Flame Thrower!
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Joined: May 2009
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Flame Thrower!
My other thread is dying so I decided to start a new one with a new problem. In case you don't know, I have a 83 F250 with a 460.
My engine is backfiring bad. Whenever I drive down the road, I can hear it backfiring from in the cab. It's not so bad that it sounds like a shotgun, but it's throwing smoke everywhere. I changed the spark plugs, cap, rotor, and wires the other day and I put them just like they were. Today I messed with the idle screw and also sprayed carb cleaner in the carb while my wife gave it a little gas. Whenever I push in the gas while in park, if I rev the engine to high rpm, it will shoot a flame out of the pipes. My wife followed me while I was driving the other day and she said whenever I would push in the gas it would flame up in the exhaust and when I would let off the gas it would do it too.
What are my options here? Please be as descriptive as you can because I'm far from an expert. After I get this fixed, my truck should be running perfect. Thanks guys.
My engine is backfiring bad. Whenever I drive down the road, I can hear it backfiring from in the cab. It's not so bad that it sounds like a shotgun, but it's throwing smoke everywhere. I changed the spark plugs, cap, rotor, and wires the other day and I put them just like they were. Today I messed with the idle screw and also sprayed carb cleaner in the carb while my wife gave it a little gas. Whenever I push in the gas while in park, if I rev the engine to high rpm, it will shoot a flame out of the pipes. My wife followed me while I was driving the other day and she said whenever I would push in the gas it would flame up in the exhaust and when I would let off the gas it would do it too.
What are my options here? Please be as descriptive as you can because I'm far from an expert. After I get this fixed, my truck should be running perfect. Thanks guys.
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What's the best way to check the timing? And the best way to fix it if it's not right? When I say I'm far from an expert, I mean far far away. I'm learning as I go. Thanks though!
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Joined: Nov 2007
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From: Denver Metro Area, CO
No disrespect intended, but... Dude, you really need to buy a book....
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lol that's alright.. i have a book already and read about the timing but there's a big difference between reading a book and getting advice from an actual person. Unless, of course, the advice from a person is to buy a book. Why didn't I think of that already????
Modular motor junkie
Joined: May 2009
Posts: 6,190
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From: Texas
I just read the book, and the timing is set for life. You check it and if it is off, you change the ignition module. The book gives good instructions, better than i can give. do you have a timing light?You will need one.
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Moderator
Joined: Nov 2007
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From: Denver Metro Area, CO
Huh? Perhaps on computer-controlled, EFI engines this might be somewhat true
but it certainly doesn't apply to everything.
This brings up a good question, though - does this truck have a feedback carb or
not? My thoughts were no, it doesn't, but maybe I'm wrong. Nor do I have any
idea if the computer controls the timing on such engines....
but it certainly doesn't apply to everything.
This brings up a good question, though - does this truck have a feedback carb or
not? My thoughts were no, it doesn't, but maybe I'm wrong. Nor do I have any
idea if the computer controls the timing on such engines....
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From: Virginia
It's backfiring because there is raw fuel inside the exhaust system. You will have to figure why that is happening. If the exhaust is black and smells like fuel, then I would suspect the carb. If it's not really running rich, I would suspect a timing problem or a valve train problem.
You are probably going to have to take to a garage with a old timer who can listen to the engine and tell you their best guess.
You are probably going to have to take to a garage with a old timer who can listen to the engine and tell you their best guess.
Modular motor junkie
Joined: May 2009
Posts: 6,190
Likes: 8
From: Texas
Huh? Perhaps on computer-controlled, EFI engines this might be somewhat true
but it certainly doesn't apply to everything.
This brings up a good question, though - does this truck have a feedback carb or
not? My thoughts were no, it doesn't, but maybe I'm wrong. Nor do I have any
idea if the computer controls the timing on such engines....
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 38
From: EXTREME southwest CT
Does it pop on trailing throttle?
Is it SO rich it almost burns your eyes?
Really I'd hook a timing light to it to check, but I'd be willing to bet it's the powervalve.
Welcome to FTE suff1cate!
Is it SO rich it almost burns your eyes?
Really I'd hook a timing light to it to check, but I'd be willing to bet it's the powervalve.
Welcome to FTE suff1cate!
