My 4.2L with FM 40 duals would gurgle, while my 4.6L wouldn't, unless I stomped the gas and let off in nuetral. Now that I have 3" mufflerless catback turn-down...it rarely gurgles / pops. To tell the truth, I kinda like the popping. What causes it?

-AR

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2001 F-150 XLT 4x4 Off-Road, SuperCab, Flareside, Black[*] 4.6L Triton V8 HPI[*] 5 Speed / 3:55 Reg. Axle[*] Keyless[*] Premium Audio CD

Mods:[*] K&N Cold Airbox / Throttle Body Mod.[*] 3" Cat-Back (No Muffler, Turn-Down)[*] Cranked Torsion Bars[*] APC XENON PLASMA Super Whites[*] Bugshield[*] Bedliner[*] Ventshades[*] Taillight Covers (Slotted)[*] Removed Mudflaps[*] "Light Argent" 4x4 Off-Road Decals[*] K&N & Flowmaster Stickers (Under the Hood)

Audio:[*] Clarion 6675[*] Rockford Fosgate 5x7's[*] Rockford Fosgate G360A2 Punch Amp[*] JL 12W3-D2 (Ported)[*]Viper 500 Alarm

Build Date: 8/23/00 (Kansas City Plant)

arobbins@mail.liberty.k12.mo.us

 

I believe the popping or gurgling is unburnt gas exploding in the exhaust, which is why you hear it after you let off it from punching it. The gas was fed at a large amount, then all of a sudden not, but there is still fuel in the cylinder that is exhausted out and fires in the pipes, after the fact.

I'm sure if I'm wrong, I'll hear about it.

Back in Ohio, we called it "cackling". Setting the wayback machine to 1981, in high school, my slant 6 Valiant would cackle good. My dad tuned the carb rich to improve performance, decrease gas mileage, with the end result being a good cackle out the glasspack.

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The GO 4D IT SuperCrew '01 SuperCrew XLT 4x2 (Generation II): 5.4L, Limited Slip, Black, 5-Spoke Rims, Dark Cloth, Capt. Chairs, Power Seat, Steps, Extender, Moonroof; Ford/Duraliner, K&N drop-in filter, Ford molded rear mudflaps, Tinted front windows.

(for sale) The GO 4D IT Ranger: '93 Ranger XLT SuperCab 4x2: 65K miles; 4.0L; Limited Slip; Black; Alum. Rims; A.C.; Power windows, mirrors, and locks; CD Player; Hard Tonneau; Running Boards.


If it weren't for trucks, we wouldn't have tailgates.

 

Here in the panhandle of Florida we call this phenomenon "Talking Back". As in listen to her "talk back" when I get on it.

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Thanks.
- Jay

 

ROFLMAO!!!

-AR

 

"Talk Back" is great!

I've heard the word "cackle" used to describe what a bunch of hens do. "Cackle like a bunch of hens" also describes a group of women lively discussing something.

 

i have had this since my cat back was put on the truck. i had no idea what it was.

i checked the pipe to make sure it was not hitting the spare, or right rear shock and everything looked fine.

i feel better now knowing that this is a 'normal' situation with the install. i have been listening more for it now since reading the post, and it is always after i back off from harder acceleration.

thanks for the info.

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mr k
_ ____________________ _
1999 f150 xlt ex-cab 4x4
4.6 triton v8
5 speed manual
3:55 rear
towing package
k&n f.i.p.k.
gibson ss swept side

 

I believe it is the timing. When you let off the gas the timing hasn't retarded yet so it is firing later. That's my thought.

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1997 XLT Teal 4.6L Flareside 4x4 ORP. Automatic, Reg. cab, 3.55LS, tinted windows, bug deflector, Dual exhaust, K&N Generation 2 air filter, BullDog keyless entry/remote start, Modern 16" wheels, bedliner, Covercraft tonneau cover, White faced gauges, electronic shift on the fly, Clarion ADX5655z Double Din Cassette & CD, 4 Pioneer TS-A6865 speakers and superchip. Going to add headers.


Future mods: Supercharger, headers, NOS, tranny upgrade(heavy duty gears, clutch packs, etc.), performance torque converter, bore engine 30 over, new pistons, crank, and rods, and performance heads.




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