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Old 11-20-2000, 07:18 AM   #1
SSLegacyGT
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Member#: 2865
Join Date: Nov 2000
Chapter/Region: NWIC
Location: CdA, ID
Vehicle:
2006 Legacy 2.5i
Wagon, 5MT, Blue

Question Loss of power and engine shudder

I just returned from a trip to Vegas (from san diego). During that trip, my 97 Legacy GT (sedan) started acting up. When accelerating, I would experience a shuddering in the engine and dramatic loss of power between 1000-1500 rpms, but then the engine would seem to accelerate somewhat normally after that (sluggish but no shuddering). Also, the exhaust is heavy with fuel, like I'm running rich and when I press the gas, gray smoke comes out of the exhaust (a lot thicker than the normal exhaust, but nothing burning) Small problem at first, but it has gotten worse. Any thoughts? I don't have any mods and I havent made in changes to the vehicle since I bought it.
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Old 11-20-2000, 08:24 AM   #2
Ben
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Chapter/Region: E. Canada
Location: Markham, Ont , Canada
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2002 WRX wagon
Silver

Post

Have you install any AFC like the Apex-i Super AFC? if you do, then you may have a wrong setting!!
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Old 11-20-2000, 09:08 AM   #3
SSLegacyGT
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2006 Legacy 2.5i
Wagon, 5MT, Blue

Question

No. like I said, no mods. I'm thinking my air/fuel ratio is off though. Someone told me it may but putting too much into combustion chamber than it should, and it just may need to be corrected. Anyone ever have this happen to them?

[This message has been edited by SSLegacyGT (edited November 20, 2000).]
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Old 11-20-2000, 10:58 AM   #4
BG5
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Post

A/F ratio is under computer control so you can't do anything about that except to check the usual stuff.

I'd check/replace:
- air filter
- intake manifold for leaks
- spark plugs
- fuel filter
- vacuum lines
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Old 11-20-2000, 02:38 PM   #5
richeich
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2001 Impreza 2.5RS
Silver

Unhappy

What about an Oxygen Sensor? I recall some of the SVX guys describing a similar problem when theirs went bad. I haven't had any experience with that system, or even really understand what it does, so don't kill me if that's way out in left field. That just sounds familiar, that's all.

Rich
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Old 11-20-2000, 05:02 PM   #6
gtguy
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2005 Legacy GT wagon
Platinum Silver Metallic

Post

Sounds like a more advanced version of the famous "Subaru hesitation." Mine came, and was fixed under warranty, though it wasn't accompanied by any extra smoke. Between 1500-2500K roughly, you got the stutter, then normal acceleration. I've since forgotten what they replaced, but it was an easy fix.

Powertrain warranty is 60K, so as long as you're under that, it should be covered.

Kevin
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Old 11-20-2000, 05:37 PM   #7
Tensecgn
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Here ya go.Get a small squirt bottle of soapy water and spray around the coil pack and wires.They are very known for cracking.That is what it sounds like to me.
Tony
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Old 11-20-2000, 05:58 PM   #8
SSLegacyGT
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Wagon, 5MT, Blue

Post

Thanks for the suggestion. I read up on the knock sensor, sounds like what I have. But, there don't seem to be an real sure fixes for it. Dealer wants $70 just to look at it so I wanted to try some stuff first. I'll try resetting the ecu again, then maybe do the "Gary Fix". Thanks for the suggestions.
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Old 11-21-2000, 01:19 AM   #9
Jason
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2000 Legacy GT Ltd
WHT

Post

Maybe it is the famous knock sensor?
It will retard the ignition timing by large when knock sensor detects denotation, thus you lose a lot of power.

But knock sensor could be over reacting and causing ECU to retard timing unncessary.
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Old 11-22-2000, 10:52 PM   #10
Danno
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Location: St. Louis, MO, USA
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2002 WRX Sedan
Mithril

Question

Hi, all, I'm new to the board. I have an unmodified '97 Legacy GT sedan (but am ogling magazine previews of the WRX), just turned over 70K miles, and I am having this problem too. The first thing I did was replace the fuel filter, which is within my limited mechanical abilities, but it didn't help...took it to the dealer and they said the plug wires were bad. They replaced the wires and cleaned / regapped the plugs (I don't know why they didn't just put new plugs in, but they didn't tell me that they'd left the old plugs in until I had arrived to pick up the car). That helped some, but the problem has recurred. I checked the resistance of the coil pack and it's within tolerance; I don't see any obvious cracks in the coil housing. I was about to take it back to the dealer, but they couldn't get me in this week because of the holiday.

Question: what is the "famous Subaru hesitation"? I've seen references to it in other forums too, and it seems to be a common problem, but I've never found a good description of what it is. Can anybody take a moment to clue me in?

Thanks,
Dan Crank
St. Louis, MO
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Old 11-23-2000, 08:39 AM   #11
SSLegacyGT
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2006 Legacy 2.5i
Wagon, 5MT, Blue

Post

Hey Danno, run a search onknock sensors under the powertrain forum, you'll get a bunch of posts explaing the famous hesitation. It has to do with the ECU overreacting to information sent byt the knock sensor, thus retarding power to the engine. I had to read up on it myself, had I known about this problem before I bought the car i don't think I would have bought it!!!
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Old 11-23-2000, 09:05 AM   #12
Gambit
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If it's hesitations, and if you haven't change your fuel filter for a long while, try doing that first. The filter only cost me CDN 29 bux and it's very easy to change.
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Old 11-23-2000, 10:25 AM   #13
Danno
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2002 WRX Sedan
Mithril

Post

The light bulb just came on! Guess what vital engine fluid just got changed last week! I found Gary's page and will be writing him a check within moments. I'll also try the computer reset.

Thanks guys! I wish I'd found this board long ago.

Dan
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