Question about 1966 Ford Mustang

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Engine backfire on decelleration Timing Checked

Engine backfire on decelleration Timing Checked Vacuum checked Flowmaster exhaust system?

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If is doing it thru the carb then the fuel mixture is too lean, if is in the exhaust (also called after-fire) the fuel mixture too rich.

Posted on Sep 04, 2010


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have you checked the timing chain for wear because if the chain gear has chipped it can cause that to happen, some of those chains are made of plastic Teflon and they can brake off so I would look to see if that might be the problem, or recheck the points and the timing.

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This could be anything from bad ignition to timing to bad fuel supply (lean) to bad valves in engine. Run compression test to eliminate worst case, check both ignition and cam timing, vacuum leaks, ignition module.

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  • Backfiring in internal combustion engines occur outside of the combustion chamber, and are typically the result of an improper air to fuel ratio. This can be caused by a vacuum leak, Idle air control valve, throttle position sensor, oxygen sensor, or just about any part of your emissions contorl system.

  • Backfires may also occur before the combustion chamber. One possible cause of this is igniton timing. If the timing is too advanced, the spark plug fires before the intake valves close, causing the combustion to propagate into the intake manifold, further igniting the air-fuel mixture there; the resulting explosion then travels out of the carburetor or intake and air filter. Alternatively, the engine timing may be retarded, in which case the combustion is not completed by the time the exhaust valves open, allowing the combustion to propagate into the exhaust system.

  • Improper wiring of the ignition can also lead to timing issues and backfires, or faulty coil or igniton modules.

  • Low fuel pressure, clogged fuel filters, and weak fuel pumps could cause a severe lean air-to-fuel ratio with fuel injection systems.

  • Missing or damaged catalytic converters can result in backfires out the tailpipe, but very uncommon, and usually only applies to engines set up for race applications.

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I have a Yamaha dragstar xvs 1100cc year 2002 as seen in Vidio , it has straight through slash pipes on it , I've had bike 2 months and now it's backfiring loads more on decel , I'm told to change the

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Excessive fuel consumption, backfire on decelleration, and rough idle

put a vacuum guage on the intake I hope its an automatic one foot on the brake and one on the gas in drive slowly accelarate if the vacuum falls to or near O as you accelerate you have a restricted exhaust,
If this information is helpful to you please give me a fixya! Rating

If I can help in any way please let me know Thanks

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