Question about 1998 Suzuki VZ 800 Marauder

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It cracks and pops out the exhaust on the number one cylinder at idle.

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Air leak in the exhaust somewhere - check from the header back.

Posted on Jul 01, 2009

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Rough idle and popping on deacceleration 2000 HD Fat Boy


Sounds most likely an intake leak.

With engine at idle, spray a little carb cleaner around where that carb bolts to the manifold, and where the manifold attaches to the 2 cylinder heads.

If the idle speed picks up, there's your leak.

The intake rubber seals rot over time, start to crack, and allow air to enter, leaning out your carb mixture.

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SUZUKI 2005 DR650SE DUAL SPORT RUNS GREAT BUT AT IDLE THERE IS A SLIGHT POPPING IN IDLE RYTHYM, ALSO BACKFIRES SLIGHTLY WHEN DOWNSHIFTING...HELP


Carefully check your intake manifold for leaks, cracks, separation. An air leak on the intake side between the carburetor and the cylinder head would be the cause of popping on the intake side. If there are leaks in the exhaust system, an o-ring seal in the head, or a seal between the head pipe and the muffler, this can cause popping or backfiring in the exhaust.

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Valkyrie has a pop in the exhaust at idle..on #1


well i would start buy checking for vacumm leak at carbs and at exhaust system can do this to most check all rubber seal for cracks and things like that hope this helps

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1996 royal star, left rear valve seems to be sticking or something, getting rough idle with lots of backfire popping from that pipe, and motor is missing badly during takeoff and downshift idling. anybody...


The The Air Injection System AIS for that cylinder could be leaking (chrome pipe running up to a fitting right by the exhaust pipe) or more likely the rubber pipe that goes from the engine intake to carburetor is either loose at the engine or carburetor, or the rubber pipe is cracked, split or broken. This would cause air to be sucked into the crack, split or loose fitting during during acceleration or downshifting.

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Lean pop or only runs on back cylinder and front back fires


Exhaust 'pops' is generally caused by unburnt fuel igniting in the exhaust, air leaks can cause this too.
When you do any carb work its always best practice to check the carb balance and idle mixture settings.
What colour is the spark plug? http://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html

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When riding 2005 fuel injected harley road king, engine pops, backfires, and idles fast, why?


Sounds like the intake manifold is leaking. The area where the leak usually happens, are those two rubber sleeves that go from the heads, (Cylinder heads) to the intake. Sometimes the clamp/s loosen up. Sometimes these rubber sleeves deteriorate, and cracks form.

This makes the engine backfire, pop, and idle fast.

The added air at the wrong time cause a backfire, when you let off the throttle. The added air causes the engine to pop, because the exhaust valve has sucked up some cold air.
The engine idles fast, because more air is being introduced, and not metered by the injection system.

(The exhaust valve thing. Exhaust valves are supposed to open, and let exhaust out right? Well there is a thing called Valve Overlap.
The Exhaust valve hasn't closed all the way yet, and the Intake valve is opening.
The 4 stroke engine, (Of which a Harley is), has these four strokes.
1.Intake Stroke. Fuel/air is sucked in.
2.Compression Stroke. The piston comes up and squeezes the fuel/air mixture.
3.Combustion Stroke. The spark plug lights the fuel/air mixture off.
4.Exhaust Stroke. The spent gases are expelled out.

Your Road King has one camshaft. There are four cam lobes on it.
Intake, Exhaust, Intake, Exhaust.

If you had the camshaft in your hand, and had the gear end facing you, look down the camshaft. You will see those egg shaped cam lobes. You will notice that No.1 cylinder Intake lobe is facing to the left.
No.1 Exhaust is facing to the right.

If you put a degree wheel on the gear end of the camshaft, and had the No.1 Exhaust lobe ramp nose facing straight up, you would see that it's about 110 degrees, before the Intake lobe ramp at .050 lift, comes into play. (The roller, of your roller lifter has raised the Exhaust valve up .050 inch) There is about 55 degrees before the Exhaust valve hasn't quite shut.
This is okay for normal running. Introduce a vacuum leak, and the surge of extra cold air, makes it pop.

Solution? I suggest checking to see if the clamps on those rubber sleeves are loose. You can also spray WD-40 towards the ends of each rubber sleeve, when the engine is idling, and see if it speeds up. Means, one or more, of those rubber sleeves has deteriorated.

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96 Ranger, "Popping" coming from engine compartment


Possibly you have a leaky or cracked exhaust manifold. After the engine heats the metal expands and creates a larger gap. As the engine speeds up the engine noise overcomes the exhaust leak noise and you don't really notice it much until the vehicle gets in to a hard pull or comes to and idle.

Jan 18, 2009 | 1996 Ford Ranger SuperCab

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