Question about 2005 Honda VT 750 DC Shadow Spirit

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Starts fine then starts to backfire, it's like the plug in the front cylinder isn't firing all the time. exhust doesn't get hot on that cylinder

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Check for power from the coil, sounds like its bad

Posted on Mar 12, 2011

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What is the spark plug gap why is 1 of my exhust pipe hot and the other is not


Dave:
Your #1 cylinder ( the front cylinder) is not firing. It could be that the spark plug is fouled or improperly gapped, or the carburetor is not delivering gas to the cylinder. pull both spark plugs Clean the plugs and gap them. The gap should be about 0.035 In. (thirty five thousandths). Reconnect the wires to the spark plugs. Lay the spark plugs against the outside of the cylinders with the metal part of the spark plug body touching the cylinder (creating the ground part of the circuit). push the starter and look for spark at both spark plugs. If you have spark at both plugs, put them back in and start the bike and check the exhaust pipes to see if they are both hot. If one is still cold, the carburetor for that cylinder is not delivering gas. Could be a kinked or clogged fuel line, disconnect the fuel line from that carburetor and see if gasoline flows out. If gas flows out, the carburetor needs to be tuned or removed and cleaned.

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clean exhust pipe.
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Backfire is the result of unburned fuel in the exhaust igniting. I would look at the timing. Could be out enough for this to be the cause. Good starting point in my opinion. Not usually a plug issue.

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86 f150 302 has no power starts fine but when u take off can only give it a little gas or it feels like its running out and somtimes backfires through intake


2 possible reasons 1 check ignition timing and adjust. 2 check for crossed plug leads on 2 cylinders --firing order.

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Were is spark plug number 1 at on my 3 cylinder geo metro


On GM inline engines,cylinder #1 is the one closest to the front(pulley)end of the engine. If you pulled the wires off the distributor/coil pack,and don't know where they go,put one wire one at a time and crank it.If it doesn't backfire,repeat until it starts.(this is only easy on 4 cylinder or smaller engines)

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No spark to rear cylinders runs good and then runs on one cylinder 1986 honda shadow 1100


try switching the position of the two coils, the plug wires will unscrew off of the coils and that way you dont have to pull the spark plug wires too,(be sure and change the 2 wire couplers too) if your front cylinder stops firing you know its the coil, if the back cylinder still doesn't fire then your coil is good and you either have a bad #2 spark unit or a bad crank pulse generator.

Aug 05, 2011 | 1998 Honda VT 1100 C Shadow Spirit

1 Answer

I have a 95 Road King that isn't running right, it


Backfiring out of the exhaust is usually an ignition problem. Unburned fuel is getting into the exhaust system because it's not being ignited in the cylinder. When the engine fires on that cylinder again, it ignites the raw fuel in the exhaust causing the pop that people call a backfire. I'd investigate the ignition system. Connect a timing light to each of the spark plug wires if it has a single fire ignition or either of them if the ignition system is the stock dual fire. Start the engine and watch the timing light to tell if the engine is missing as the light will miss a flash.

Good Luck
Steve

Jun 05, 2011 | 2000 Harley Davidson FLHR-FLHRI Road king

3 Answers

My 98 grand prix gtp (3800) (L67) wont start...wines then BACKFIRES. everything from the heads up are brand new except the coil pack housing which ironically enough was submerged in antifreeze. however i...


If your firing order is correct(165432), then I would suspect the drenched coil pack. That oily antifreeze will penetrate every nook and cranny of the coil. It's probably shorting out and cross-firing. I would go ahead and replace it. Double check your firing order again. The back cylinders are 2-4-6, counting from to back, but that is not the firing order. The plug wires would attach to the coils in the following order, counting from the front of the coils(nearest to the front of the car)to the rear:1-4-5-2-3-6.Let me know if any of this helps you. Good Luck.

Dec 28, 2010 | 1998 Pontiac Grand Prix

2 Answers

Car won't start, wait 15 min. will start but kinda backfires.


possible ignition coil pack breaking down...unit cools off them fires plugs again...fuel pressure is a concern also ..possible failing fuel pump

Jun 25, 2009 | 1995 Chevrolet Caprice Classic

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Rear cylinder not firing


The first thing I would do is replace the spark plugs again. You can foul a plug and it will cause you more problems than you can ever imagine. I see you have done all the logical things that I would recommend but I did not see you have replaced the plugs after the 200 miles. You would be surprised at how many times a $2.00 part can cause fits beyond belief.

Dec 07, 2008 | 2000 Harley Davidson XL 1200 C Sportster...

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