Mine's done it since day one also with the stock exhaust (but very muffled)
... I just thought there might be a trick to stop it.
Any other 4.7's have it?
-- Canuck -------------------------------------------- Y2K, 4.7L, 2wd, 5spd, The Ultimate K&N HomeBrew, Flowmaster CatBack http://www.twistedbits.net/WWWProfile/dakota/Vyikam1jjgNN6<Y1topbanana73@netscape.net> wrote in message news:0DBACAFC.3074B26D.F15A0834@netscape.net... > > My 98 5.2L 5-spd has done the 'gurgling' you speak of since day one, even w/ the STOCK exhaust. It's more pronounced now w/ my Gibson system, but you just get used to it after a while. Not much that you can do as far as I know. > > Bill M > 98 CC Sport, 5.2L, 5-spd, 3.55 SG > > ----------------------------------------------------- > - -----Original Message----- > From: Canucker Trucker [mailto:mal5@ualberta.net] > Sent: Thursday, July 25, 2002 8:05 AM > To: dakota-truck-moderator@bent.twistedbits.net > 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. > > > > __________________________________________________________________ > Your favorite stores, helpful shopping tools and great gift ideas. Experience the convenience of buying online with Shop@Netscape! http://shopnow.netscape.com/ > > Get your own FREE, personal Netscape Mail account today at http://webmail.netscape.com/ >
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