Horrible BOG!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

keiths69swb · 01-04-2008, 07:28 PM

I have a 1971 short wide that has developed a horrible bog. It runs fine down the highway but if you try to lay rubber it bogs and dies. If you let up on the throttle a little it begins to clear and slowly builds RPM but I don't have any other idea what it could be. I changed carbs, plugs, wires, distributer cap and rotor. It idles fine and starts very easy, but it runs like crap if you hit the gas with any sense of urgency. This problem came from nowhere. SOME PLEASE HELP!!!

bowtieboy93 · 01-04-2008, 08:32 PM

we had a '94 suburban with the EXACT same prob we changed map sensors and everything but it turned out to be the $8 fuel filter so u may wanna try that

57sailplane · 01-04-2008, 08:44 PM

i would say fuel pump or filter. you say you switched carbs so that counts out the accelerator pump. it could also be slipped timing chain.

69TowRig · 01-04-2008, 08:46 PM

Vote #3 for the fuel filter. Had this happen to my first truck when I was 16 and had no clue...

70' GMC · 01-05-2008, 01:42 AM

what would be a good fuel filter. My truck has an inline fuel filter and mine has been doing that here lately.

68Stepbed · 01-05-2008, 03:56 AM

Whatever fuel filter you get, don't get the cheap glass see through filters. If you have a Q-jet, just get a stock filter. I like the fat metal filters with the seam in the middle of them. Auto Zone has chrome ones. If you don't see it, then just go to the filter section and find a universal fit filter.

heavy70 · 01-05-2008, 06:56 PM

personally I think it is the driver!!!!LOL

hdflstf · 01-05-2008, 07:36 PM

Check your ignition timing, make sure both the vacuum advance and mechanical advance are working and the right amount. Lake a look at vacuum lines to make sure yo have no leaks or disconnected hoses.

**WorkinLonghorn** · 01-05-2008, 07:43 PM

There's also the sock on the fuel pick-up in the tank that gets clogged with rust and crud. Check that and any rubber connections on the fuel line that have gotten old and collapse with the suction crated by the fuel pump ahead.

greasemonkey · 01-05-2008, 08:25 PM

Make sure fuel tank is venting properly as well and not creating a vacuum inside.

Premium72 · 01-06-2008, 03:48 AM

yeah i agree you got a fuel dilevery problem. check from tank to engine, see where its getn hung up..

BB72CHEVKT · 01-06-2008, 05:09 AM

if my truck had a horrible BOG aka "big ol girl" in it it would probably run like crap too! j/k

68Stepbed · 01-06-2008, 09:54 AM

^ Dude, that ain't even right.

OrangeCrush1970 · 01-06-2008, 10:19 AM

I just laughed out loud!!!!

Possibly a bad signon unit in the tank. I agree this sounds like a fuel delivery issue.

keiths69swb · 01-06-2008, 02:52 PM

I bought a couple of filters today and will see what I can find out this weekend. Oh and I don't think my right foot could malfunction that bad!!! LOL...

keiths69swb · 01-09-2008, 01:35 PM

Well, I changed the fuel filter, which was very ditry I might add, and tried it again, no luck. I checked to make sure that the vaccum advance was working and it does, no leakes in any of the hoses. I drove the truck with the gas cap off to see if it was pulling a vaccum on the fuel tank, not it either. The only thing I haven't tried is to reset the timing. I don't have a timing light so I'll have to wait until I can get one.

01-04-2008, 07:28 PM	#1
keiths69swb Registered User Join Date: Aug 2007 Location: Shawnee, Oklahoma Posts: 28	Horrible BOG!!! I have a 1971 short wide that has developed a horrible bog. It runs fine down the highway but if you try to lay rubber it bogs and dies. If you let up on the throttle a little it begins to clear and slowly builds RPM but I don't have any other idea what it could be. I changed carbs, plugs, wires, distributer cap and rotor. It idles fine and starts very easy, but it runs like crap if you hit the gas with any sense of urgency. This problem came from nowhere. SOME PLEASE HELP!!!

01-04-2008, 08:32 PM	#2
bowtieboy93 Registered User Join Date: Feb 2007 Location: (Cloverdale) Surrey BC Canada Posts: 1,566	Re: Horrible BOG!!! we had a '94 suburban with the EXACT same prob we changed map sensors and everything but it turned out to be the $8 fuel filter so u may wanna try that __________________ Travis travis_moffatt@hotmail.com 1969 Chevrolet C-10 LWB, 350c.i., TH350, In Pieces. 1991 GMC Sonoma, IROCS s10 grill 1963 Ford Galaxie 351/C4

01-04-2008, 08:46 PM	#4
69TowRig Senior Member Join Date: Jan 2005 Location: Raleigh, NC Posts: 894	Re: Horrible BOG!!! Vote #3 for the fuel filter. Had this happen to my first truck when I was 16 and had no clue... __________________ -Chris Building a stripper, one part at a time: 1969 K5, 307, 3spd, 3 seats, hard top. Added Pwr Discs, Pwr Steering, Aux Battery, T-case Skid, Lighted Sidemarkers, HEI, Lock-Right Diff, ECE Class IV Hitch, 32" MT/Rs. Parts to Install: Hand Throttle, Console, Tow Hooks, Dual Horns, AM-FM, Dealer Swing-Away Tire Carrier, Gas Tank Skid. Also building a 1950 Willys CJ-3A and off-roading a 2001 Nissan Frontier on 1-Ton Portals...

