Stalling/Bogging down on acceleration
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Stalling/Bogging down on acceleration
Hey everyone,
I did some thorough searching and I also read the carburetor's owner's manual before posting.
I have a 1986 F250 Supercab Longbed with the 351W and the C6 transmission.
The carburetor is an Edelbrock 1406. When I'm driving at higher speeds (45+ mph) and I begin to climb a grade (especially a steep one), the 351 begins to cough and sputter. Applying more throttle makes the problem even worse. At some points it gets so bad that after I pull off the the side of the road the truck just dies. I'll pump the gas a few times, start the truck, and then she's good to go - until the next steep grade.
At slow speeds there's no trouble to speak of. I'll climb a steep grade under 3/4 throttle at slow speeds and have no issues - in fact, she pulls really strong!
I'm confused and have no idea what I'm doing here. Can someone help me out?
Thanks,
~oz
I did some thorough searching and I also read the carburetor's owner's manual before posting.
I have a 1986 F250 Supercab Longbed with the 351W and the C6 transmission.
The carburetor is an Edelbrock 1406. When I'm driving at higher speeds (45+ mph) and I begin to climb a grade (especially a steep one), the 351 begins to cough and sputter. Applying more throttle makes the problem even worse. At some points it gets so bad that after I pull off the the side of the road the truck just dies. I'll pump the gas a few times, start the truck, and then she's good to go - until the next steep grade.
At slow speeds there's no trouble to speak of. I'll climb a steep grade under 3/4 throttle at slow speeds and have no issues - in fact, she pulls really strong!
I'm confused and have no idea what I'm doing here. Can someone help me out?
Thanks,
~oz
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I was perusing Google and someone in another forum was having problem with their Toyota 22R motor, symptoms sounded a lot like mine. One of the suggestions was the fuel pump - could it be time for a new fuel pump on mine?
Also, would it be a good idea to install an electric fuel pump on my truck since she's carbureted?
Also, would it be a good idea to install an electric fuel pump on my truck since she's carbureted?
Last edited by ozyran; Dec 17, 2007 at 03:34 PM.
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I haven't run the truck out on the highway with the new filter element yet, but she seems to be running a bit better. I'm thinking I might drop the cash on another fuel pump anyways, I imagine the one installed on the truck now is getting a little tired.
I think it might also be time for a carburetor rebuild, too.
I think it might also be time for a carburetor rebuild, too.
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i had the same problem with my truck. check both float levels, and then check the accelerator pump circuit.....you might need to get a different size squirter, or a different profile for the pump cam.
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Update - truck still seems to be bogging down, I'm thinking now it's more along the lines of what ff86f150 said - squirter/pump cam profile.
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Don't know if it's the same as what I had, mine would spit and sputter under a load {going uphill} was fine on straights....I changed the plugs and wires...been running great since. My brother is a mech. he was saying usually thats a sign of a foul in the spark {spitting and sptter under load}
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No, I don't think that's what it is - although I haven't changed the wires yet.
Also, when the engine is still warming up, I can lay the hammer down and the 351 will roar - and I mean ROAR! However, once she's warmed up and I've been on the highway for a while, she acts like she's starved for fuel sometimes.
Also, when the engine is still warming up, I can lay the hammer down and the 351 will roar - and I mean ROAR! However, once she's warmed up and I've been on the highway for a while, she acts like she's starved for fuel sometimes.
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From: Niceville, FL.
ozyran,
A few questions: 1. Has it done this since the Edlebrock was first installed? 2. Do you get any pinging under load? 3. When it runs really well while it's cold, is the choke still partially closed? 4. Is the distributor vacuum advance hooked up and working properly? 5. Does it idle well? If so, is the curb idle speed adjustment screw holding the throttle plates open a significant amount to obtain the proper idle? 6. Are the carburetor floats adjusted to produce the proper fuel level? Your carb manual should provide instructions on how to measure & adjust. 7. Are the secondary throttle plates opening under load when the vacuum drops?
A few questions: 1. Has it done this since the Edlebrock was first installed? 2. Do you get any pinging under load? 3. When it runs really well while it's cold, is the choke still partially closed? 4. Is the distributor vacuum advance hooked up and working properly? 5. Does it idle well? If so, is the curb idle speed adjustment screw holding the throttle plates open a significant amount to obtain the proper idle? 6. Are the carburetor floats adjusted to produce the proper fuel level? Your carb manual should provide instructions on how to measure & adjust. 7. Are the secondary throttle plates opening under load when the vacuum drops?
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I'm gonna have to check that laundry list of questions on my truck; thank you, it gives me a definitive starting point. The previous owner jacked up the vacuum lines and capped lines like crazy, so only a few lines are even hooked up!
Stupid question:
My truck has an AIR pump but no catalyst. Is it emissions controlled or not?
(The emissions sticker says NON-CATALYST right on it)
Stupid question:
My truck has an AIR pump but no catalyst. Is it emissions controlled or not?
(The emissions sticker says NON-CATALYST right on it)
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From: Niceville, FL.
During this era trucks with GVWR over 8500 lbs. were exempt from using catalysts but still required some emissions equipment such as an air pump (some had two), retarded camshaft timing,
PCV valve, vacuum advance rate restrictor, EGR valve, throttle kicker, charcoal cannister(s), et.al. The actual number and types of emission items apparently depended on vehicle being built to Federal, California or Canadian standards as well as GVWR and which engine was installed.
PCV valve, vacuum advance rate restrictor, EGR valve, throttle kicker, charcoal cannister(s), et.al. The actual number and types of emission items apparently depended on vehicle being built to Federal, California or Canadian standards as well as GVWR and which engine was installed.
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Roger that. This will help me set up the Edelbrock carb the right way - I don't think the previous owner really had a clue what he was doing. It's almost like he just kept cutting hoses until he was down to the bare minimum that he could get away with. Sorting this all out is going to be a LOT of fun.
Thanks for all of your help, guys! I'll keep this updated as I go on - and hopefully anyone else who runs into a similar problem will be able to use this thread as a reference.
Thanks for all of your help, guys! I'll keep this updated as I go on - and hopefully anyone else who runs into a similar problem will be able to use this thread as a reference.
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Well, I chased down some vacuum connections, and now the problem seems reversed: she's making good power while driving, but now she's idling rough.
I am at the end of my rope with this truck. If this goes on any longer, I'm going to - erm, I dunno. I'll do something with it though.
I am at the end of my rope with this truck. If this goes on any longer, I'm going to - erm, I dunno. I'll do something with it though.