truck backfires when driving
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Freshman User
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ive been doing research and i can't find any easily followed instructions... could you please explain what I have to do?
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Freshman User
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sorry for the double post.... allow me to explain my problem a little more.. The truck idles perfectly..and If I am easy on the gas, i can cruise around.. But if I give it too much gas, it backfires like crazy.
Laughing Gas
Joined: Oct 2010
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From: Rock Valley, IA
Edelbrock has their owner's/maintenance manuals online. You need to know your part number. As for the backfiring. If you're able to idle fine but get the backfiring out of the pipes at acceleration I would say you need to go to a smaller CFM. For example, I have a 650 CFM carb on my truck and I have a 460 in it.
If you don't want to get a different carb, then Edelbrock does have a metering rod chart that you can use to lean your mixture but you'll have to take the carb apart to do it.
Edelbrock carbs are simple to work on but knowing what to buy can be tricky. I have never messed with my metering rods as my mixture was fine.
The 1407 carburetor owner's manual is here.
You can look for the exact model of your carb here.
The chart I was referring to is on page 18.
If you don't want to get a different carb, then Edelbrock does have a metering rod chart that you can use to lean your mixture but you'll have to take the carb apart to do it.
Edelbrock carbs are simple to work on but knowing what to buy can be tricky. I have never messed with my metering rods as my mixture was fine.
The 1407 carburetor owner's manual is here.
You can look for the exact model of your carb here.
The chart I was referring to is on page 18.
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From: Virginia
And you haven't messed with the timing have you?
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Alright.. I finally learned how to adjust the floats.. The floats did seem to be off a bit.. I adjusted them to where they are about right.. I don't even an electronic caliper, so I just eyeballed it using sockets...Well Anyways.. Now it wont start.. and to compound the problem, the truck now tries to turn over even when the key is turned off.. please help.
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From: Virginia
The truck probably keeps turning over because you replaced the solenoid with one from China, and they like to stick. This is a case where new is not always better. If you happen to still have the old one, put it back on and see if it stops doing it.
It won't start; With the truck off, look down the carb throat as you push the throttle open. Does fuel quirt into the engine?
It won't start; With the truck off, look down the carb throat as you push the throttle open. Does fuel quirt into the engine?
Thread Starter
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Freshman User
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The truck probably keeps turning over because you replaced the solenoid with one from China, and they like to stick. This is a case where new is not always better. If you happen to still have the old one, put it back on and see if it stops doing it.
It won't start; With the truck off, look down the carb throat as you push the throttle open. Does fuel quirt into the engine?
It won't start; With the truck off, look down the carb throat as you push the throttle open. Does fuel quirt into the engine?
any quick fixes to get it unstuck?
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https://www.ford-trucks.com/forums/1...-problems.html
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Freshman User
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Rap on it with a screwdriver handle or something of similar mass, see if that unsticks it.
https://www.ford-trucks.com/forums/1...-problems.html
https://www.ford-trucks.com/forums/1...-problems.html
Haha.. That did the trick! I went and got my battery charged... and boom, the bitch started right up! It no longer backfires! I believe I finally fixed it! I just drove it and it works pretty good.
Now a small problem is that when I floor it, it doesn't really pick up. I think my problem is that I don't have the downshift cable hooked up correctly. The carburetor bracket doesn't seem compatible with my truck, so I have them jerry rigged to the throttle.
Posting Guru
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You might want to adjust your timing too.
My truck back fired like crazy, fixed my choke, flooded. Rebuilt the carb, still backfired like mad. Replaced some ignition module a little better, at first. Eventually started to okay with timing, and now she's running like a top!
My truck back fired like crazy, fixed my choke, flooded. Rebuilt the carb, still backfired like mad. Replaced some ignition module a little better, at first. Eventually started to okay with timing, and now she's running like a top!
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Freshman User
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You might want to adjust your timing too.
My truck back fired like crazy, fixed my choke, flooded. Rebuilt the carb, still backfired like mad. Replaced some ignition module a little better, at first. Eventually started to okay with timing, and now she's running like a top!
My truck back fired like crazy, fixed my choke, flooded. Rebuilt the carb, still backfired like mad. Replaced some ignition module a little better, at first. Eventually started to okay with timing, and now she's running like a top!
Posting Guru
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1. Start the truck.
2. Find the dizzy(distrubutor cap and assembly)
3. Underneath it there's a bolt, most are 1/2. Loosen it, a full turn-ish.
4. Barely rotate the dizzy, idle will get higher, or lower depending. You'll probably stall it a time or two until you fully learn how little it needs to be moved. Be VERY cautious as the engine is running, belts are turning, and that meat shredding fan is spinning.
5. Tighten and test drive!
I had bad spark knock once I got my flooding issue fixed so I messed with timing and it's been great since...cept this cursed whistle...
Alot of people get setting timing and adjusting timing confused. You don't really need to use the marks, it will help you out more then likely, so will setting it by vacuum. But let's face it, is it necessary? Not really. It's like using the tach to shift, is it needed? No you can do it just as good without.
If you have a vacuum gauge I suggest doing that way. Google or fte search vacuum timing.
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From: Virginia
You should use a light for your timing. You are correct, you can adjust it, test drive it, adjust it, test drive it, etc. But you need to know where you are at so you do not go way off the chart and the point of no return. You can at least know where you started with a light, so you can put it back if things go wrong. I have found that sometimes you end up moving it too much if you go by the rpm of the engine.
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It's really easy.
1. Start the truck.
2. Find the dizzy(distrubutor cap and assembly)
3. Underneath it there's a bolt, most are 1/2. Loosen it, a full turn-ish.
4. Barely rotate the dizzy, idle will get higher, or lower depending. You'll probably stall it a time or two until you fully learn how little it needs to be moved. Be VERY cautious as the engine is running, belts are turning, and that meat shredding fan is spinning.
5. Tighten and test drive!
I had bad spark knock once I got my flooding issue fixed so I messed with timing and it's been great since...cept this cursed whistle...
Alot of people get setting timing and adjusting timing confused. You don't really need to use the marks, it will help you out more then likely, so will setting it by vacuum. But let's face it, is it necessary? Not really. It's like using the tach to shift, is it needed? No you can do it just as good without.
If you have a vacuum gauge I suggest doing that way. Google or fte search vacuum timing.
1. Start the truck.
2. Find the dizzy(distrubutor cap and assembly)
3. Underneath it there's a bolt, most are 1/2. Loosen it, a full turn-ish.
4. Barely rotate the dizzy, idle will get higher, or lower depending. You'll probably stall it a time or two until you fully learn how little it needs to be moved. Be VERY cautious as the engine is running, belts are turning, and that meat shredding fan is spinning.
5. Tighten and test drive!
I had bad spark knock once I got my flooding issue fixed so I messed with timing and it's been great since...cept this cursed whistle...
Alot of people get setting timing and adjusting timing confused. You don't really need to use the marks, it will help you out more then likely, so will setting it by vacuum. But let's face it, is it necessary? Not really. It's like using the tach to shift, is it needed? No you can do it just as good without.
If you have a vacuum gauge I suggest doing that way. Google or fte search vacuum timing.
Posting Guru
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It's under neath it. I didn't see mine either but then my dad used to have the same truck years again and was like its right here. I have a i6 and there's a wad of wires that go over the bolt and it hid it on me