off at the tuers shop tomorrow but a may try a little more on my own. Time is precious for a working student.

[Swimminginblues]

Wondering if you got anywhere with the issue? My 02 WRX was doing the same thing, and I found it was the speed sensor. My crank sensor went out in the midst of a '06 LGT trans swap. I fixed it and then realized that we never put the speed sensor in the new trans and my car was in a sort of "limp mode." Unhook the battery and take it for a spin...see if you can rev normally. Vss replacement whenever you can, its a pain, but I have to do it too! Good luck!

[Swimminginblues]

Disregard the "wondering if you got anywhere" bit. been reading to many forums and thought this was an older one. Sorry!

[Stealth Bomber]

I tested the speed sensor today, no change. I simply don't have time to work on this rigbt now. So i dropped it off at NF performance for them to give it a go. I think they are the best option and i know they have a very good reputation, im sure they'll have it going by the weekend.

[Swimminginblues]

good luck, I am pretty much in the same boat. No time and much to do!