Question about 1988 Ford F 250

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Backfires thru the carb

I have a 1988 Ford f-250 with a 6 cylinder and it backfires thru the carburater. What is the trouble.

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  • jk_arena Jan 02, 2009

    I have a 1988 ford pickup with a six cyl and cant get it to run. I have checked the timing, replaced the cap. rotor and it still backfires thru the carb. Help

  • jk_arena Jan 02, 2009

    1988 backfires thru carb. I've changed out the rotor, dist cap, plug wires and the coil still no help.

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If your ford-straight six (it is six,right?)
backfires,
1,check plugs,are they fouled!?
2,do comp check,to check for bad valves.
3,YOU DONT HAVE A TIMING CHAIN!!
you have "gears in a straight-six",
any way check timing of gears(valve),and ignition,you may have a bad drive gear on the distributor,or a bad ignition modual in the dist'
also,pull the valve cover off,and check the rockers for anything unusual!
I just finnished a chevy "poping",--rocker nuts worked loose!!
(buy them NEW,they are cheap!!)

Posted on Jan 06, 2009

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I would have to agree with ed... it does indeed sound like the timing belt. replacing it before it breaks would be advisable. if it should break while the motor is running you may cause other damage to the motor.

Robert

Posted on Jan 02, 2009

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I haven't noticed any one suggest a compression test, but If I were sure the timing was correct I would suggest running a compression check. A couple of things that can cause this problem, besides timing, would be a bad set of wires or a burned valve. Of course if it jumped time that would do it too.

Posted on Jan 02, 2009

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Hi, looking at all responses from my collegues can I suggest a possible air leak? maybe Manifold/Carburettor sucking Air? does this happen under load? or just on accelleration? if under load maybe inlet area needs investigation? if kicking back off throttle increase then maybe Condensor/points gap or ignition leads tracking down. PLEASE bear in Mind I'm across the pond in the U.K. so I'm assuming by the age of your truck it has points. My last F100 did.
Good Luck!
Paul 'W'

Posted on Jan 02, 2009

  • Paul W
    Paul W Jan 02, 2009

    Hello again! I've given your problem some further thought and is there a possible chance of a Valve or two being burned out? Too high octane fuel? worn distributor? maybe a good compression test will help? please get back to me I'm intrigued.

    Paul 'W'

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Hi
For a carbureted engine, backfires can be caused by the valve train timing being way out.
Set your timing properly first, and then move forward from there.
Blackened plugs definitely mean too rich a mixture, and maybe not enough spark to burn it all.
I've never seen a bad vacuum hose cause backfiring, but it will help very much to fix any vacuum leaks you can find.
Those vacuum indicators are useful if you are trying to synchronize dual carbs.
Nevertheless, backfiring is not usually caused by a malfunctioning carb, it's a timing issue.

I would set the timing, and move from there. You may have a defective distributor.

Good luck.

Posted on Jan 02, 2009

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If you already checked timing, and replaced rotor caps, try lowering down the idle screw, check carb filter, and if you have a carb at hand, replace the carb. If the carb backfires when idling, it may be the carb overflowing with fuel.

Posted on Jan 02, 2009

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You have a worn timing chain that has jumped a tooth.
Rotate the distributor to see if it clears up the condition.
If the condition improves, you are def going to need to replace the timing chain, if it jumped one tooth today, it will jump another tooth tomorrow,

Posted on Dec 31, 2008

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Check your timing

Posted on Dec 31, 2008

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Was it running when you bought it? Backfire could mean something as simple as a cracked distributor cap or rotor(come in a kit,about 25 bucks to replace).
Could be jumped timing chain on the expensive side of things.
The little ignition module on the side of the distributor can go bad also. don-ohio (:^)

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Hi Tyrone, More information would be good? does the vehicle backfire during acceleration or deceleration? Is the engine petrol or diesel? have a cylinder compression test carried out. To do this, remove either a spark plug or glow plug from each cylinder one at a time. Have someone inside the vehicle to crank the engine and keep a foot flat to the floor on the accelerator pedal. Crank the engine ten revolutions and take the reading. The reading should be around 90 to 110 lbs and not vary between cylinders more than about 8 lbs. If you have a variation greater, take an oil can and squirt twice into the combustion chamber. If the reading improves, the indication is worn rings. If the reading remains more or less the same, the indication is burned valves. The latter is more likely the cause of backfiring. Backfiring can also be caused by incorrect ignition timing. If the vehicle is fitted with points and condenser, a defective condenser can be the cause, but it is better to replace both at the same time. Hope this has been of some help. Regards John

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Plugs


For a carbureted engine, backfires can be caused by the valve train timing being way out.
Set your timing properly first, and then move forward from there.
Blackened plugs definitely mean too rich a mixture, and maybe not enough spark to burn it all.
I've never seen a bad vacuum hose cause backfiring, but it will help very much to fix any vacuum leaks you can find.

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