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Old 05-01-2001, 03:04 PM   #1
Gadget6
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Member#: 6239
Join Date: May 2001
Location: Bellevue, WA
Vehicle:
00 2.5 RS sedan
Silverthorn

Question Backfiring on MY00 2.5RS w/ MT

Has anyone experienced a moderate backfire at the shift point between 1-2 and 2-3 gears? My 2000 2.5RS sedan has done this off and on since new. Frequency of the problem seems to be increasing with age and is more apparent when the engine has warmed up. Dealerships have diagnosed the problem as being everything from "normal for the 2.5 engine" to bad gas and/ or aggressive driving. I have been told repeatedly that the computer diagnostic reads that the engine is operating normally. Any suggestions?
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Old 05-01-2001, 03:57 PM   #2
Jaxx
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Location: Boise,Idaho,USA
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The 93 Imp W/EJ20K
flat black

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do you have an after market exaust?

mine does it too but its not stock.. and i like it
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Old 05-01-2001, 04:02 PM   #3
S.Damery
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Unequal length headers
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Old 05-01-2001, 04:13 PM   #4
Gadget6
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Location: Bellevue, WA
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00 2.5 RS sedan
Silverthorn

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Engine and exhaust are completely stock. I have been reluctant to modify anything for fear that the dealer would blame the problem on the mods.
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Old 05-01-2001, 05:06 PM   #5
dandbest
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Location: Bayside, NY
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My car has been doing this from day one. I now have a cat back exaust and Larrys intake, and it still does it... It has been back to the dealer at least three times, but for whatever reason, they can never get it to happen (which I think is bs cause it happens to me every day) and they never fix it. I am going to change all the gaskets in the exaust from the engine all the way back in the next few weeks, so I'll let everyone know if it works.

Danny
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Old 05-01-2001, 06:58 PM   #6
Midwayman
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If it is a popping sound and not a loud crack like gunfire you're just getting a completely normal scooby sound. Its excess gas hitting the cat.
-B
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Old 05-01-2001, 08:28 PM   #7
Penphoe
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00 Impreza RS GM6 RIP

Thumbs up

Man, I love that popping and burbling sound that comes out of the RS! I never had it with my stock exhaust, but it occasionally happens with my Stromung. It's more pronounced during start-up and when the engine is cold. I believe this is due to the fact that the ECU is running the engine a bit richer to help warm things up.

If you're getting a loud "bang" backfire-type sound, then something indeed is wrong. If you're getting the occasional "pop" or two when driving and the engine is not warmed up yet, it's perfectly normal. I notice this happens if I shift around 3-3.5k.

LaterZ!
Darren!!
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Old 05-02-2001, 08:21 AM   #8
trojan9x
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i get it to happen if i am coasting in gear then lightly tap on the gas. makes a nice pop, doesn't sound like it's harming anything, but i thought it might of been the gaskets too..changed them and still the same. i think it's the same as it was stock, just more pronounced with the aftermarket exaust.
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Old 05-02-2001, 09:32 AM   #9
Iron Man
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2001 RS coupe
silver/custom

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i have the scoobysport exhaust system, and i was told before i installed it that i would get a pop or backfire type noise when driving. i soon found out it only happens around 3k rpm......

whats with that? am i running too rich? not enough oxygen? what?
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Old 05-02-2001, 10:11 AM   #10
Gadget6
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Vehicle:
00 2.5 RS sedan
Silverthorn

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Thanks for the feedback. The "backfire" ranges from a slight puff to a pronounced pop that now occurs with enough regularity that passengers comment on it. I can also get it to happen when I let off the accelerator abruptly at higher RPMs. I have never owned a Subaru before but have spoken to many owners (Impreza and Legacy w/ 2.5) who have not experienced this problem (or at least not noticed it). If it is normal and if it is caused by unburnt fuel hitting the CAT, won't that cause early failure of the CAT? Also, why would the frequency increase with age?
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Old 05-02-2001, 10:56 AM   #11
Midwayman
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*shrug*
Its normal is all I can say. Mine does exactly what you said. Its always there, just not as noticable unless you have a aftermarket muffler. (BTW Ive heard mufflers do tend to get louder with age)
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