Not just the 4.7's. Most all that I know of. Since this EFI and OBD-II
most engines run pretty lean so when you let off all that heat does ignite
whatever's left.
Ron
00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
For modifications see my DML Profile (URL follows)
http://www.twistedbits.net/WWWProfile/dakota/Kw9pV1EkFeOYY
-----Original Message-----
From: owner-dakota-truck@dakota-truck.net
[mailto:owner-dakota-truck@dakota-truck.net]On Behalf Of Canucker
Trucker
Sent: Thursday, July 25, 2002 12:51 PM
To: dakota-truck-moderator@bent.twistedbits.net
Subject: DML: Re: Cat Back 'back firing'
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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