01-05-2008, 01:42 AM	#5
70' GMC HERE.......Somewhere Join Date: Oct 2006 Location: Birmingham AL Posts: 2,488	Re: Horrible BOG!!! what would be a good fuel filter. My truck has an inline fuel filter and mine has been doing that here lately. __________________ Current rides: 2013 Hyundai elantra gt DD 1995 camaro my first crush lmao Was: 1970 with a 350 4barrel and 288 horses Classics make it possible!

01-05-2008, 03:56 AM	#6
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Re: Horrible BOG!!! Whatever fuel filter you get, don't get the cheap glass see through filters. If you have a Q-jet, just get a stock filter. I like the fat metal filters with the seam in the middle of them. Auto Zone has chrome ones. If you don't see it, then just go to the filter section and find a universal fit filter. __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system

01-04-2008, 08:44 PM	#3
57sailplane Senior Member Join Date: Mar 2004 Location: Nebraska Posts: 583	Re: Horrible BOG!!! i would say fuel pump or filter. you say you switched carbs so that counts out the accelerator pump. it could also be slipped timing chain.

01-05-2008, 06:56 PM	#7
heavy70 Registered User Join Date: Dec 2007 Location: choctaw, oklahoma Posts: 100	Re: Horrible BOG!!! personally I think it is the driver!!!!LOL

01-05-2008, 07:36 PM	#8
hdflstf Registered User Join Date: Oct 2007 Location: Desert Southwest Posts: 540	Re: Horrible BOG!!! Check your ignition timing, make sure both the vacuum advance and mechanical advance are working and the right amount. Lake a look at vacuum lines to make sure yo have no leaks or disconnected hoses.

01-05-2008, 07:43 PM	#9
WorkinLonghorn Senior Member Join Date: Dec 2006 Location: Studio City, Calif. Posts: 2,861	Re: Horrible BOG!!! There's also the sock on the fuel pick-up in the tank that gets clogged with rust and crud. Check that and any rubber connections on the fuel line that have gotten old and collapse with the suction crated by the fuel pump ahead. __________________ '69 GMC C2500 Custom Camper, 8 1/2' bed, New GM 350, NP 435 Close Ratio 4spd. Trans., 3.73 Dana-60 open.Camper and Trailer wiring, PS, PB, AC, tach , three gas tanks, 2nd owner, Work-Truck supreme. Best $300 I ever spent.

01-05-2008, 08:25 PM	#10
greasemonkey Registered User Join Date: Dec 2001 Location: Pace, FL Posts: 2,155	Re: Horrible BOG!!! Make sure fuel tank is venting properly as well and not creating a vacuum inside. __________________ 1942 Master Deluxe 1969 C/10 1985 Blazer CUCV 1987 Jimmy 2004 Tahoe 2005 Silverado 1500 2005 Silverado 3500

01-06-2008, 03:48 AM	#11
Premium72 Registered User Join Date: Sep 2005 Location: Villa Rica Ga Posts: 889	Re: Horrible BOG!!! yeah i agree you got a fuel dilevery problem. check from tank to engine, see where its getn hung up.. __________________ WombatFire, Art-Design-MADNESS Follow My Build and Adventures on Instagram

01-06-2008, 05:09 AM	#12
BB72CHEVKT Junior Member Join Date: Mar 2007 Location: Hideaway, TX Posts: 4,950	Re: Horrible BOG!!! if my truck had a horrible BOG aka "big ol girl" in it it would probably run like crap too! j/k __________________ 71 Suburban 350/700R4 Project Trixie 72 CHEVY,Highlander,SWB,396,T400 Last edited by BB72CHEVKT; 01-06-2008 at 09:58 AM.

01-06-2008, 09:54 AM	#13
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Re: Horrible BOG!!! ^ Dude, that ain't even right. __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system

01-06-2008, 10:19 AM	#14
OrangeCrush1970 Registered User Join Date: Jun 2007 Location: Smyrna, GA Posts: 709	Re: Horrible BOG!!! I just laughed out loud!!!! Possibly a bad signon unit in the tank. I agree this sounds like a fuel delivery issue. __________________ *Rottenwood Garage* 1970...71...72 C1500 aka Orange aka Sideshow Bob 540 BB Straub Roller Cam, AFR Magnums, XP 950, TKO 600 2 Tons of Fun

01-06-2008, 02:52 PM	#15
keiths69swb Registered User Join Date: Aug 2007 Location: Shawnee, Oklahoma Posts: 28	Re: Horrible BOG!!! I bought a couple of filters today and will see what I can find out this weekend. Oh and I don't think my right foot could malfunction that bad!!! LOL...



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01-09-2008, 01:35 PM	#16
keiths69swb Registered User Join Date: Aug 2007 Location: Shawnee, Oklahoma Posts: 28	Re: Horrible BOG!!! Well, I changed the fuel filter, which was very ditry I might add, and tried it again, no luck. I checked to make sure that the vaccum advance was working and it does, no leakes in any of the hoses. I drove the truck with the gas cap off to see if it was pulling a vaccum on the fuel tank, not it either. The only thing I haven't tried is to reset the timing. I don't have a timing light so I'll have to wait until I can get one.

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