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Old 02-01-2001, 03:21 PM   #1
PURE EPI
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Exclamation Power Dips In the 3-4K range

I frequently experience power dips in the 3-4000 RPM range. no shuddering, no stalling, just a los of 50-70% power until about 4000-4100 RPM. this usually happens @45% - full throttle. Does this have anything to do with defective Ignition coils? the car has 41k on it and no change in plugs or wires.(got her used) She's due for an oil change, so should i change everything? please help!!! I don't want her to die!!

any help you can provide is always appreciated, simple fixes first

[This message has been edited by PURE EPI (edited February 01, 2001).]
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Old 02-01-2001, 03:24 PM   #2
stimpy
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The only I can think of is doing a search for "hesitation" and that should probably give you some help. Not sure if that will help or not.
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Old 02-01-2001, 03:56 PM   #3
ColinL
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41k miles? What year is it?
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Old 02-01-2001, 04:08 PM   #4
PURE EPI
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MY99..... what can i say... I like driving it!! scratch that....... I LOVE DRIVING IT!!!
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Old 02-01-2001, 04:12 PM   #5
Xio
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Might try an ECU reset...
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Old 02-01-2001, 04:21 PM   #6
PURE EPI
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done that already... twice. i had a mishap and had to replace the fuel evap canester. about two days after it happened... the check engine light came on. when the oil was changed, i asked them to look at the lght and see. they reset the ECU i suppose becuse it went away( the light) and i asked them to checkinto that DIp in the power. they said nothing was wrong. after getting the car back. i got the same problem over again.. and to boot the CE light came on eagain!!!! (i had not yet replaced the smashed FEC ) when i finally did. i had them reest the ECu which i suppose it what you do to turn off the CE light, and this itme it stayed off. but i still have the DIP!!! Damn It!!! She;s due for an oil change so i'll replace the plugs and wires too. anyone know where to ge them? besides Subaru? are they special due to distr.less Ignition?
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Old 02-01-2001, 04:33 PM   #7
ColinL
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It is probably about the point where replacing the plug wires could be beneficial, so consider that. Personally I'd buy stock wires again from QSubaru or Troncalli. I advocate changing plugs every 15,000 to 25,000 miles for optimum performance and fuel economy.

You also are way overdue for a fuel filter if that hasn't been changed at least once... that could certainly cause hesitation. Another possibility is bad gas-- too low octane, too much (in winter), oxygenated gas in general, water in the fuel...

And sadly, another likely possibility is the fragile MAF sensor.

[This message has been edited by ColinL (edited February 01, 2001).]
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Old 02-01-2001, 05:22 PM   #8
gavin
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You don't say what kind of car you have. There is a hesitation problem involving the knock sensor on the 1997 and 1998 2.5 engines which results in power loss around 3-4k RPM.

The Subaru fix is a new ECU. There is an aftermarket hack floating around that essentially splices resistors in to impeded the line signal from the knock sensor to the ECU. I couldn't find the URL in a search. Gary's page appears to be gone.

Anybody have the info on this?

Here's more info:
http://www.raindrop.com/subaru/problems.html#accel

[This message has been edited by gavin (edited February 01, 2001).]
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Old 02-01-2001, 06:13 PM   #9
Strepto
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is your intake modified at all?
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Old 02-01-2001, 07:23 PM   #10
gtguy
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Sounds like the dreaded hesitation to me, too. The fix is easy and dependent upon mileage, should be under the 60K powertrain warranty.

Kevin
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Old 02-01-2001, 08:00 PM   #11
richeich
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What kind of air filter or intake are you using? I used to notice a dip in that same range in my wife's Outback (automatic), and it went away when I replaced the paper element panel filter with a high flow aftermarket filter. Something like a K&N or Amsoil filter should do it. I must admit, I didn't think the dip was that bad, but it was noticeable. All the other stuff sounds good too. Just another option.

Good luck, let us know what you find-
Rich
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Old 02-01-2001, 08:15 PM   #12
PURE EPI
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WEll... the car has an extended warranty on it. So i'll try to get the dealership to fix it... have to wait though, the Subaru Dealership changed owners/locations... I'll have to tell them that i have had this problem before and nothing has come of it... it they want they can call Subaru Directly and confirm this problem with them... just as long as they fix it... sound good?
The car is stock by the way... But not for long!!
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Old 02-02-2001, 01:46 AM   #13
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And what is the easy fix to my 2.5Rs hesitation problems? Please explain.
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Old 02-02-2001, 06:32 AM   #14
gtguy
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The "easy way" is to take it to the dealer and have them fix it under warranty. Takes less than an hour to replace the sensor that goes bad on some of the 2.5 engines.

Do a search on "hesitiation" and you'll find which sensor. I've since forgotten. It's been a while since anyone's had the problem.

Kevin
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