Canuck-
Sounds like your Dakota may be running a little lean, my Charger
used to do the same thing with the THRUSH mufflers it had. I had to rejet to
richen things up, but it still did it just not quite so loudly. I am not
sure what the fix will be on your '00 4.7 as they are EFI and my Charger had
a HOLLEY carb.
Ron- '01 Dakota Sport 3.9 Supercharged
website: www.scsilverdak.com
e-mail: scsilverdak@hotmail.com
----- Original Message -----
From: "Canucker Trucker" <mal5@ualberta.net>
To: <dakota-truck-moderator@bent.twistedbits.net>
Sent: Thursday, July 25, 2002 11:05 AM
Subject: DML: Cat Back 'back firing'
>
> Well I installed my 40 series flowmaster single in dual out cat back on my
> 4.7L last night. I love the sound (whoever said 40 series is too loud, is
> just too old!) but when down shifting or letting off the throttle around
> 2000 RPM there's that annoying gurgling and backfiring sound.
>
> Has anyone else had this problem? Is there a fix for it?
>
> I had it on my '88 Mustang 5.0L and fixed it by removing the air pump
(pumps
> ambient air into the exhaust to 'lower' emissions ... what was happening
> there was the fresh air was burning with the unburnt fuel in the exhaust
> pipe ... remove the air and there's no more burning).
>
> Anyone? Please help, cause I hate that sound! I think what it might be
> doing is actually sucking air back into the pipe when I let off the
> throttle.
>
>
> thx.
>
> --
> Canuck
> --------------------------------------------
> Y2K 4.7L 2wd 5spd
> http://www.twistedbits.net/WWWProfile/dakota/Vyikam1jjgNN6
>
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