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Old 12-28-2009, 04:30 PM   #1
2.5izzy02
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Unhappy Limp mode, but no CEL?

2002 WRX, won't rev past 4000-4500rpm.
Basically you hit the throttle to go past those rpms and it "bogs" as if it's being choked.
What would this be caused by? The car was previously hooked up to an AP running Stage 2 (which I no longer have).
I figured it was electrical, wires, or even the MAF sensor?
Any help would be greatly appreciated.
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Old 12-28-2009, 04:33 PM   #2
JSarv
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Your TGV's are not working properly.

-Jerod
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Old 12-28-2009, 04:41 PM   #3
2.5izzy02
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What would be the fix for this? The car ran fine, but then we had some foggy weather and ever since then the car has been misbehaving.
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Old 12-29-2009, 02:48 AM   #4
2.5izzy02
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Can someone direct me to a "fix thread" or something?
I searched, but couldn't find anything relevant.
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Old 12-29-2009, 02:56 AM   #5
Franks2308
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no cel's huh? Wanna throw down a list of mods so we can see what you're working with?
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Old 12-29-2009, 03:56 AM   #6
Haelan
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I disagree about the TGV's. OP would most certainly have a CEL if one was not working properly.

Start with the basics: check for any pending codes in the ECU, pressurize the air intake tract and look for leaks.
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Old 12-29-2009, 10:04 PM   #7
2.5izzy02
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CEL comes on for P0546 (EGT code), but nothing else.
Performance mods: full catback, weapon R intake, BOV, aftermarket intercooler...
Pretty sure that's it. I've been told MAF sensor, fuel injectors, fuel pump and now TGV.
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Old 12-30-2009, 08:38 AM   #8
S7un7
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Did you replace the stock uppipe with a catless or gut the stock one? That code is related to the uppipe. There could be a serious problem or the sensor is bad. An easy fix is to unplug the EGT sensor and put a 2.2 K Ohm resistor in the end of the plug.

If you ever go with a TBE, I would suggest removing the sensor from the uppipe and gutting it (or replace with a catless) so it does not kill your turbo.
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Old 12-30-2009, 05:53 PM   #9
2.5izzy02
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So is the EGT code related to it bogging at 4000-4500rpm?
It didn't seem like it was because it started happening when it became foggy.
That's why I thought it was an electrical problem.
Should I just take it to a dealership for a diagnosis?

Also, I never did the catback mod/install, so I have no clue what's on there.
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Old 12-30-2009, 06:31 PM   #10
Haelan
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My guess is your MAF is extremely dirty or shot.

The EGT sensor will cause your vehicle to transition to open loop if the temperatures get too high. This should not cause your bogging issue.
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Old 12-30-2009, 06:37 PM   #11
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Well, the more I think about it...
MAF would make sense because that should be on my intake correct?
The weapon R intake I have is fairly dirty and the plastic on the wheel well is missing, so the sensor might have been damaged if the intake sucked in crap from there being an opening there the size of a basketball.
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Old 12-31-2009, 10:50 AM   #12
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The Weapon-R intake is also complete garbage and isn't helping the situation with the pos foam filter they use.
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Old 01-14-2010, 09:18 PM   #13
2.5izzy02
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Car is fixed, quite simple actually.

I disconnected the battery (resets the ECU) and now the car runs very nicely.
Still gets the EGT code mind you...

Also returned the intake to stock before I reset it, so that could have helped a bit.
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Old 01-14-2010, 09:42 PM   #14
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Edit: Missed the part that you swapped the intake. That was probably the true reason for your issues.
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Old 04-09-2014, 12:50 PM   #15
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I fought for two months trying to figure my car out. I put an accessport on the car and it stopped revving past 4500-5000 rpm. Tried everything. Found out that the ecu wasn't recognizing my boost control solenoid. It was tested and fine. The thing that was eventually learned was I unplugged the bcs turned the car on, reved it as high as it would go(5000) a couple times, then turned it off. I plugged the bcs back in and turned the car back on and it revved to redline smooth as ever. I am no expert but countless hours if research on these forums with trial and error worked for me this time
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Old 04-09-2014, 05:32 PM   #16
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you don't need to resurrect every thread that is remotely similar because you found a solution that worked in your case.
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Old 04-09-2014, 05:40 PM   #17
timandally
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See, if I dindn't the next guy looking for help or information would be stuck like I was. Working on your own stuff can be daunting and your glad to try someone's personal experiance. Most forums are personal experiance.
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Old 04-09-2014, 06:53 PM   #18
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^the next guy could use the search option and find his answer. if you keep resurrecting threads people that are actually looking for help on this section of the forum will not get help because some Monsieur. butt cheeks resurrected 2 pages worth of old threads.
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