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Old 09-07-2012, 06:00 PM   #1
RobSTI89
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Default Power cut at 5500rpm wont go past 5500rpm

I bought a completely stock 2005 Sti 130k pulls strong up to 5500rpm once it hits that it's loses power and won't go past 5500rpm no matter how much into the pedal. I changed plugs and coils new air filter cleaned maf. I got a check engine light misfire 2 3 4 cylinders goes away as soon as I go under 5500rpm.

Could it be cam sensor or crank sensor even tho it doesn't throw a code for either one of those sensors? Or how about injectors how could I test those?

Thanks I tried searching btw found similar problems but no answers. Car runs so nice till 5500
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Old 09-08-2012, 03:43 PM   #2
SubieWolfSti
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Hmm, Kinda interesting because it could be the CPU initiating a safety feature so its doesn't damage the engine since its misfiring multiple times past 5500RPM range. The reason i say this is because i've worked on a car that when it reads the engine overheating, it will shut down the car in order to prevent damage. Do you have any previous repair records of the vehicle? That may help you find the right area to start investigating.
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Old 09-09-2012, 09:05 AM   #3
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So I tried putting stage one so I knew it was a good map and no luck. Swapped cam sensors n cranks sensor no luck. Gapped plugs smaller ... Plugs are white when I pull them out tho
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Old 09-09-2012, 10:11 AM   #4
the suicidal eggroll
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I had a friend a while back who had this problem, after tracking it down for a full year it turned out to be one of the cam sensors. When you swapped them, did you swap them with known good ones or just with each other?
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Old 09-09-2012, 12:38 PM   #5
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Swapped them with another set of good one off a running car. Only thing I noticed was there is a cut abs sensor wire I highly doubt that could be a problem ? Any thoughts
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Old 09-09-2012, 12:45 PM   #6
apjacks1
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Had a similar issue on an 06 wrx.. Needed to replace the maf (this was a brand new new one) so didn't bother trying to clean it.
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Old 09-09-2012, 12:49 PM   #7
SubieWolfSti
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It does sounds like the ECU is limiting the the rpm, im assuming there are no other P-codes in the car. What does the flash data say?
Are all signals going to the injectors and coils correct?
Does the car always run good under 5500 RPM when the engine is warm and cold?
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Old 09-09-2012, 01:00 PM   #8
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When you first start driving it it goes to 6200k as u drive it the Rpms get lower. I will try maf I have a spare
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Old 09-09-2012, 01:20 PM   #9
SubieWolfSti
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Well you have so far eliminated the cam and crank sensors, in the process of eliminating the maf. at this point you'll have to look at other parts that these cylinders share like the TP sensor. As time goes on and heat cycles take a toll on electeical wires they can cause intermittent problems. So if you haven't checked the injector pulse and Coil wavelength, it could be a break in the wire. the interesting part is that they all have different wires going to the ECM but the injectors share a common wire which if cracked internally could cause an intermittent issues as far as fuel delivery.
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Old 09-10-2012, 12:05 AM   #10
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Does the car rev past 5500 rpm if you gently accelerate or if you gently rev it in neutral? Does the car buck and jerk at 5500 rpm or does it feel like the power just fade away and stop accelerating at 5500rpm?

A log of this occurring would be really helpful, but my guess is that you don't have the equipment to take care of that.
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Old 09-10-2012, 01:31 PM   #11
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It's bucks n jerks !! And it will rev past 5500 in neutral fine no check engine light only when wot while moving. I have an ap i can log with nvr done it b4 tho
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Old 09-10-2012, 03:14 PM   #12
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You may have an issue with a coil pack....
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Old 09-10-2012, 06:54 PM   #13
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Nah i swap coils with another sti that runs perfect i talked to a tech at subaru and he is pretty sure its the waste gate making it do this so i ordered one up.
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Old 09-10-2012, 08:04 PM   #14
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The subaru tech is an idiot. The wastegate cannot cause the problem you're describing.
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Old 09-10-2012, 11:55 PM   #15
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Well idk I have tried everything cam sensors crank maf coils plugs good fuel pressure changed fuel filters air filers nothing helps so we will give the waste gate a try. I kinda thought it make sense cuz it only does it under full boost at 5500rpm in neutral it's revs fine past 5500rpm
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Old 09-11-2012, 02:00 AM   #16
Derrickae86
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Cousin had the same problem and it turned out to be a tgv sticking on one bank. Worth checking?
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Old 09-29-2012, 05:57 PM   #17
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Problem Solved clogged cat. Swap dp and runs great!!!
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Old 09-30-2012, 09:58 PM   #18
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Clogged cat on a stock STi?

Are you sure it wasn't tuned before you bought it and returned to stock?
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Old 10-01-2012, 06:57 AM   #19
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Idk my accessport hooked up fine so ecu wasn't locked runs great.. As soon as I took it off pieces of the Cat started break up and falling out
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Old 10-02-2012, 08:26 AM   #20
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Bring it home for me. Why would a clogged cat cause these symptoms?
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Old 10-02-2012, 08:37 AM   #21
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I have no idea too much back pressure still confused y it didn't throw a cat code... I changed every sensor on the car waste gate re flashed it plugs coils fuel pumps filters nothing worked but I swapped dp with another oem one and car pulled to 7grand no check engine light ??? You tell me
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Old 10-02-2012, 09:04 AM   #22
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I had an issue like that but it was a fuel cut, the maf was being outrun. The boost reference hose on the turbo outlet to the boost controller was split open
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