On a 1985 ford F-150 straight 6 cyl. when i decelerate it backfires bad.
What could cause this?
2006-11-27 04:45:16 · 9 answers · asked by walkec16901 1 in Cars & Transportation ➔ Car Makes ➔ Ford
Sounds like timing, bad coil wire, or you have a valve for your upstream/downstream emission hoses that is stuck
2006-11-27 07:25:28 · answer #1 · answered by kayef57 5 · 0⤊ 0⤋
First, a backfire is the uncontrolled combustion of fuel in the exhaust system, a burp would be a "backfire" that comes through the intake/carb. Makes sure you know which is occurring since the causes of each will be different.
If it is a true back fire coming out of the exhaust then fuel is making it to the exhaust system without being burned, Causes can be poor carb adjustment (more than likely a worn carb in your case) allowing a too rich mixture to enter the cylinder which in turn allows fuel to make it into the exhaust since it could not all be burned in the cylinder. Timing issues could cause this although you should have other symptoms as well like poor fuel economy or hard starting.
If the engine is "burping" it is almost always due to ignition issues, either timing is off or there is a problem with the distributor/iginiton coil.
2006-11-27 05:29:33 · answer #2 · answered by shifty67 3 · 0⤊ 0⤋
Timing chain, Definatley the timing chain, the engine has "jumped" time and is firing the cylinders perfect although the valves are starting and closing on the incorrect circumstances. This ends up in sparks going off even as there is not any gas contained in the cylinder (lacking) the backfires are probable those neglected cylinders being packed with fumes after lacking ignition then being ignited previously or in the course of the intake cycle permitting the fireball to flee.
2016-11-29 20:27:30 · answer #3 · answered by plyler 4 · 0⤊ 0⤋
Excessive fuel, timing off, any one of a number of things can cause this. Dead plug in one or more of the cylinders. High tension wire problems...the list goes on.
2006-11-27 04:50:16 · answer #4 · answered by oklatom 7 · 0⤊ 0⤋
it could be a cracked head that lets exoust in to the cylender and couses a secondary ignition timming plugs there are a number of things the best thing to do is take it th a shop and check it out..
befor some thing realy goes bad and the engin goes to sh.........
2006-11-27 04:55:04 · answer #5 · answered by red 3 · 0⤊ 0⤋
The timing of the distributor is off. Go see a mechanic. That will do the trick. Good luck!
2006-11-27 04:50:15 · answer #6 · answered by *Balanced*Sweetheart*Always* 2 · 0⤊ 0⤋
The timing could be off, or it could be an exhaust valve hanging up and igniting into the exhaust system.
2006-11-27 04:55:14 · answer #7 · answered by sethle99 5 · 0⤊ 0⤋
Sometimes cars need to release gas, just like humans!
2006-11-27 05:00:41 · answer #8 · answered by AnnieD 4 · 1⤊ 0⤋
CHECK CARB BASE GASKET.
2006-11-28 03:00:42 · answer #9 · answered by midnighttoker 3 · 0⤊ 0⤋