Bogging out

[BLAZINV8s10]

Engine runs great in park, and at idle in gear. As soon as I give it gas it bogs down and sounds like it is going to shut off. I have checked the distributor and everything is fine. Does this sound like carb or trans problem, I think trans problem, but what? I have a TH350 and the detent cable is hooked up and the vacuum line is hooked up, retained the column shifter. Thanks for all the help from everyone! http://www.s10v8.com/images/smilies/icon_biggrin.gif

[Mike]

sounds like a carb problem, power valve?

[IceQueen]

what fuel pump you using? sounds like power valve or not enough gas so it leans out.

[s15laynrubba]

What carb are you using?

[wild85]

If you are using a holley carb it may be that you need a bigger accelerator pump which gives the engine an extra shot of gas so there is no bogging from lack of gas. I have the same problem with mine, but don\'t have time to fix it yet.

[BLAZINV8s10]

I have the \"quadra-puke\" and I am using the stock mechanical fuel pump, worked great for awhile then it started doing it all the time. At about 45-55 mph it also cuts in and out almost like its shifting back and forth between gears but the r\'s are not sky rocketing, it bogs instead.

[IceQueen]

sounds like a vacuum leak to me. BTW the q-jets are very decent carbs they support a wide power band and give you 750Cfm for a carb just because its more complicated then a holley or edelbrock carb doesn\'t me it is any less powerfull it just needs to be setup correctlyt and Im sorry to say what ever problems you get now can be had with just about any carb my friend.



use a propane torch or ether and go around all your va* connections including the manifold were the carb is bolted down. its also possible that you obver tightened the bolt holding the carb down that is next to the bowl which will cause a leak there.

[BLAZINV8s10]

Yes I know that q-jets are great for cfm, but I just hate to rebuild them and work on them. What will this torch or ether do, I dont want the torch lite right?

[xeniadrums]

\"45-55 mph it also cuts in and out almost like its shifting back and forth between gears but the r\'s are not sky rocketing, it bogs instead.\"



also check the fuel filter inside of the carb for clogging. When I ran my q-jet I had this problem. When I put a new one in, worked fine.. until the floats stuck.. http://www.s10v8.com/images/smilies/icon_smile.gif

[IceQueen]

yeah check the filter aswell and you want the torch to not be lit its see a va* causes the engine to run lean so it bogs if there is a leak the engine will rev higher because it will draw in the gas through the va* leak and burn it..

[speeder]

sounds like not enough fuel. I think that the fuel pump, or the filter, is the cuplrate.

[sorj]

make sure your input pressure is 5 to 7 minimum. also did you remove the pump inside the tank? if so, did you notice the plumbing diameter? most of the sending units that I have come accross are either 1/4\" or 5/16\". you may have to replumb.also depending on the q-jet, make sure the metering jets are working correctly and that the carb is not full of carbon from your donor vehicle. you can verify the jets working by using a small screwdriver thru the top of the carb.also don\'t forget that q-jets are known for their internal leaks- make sure the plugs are plasti-welded over and fully sealed. but don\'t forget to check your timing, if you are using an old harmonic balancer, it may be spun causing a false reading when checking your timing. hope this helps, sorj

[sorj]

the more I think about it ,I think minimum pressure is 7 to 9 psi. while running. sorj

[hr2impeach]

check for a vacuum leak at the base plate around the butterfly rod or what you call it, i am drawing a blank. i have a bunch of them with that problem, makes it a pain to set timing and to adjust the carb. just a guess

[speeder]

I have thought about it some more. it sounds like not enough gas, IMO. Just visually check the carb, when giving it gas. If there is no shot of gas flowing, concurrent with the lever moving, then you even know which bank is messed up.

[sorj]

I guess we still need just a little more information, what is your fuel pressure at the inlet of the carb. while running at idle? this is critical to try to help you with your problem along with what is your vaccuum reading at idle and holding at at steady rpm of approx 1500-1700 rpm? does the reading start dropping after a good few seconds indicating a partially plugged cat? is your fuel pump the original in tank unit? if you don\'t have the right regulator that allows it to have constant flow (meaning you are not using the return line but only the pressure line),you are overheating the fuel pump causing it to fail when the truck needs it the most.

[BLAZINV8s10]

Thanks all, I replaced it with an Edelbrock and Performer RPM manifold. Runs great although I still need to hook up the kickdown and vac line for the tranny, manually shifting for now.

[cashone]

I have the same problem with bogging out, I got a 850 demon carb, and some days it runs GREAT, and others it runs like sh*t?? maybe too big of a carb?? or even water in the gas?? help with answers!! thanx