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  1. #1
    Join Date
    Jan 2012
    Location
    Atlanta, GA
    Posts
    267

    Default Backfire, Now A Lot Louder At Full Throttle.

    So, hey! Curious thing happened tonight coming home from work- I came to a nice, remote, twisty back road, and decided to punch it a bit. Next thing I know, there's a loud BANG (backfire?) and a jolt. Terrified, I slow it down to idle. No messages, no warning lights. Cautiously, I accelerate normally. Everything seems completely normal, until I press the accelerator a bit harder. LOUD! The engine is a LOT louder at full throttle, not only from the tailpipe, but also under the hood. She came with an already nice sounding MTE exhaust, but now it sounds like a hot rod. Pretty crazy!
    Any ideas?
    just installed a Snabb Fresh Air Turbo Intake, new vac hoses, new Phuzzy HD TCV two weeks ago. That's all that has changed recently, and I've been thoroughly enjoying it!
    Guy Welch
    2004 XC70 90K miles
    Ash Gold Metallic/Oak
    English Shepherd option installed in rear.

  2. #2
    Join Date
    Feb 2010
    Location
    Virginia Beach
    Posts
    3,854

    Default

    Sounds like you've got a cracked manifold or downpipe...need to put it up and take a look...
    Current Fleet:
    2016 Tundra Crewmax 4WD 1794
    2005 MB S600 (100K, Michelin AS3+, M1 0W40)
    2002 V70-XC (238K, Castrol Edge 0W40)
    2002 V70-T5 (195K, IPD bars, Bilsteins)
    2001 V70-T5 (76K)
    1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)

  3. #3
    Join Date
    Jan 2012
    Location
    Atlanta, GA
    Posts
    267

    Default

    Gah! I was afraid of that! We will see.
    Guy Welch
    2004 XC70 90K miles
    Ash Gold Metallic/Oak
    English Shepherd option installed in rear.

  4. #4
    Join Date
    Apr 2003
    Location
    Devon PA
    Posts
    11,409

    Default

    Should not backfire at all.
    The only Volvos that backfired were 2004 Rs
    All emails please use: jrl1194 (at) aol.com

    2007 V70 2.5T White/Oak, 112K miles. My daily driver and GORGEOUS
    2000 V70R wife's. Won't sell, now at 148K miles !! and still (almost) perfect.
    2000 S70 GLT SE with 29,000 miles!!! A time capsule, V70R front bumper, Volans, etc. SOLD!!! (I Will regret selling this!)

  5. #5
    Join Date
    Jan 2012
    Location
    Atlanta, GA
    Posts
    267

    Default

    Yeah, now thinking back to the event, it was more of a metallic "Pop" (kind of a "PUNGGG!" sound) with sudden jerk. I drove it to work this morning- It kept stalling when the idle tried to kick down while warming up. Three tries later, it started and maintained the "warmed up" idle. Ran fine, but opening the throttle sounds like a muscle car under the hood. Wayyy diminished turbo performance (full throttle only produces 2-3 psi of boost on my ipd gauge as opposed to the typical 18-19 psi), which makes me believe it's definitely a cracked exhaust manifold (before the turbocharger).

    Going under the car to check it out after work.

    If it is the manifold, any recommendations for a good part source? Saw a used one on eBay for $99.
    Guy Welch
    2004 XC70 90K miles
    Ash Gold Metallic/Oak
    English Shepherd option installed in rear.

  6. #6
    Join Date
    Dec 2002
    Location
    TPE>BNE>DFW>AUS>TPE
    Posts
    1,463

    Default

    Sounds like you may have just popped the charged air pipe from turbo to intercooler, or intercooler to ETM.
    Our exhaust manifold is pretty tough, doubt it is that.
    Good luck and keep us posted.
    2002 V70XC w/volvoXC.com stickers! MTE Stage 3+

  7. #7
    Join Date
    Feb 2010
    Location
    Virginia Beach
    Posts
    3,854

    Default

    forgot about that charge air pipe...easy check, easy repair...
    Current Fleet:
    2016 Tundra Crewmax 4WD 1794
    2005 MB S600 (100K, Michelin AS3+, M1 0W40)
    2002 V70-XC (238K, Castrol Edge 0W40)
    2002 V70-T5 (195K, IPD bars, Bilsteins)
    2001 V70-T5 (76K)
    1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)

  8. #8
    Join Date
    Jan 2012
    Location
    Atlanta, GA
    Posts
    267

    Default

    Thanks for all the optimism guys- nope, the charge air pipe -and all the pipes are tight. Gotta have my coffee, then we're gonna get into it!
    Guy Welch
    2004 XC70 90K miles
    Ash Gold Metallic/Oak
    English Shepherd option installed in rear.

  9. #9
    Join Date
    Feb 2010
    Location
    Virginia Beach
    Posts
    3,854

    Default

    Your car is running like mine did after the turbo fried itself (this was 13 years ago, a 245 turbo wagon). Ended up needing a new turbo...

    If you need a new turbo - I would go with Erie Vovo and get good used one ($275) : http://www.ebay.com/itm/Volvo-OEM-2-...item519d941824

    If the manifold is damaged as well, I would get an R manifold. Bought one recently (Erie Vovo eBay store) for $197.00...they have another: http://www.ebay.com/itm/Volvo-R-Exha...item35c00102aa
    Current Fleet:
    2016 Tundra Crewmax 4WD 1794
    2005 MB S600 (100K, Michelin AS3+, M1 0W40)
    2002 V70-XC (238K, Castrol Edge 0W40)
    2002 V70-T5 (195K, IPD bars, Bilsteins)
    2001 V70-T5 (76K)
    1932 Packard Sedan (straight 8, dual sidemounts, original paint and interior, Shell Rotella 15W40)

  10. #10
    Join Date
    Jan 2012
    Location
    Atlanta, GA
    Posts
    267

    Default

    And the verdict is (drumroll please!); cold air intake to throttle body pipe came loose!!!
    It was hard to see in the early morning light (pre-coffee) with my lovely assistant still sawing logs and not available for revving.
    All is back to normal.
    Astro- funny you should mention it, I already had inquired with Erie as to whether or not that R manifold was a direct fit, as I saw they had 4 available. So yes! Maybe in the future. Do you notice a performance boost?

    New question: Having just acquired this car in January,with not much to go off of for past maintenance history other than lucking into the same dealer that maintained it for the previous owner, is there an easy way to tell if there is a tune on the car? My IPD boost gauge regularly reads 18-19 psi (I thought stock max was around 8 psi) when I push it, like when I blew the pipe off! It came with a "hot rod" TME/IPD exhaust system, so there is evidence of "Modding". Would you be able to tell with a Dice/Vida scan?
    Guy Welch
    2004 XC70 90K miles
    Ash Gold Metallic/Oak
    English Shepherd option installed in rear.

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