Question about 2005 Harley Davidson XL 1200 C Sportster Custom

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Seems there is an vacuum leak from carberator

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The best way I've found to track down intake - or vacuum leaks is to spray some WD-40 on the suspected area with the engine idling. If there's a leak, the idle speed will change noticeably. Do use caution, however, because WD-40 is extremely flammable.

Posted on Nov 19, 2009

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What is making my 1973 volkswagen beetle pop and backfire out of the carberator throat?


3 possible reasons
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Honda 350 year 2006 quad is not idling proper and when you ref it up and let the ref of it back fires. Would this be wear in the carberator.?


not so much wear in the carby as loose carby mounts and or vacuum leaks. faulty idling and backfiring on deceleration is a sign of lean mixture

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My f250 just put on new carberator still sounds like vacuum hose disconnected where should I look


there was an old trick my dad use to do. where take a can of starter fluid and spray around the carb. not directly in but in the vicintity of said leak. use to work great when there was a vacuum leak.

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Small vacuum leak showed up on auto parts machine. need a vacuum diagram. best way to locate the leak. we tried with a special doctors hearing device but did not hear nothing


The easiest & quickest way I have found a vacuum leak and I am in the business is to get a can of carb cleaner. When the engine is running start spraying along all your vacuum lines and connections. Also along the throttle body or carberator and around the intake manifold. As you're spraying if the lidle of the engine changes then you have found the general area of the vacuum leak. From there on you can begin to narrow down the location until you find the source of it. I hope this helps and good luck.

Aug 06, 2011 | Dodge Ram 1500 Cars & Trucks

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My 1993 mercury grand marquis has a vacuum leak between back of engine and firewall. the pvc has been changed, all plugs and plugs wires were changed. it idles very rough at stop lights and now after a...


it sounds like you may have 2 problems.
1st vacuum leaks are fairly easy to find if they change idle/accelleration,alot of times you can hear
it,the use of carberator cleaner spraying different vac hoses & gaskets while engine idles to see a difference in the way the engine idles(goes up/ down in rpm's)or using a unlit propane torch.if its a very tiny vac leak then a smoke test can be done.
your hunting to find rev/drive maybe a worn switch or linkage

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2000 cadilac deville dts started with a missfire on cileder 3. I changed the plugs, boots, coil pack, fuel filter. car ran better still has a miss when i am in gear with my foot on the brake. I found that...


is there a check engine light on? did you change the spark plug wires?
you may have a intake gasket leak or possibly a cracked intake manifold. there is a simple test to try to determine if there is a leak in the intake but it can be potentially hazzardous. with a can of carberator cleaner, spray around the intake gasket and manifold. if the engine revs up, there is a leak. you can also purchase a vacuum gauge and test the amount of vavuum the engine makes. typically 17-22 hg. connect the gauge to a main vacuum port such as the hose to the brake vacuum booster

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GSF 600 SV 97 fuel problem


If the bike will run with the choke on then you have a lean fuel/air mixture condition. Most common cause is a vacuum leak or faulty pitcock. Spray some carb cleaner around the carb mounts with engine at idle, if the rpms change there is your leak.
Your petcock should have two hoses attached to it. One hose is the main flow to the carbs. The other hose is/should be a vacuum hose that allows the gas to flow (when vacuum is applied). When your petcock is in the PRI position, this will bypass the vacuum hose. Leaving it in PRI when motor off could possibly flood the engine. Check to see if that vacuum hose is attached properly with no splits or cracks near both joints. If all is attached properly your problem is the petcock itself. It has a diaphragm and 'return' spring. Weak return spring, clogged petcock, damaged diaphragm can all cause your problem. Also, after you recleaned and inspected the carbs, were they synched... if not, this needs to be done.
Good luck...i hope this helps..please rate me a fixya.

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I have a popping sound coming up from my carberator when i accelerate what can it be


It's backfiring. This can be caused by a vacuum leak. If a vacuum hose falls off or wears out and leaks it will cause a lean condition that will cause the engine to backfire. If your not familiar with cars this should be a cheap fix.

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1 Answer

1984 chevy s10 2.8l rochester carberator.


check all the vacuum lines and make sure there are no leaks, i had the same problem an thats all it was

Dec 09, 2008 | 1984 Chevrolet S-10

1 Answer

CORRELATION VACCUM LEAK P0068


P0068 - Throttle Body Airflow Performance (PCM) (Vacuum leak)
Take a can of carberator spray and spray it around the unpper intake area and near the throttle valve housing, listen for the engine to make a different sound, when it does you have found the leak. It may be minor or major there is no way to know. If you can't find any vacuum leaks replace the MAF sensor.

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