Question about 1988 Yamaha XV 535 Virago DX

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Loses power at 4500 rpm, carbs are clean and has no intake leaks. has good sparkplugs an coils are working. front cylinder pops a blue flame consistanly after a few revolutions. exhaust seems colder on front cyl. than rear, but still has good back pressure like rear cyl. this is for a virago 700 or 750

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If your carbs and plugs are fine you may wish to check into you wiring harness to see if you have a cyclinder not firing due to a problem with wiring (frayed or disconnected).

Posted on Oct 22, 2010


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Why does a flame come out of the carburetor when I try to start it

Hard to answer this not enough thing I can say is your carb the is flooding the cylinder with excess gas..and when the spark ignites it is sending the burning gas back into the intake and back through the carb where the air gas mixture comes in...timing could be a problem where the intake valve is still open on the fireing stroke..another could be the internal float stuck in the carb...this allows gas to leak back into the cylinders and intake manifold..before doing anything..need to check a few things out..some of these newer carbs have an electric valve on the bottom of the carb. Is there to keep the gas from leaking out on the ground when the float is stuck..however it does allow the gas to leak back and into your engine..and cylinder..and when you try and start it will throw flames back through the carb...but it also may fill you engine crankcase with gas...and damaging the engine sofirst thing check your oil for gas smell and on the stick..drain it if it does..pull your plug and cover the end so it can't spark..and turn the motor over if the cylinders have gas they will Blow it out.."" The reason to cover the sparkplug end" .

NOTE....this is an ongoing problem with this engine type so after you follow the ustructions,,,if not already on the gas line get a inline gas shut off valve and put it on the gas line and make sure it is OFF when you are done mowing or when the engine us not running..This will happen again if not done...change the filter and oil and you are good to go..By the way I know this fro my own experience with these new carp leak protectors..pass the word....if this is not the problem carb will need to be rebuilt..or renewed.....good luck.

Oct 01, 2014 | Craftsman Snow Blower 26 In. 208CC...

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I get a random misfire code when my engine is idling on my 04 isuzu 3.5L...i have changed sparkplugs, check all coils, replaced fuel injectors and still get same error message...what should i check ne

you could have a vacuum leak somewhere. check the fuel filter, it may be going bad. and battery. all these will cause a random misfire code. as well as your plug wires. intake air leak, spray carb cleaner around intake manifold while engine is running if the idle changes, then you have a leak. Good-day! but check for vacuum leak first! a vacuum leak will cause engine to hesitate and lose power.

Apr 30, 2014 | 2004 Isuzu Rodeo S 3.5L V6

1 Answer

My 2003 suzuki 250 ozark sputters at full throttle

Is engine condition good???? comperssion should be in the range of 150 psi. have you checked tha air box, filter, inlet track for proper condition and no blockage(dirt dobber nest???). Check for air leaks at the intake manifold by spraying arouind the area with carb cleaner while idling, any change in rpm indicates a leak. Re check your work in the carb. A "cleaned carb " and a properil overhauled and adjusted carb can be 2 different things.

Jan 12, 2013 | Suzuki DR-Z 250 Motorcycles

1 Answer

1985 Goldwing, 1 cylinder is popping at idle when bike is cold

Hi, Anonymous if your carburetor/exhaust is:
COUGHING is usually caused by an air leak in the intake system and will generally have the same telltale signs, a wet or damp buildup of oil/gas seepage at the intake manifold to cylinder head or carburetor to intake manifold connection and in rare instances a worn throttle plate shaft and or seals.
POPPING on deceleration is usually caused by a lean fuel condition or an air leak in the exhaust system and is generally located where black carbon soot is seen as a flashing build up from any joint connection. This condition can easily be remedied by removing and cleaning both joint pieces and reassembling with high temp silicone and torquing the exhaust clamp to the proper spec.
SPITTING is usually caused by a faulty accelerator pump and or nozzle, or the float bowl needle and seat leaking and overflowing through the main jet mixing well nozzle, or the air-fuel mixture screw is adjusted too lean.
BACKFIRING is usually caused by a sticky/tight intake valve or a timing issue, 180 degrees out or cam chain off 1or 2 teeth.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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Sep 28, 2012 | 1985 Honda GL 1200 Aspencade Gold Wing

1 Answer

Po104po105po1o6 misfires

First the po 171 is that bank 1 is running lean, as far as the codes po104-106, i think you made a mistake, the mifire codes for cylinders 4-6 would be po304, po305 and po306. the fiurst thing to check would the fuel preasure.

The reason i say fuel pressure is due to the misfiring and lean codes.
If the fuel pressure tests okay then check for intake manifold gasket leak, this is done with a smoke machine or with some throtle body cleaner spray. you will neeed to start the engine and spary around the intake gasket area as you watch for engine speed change.
A scan tool may be needed to watch fuel trim and o2 readings if the intake leak is small.
The other problem could be sparkplug failure or bad coil and last sparkplug wires if this is not a coil on plug system.
Acoil on plug system would be a system with out sparkplug wires going to each sparkplug, instead there is a separte coil on each sparkplug.
If this is a coil on plug ignition system i would start there and swap coils with the other cylinders and see if the misfire moves to those cylinder if it does then bad coils. hope this is helpful , good day

Mar 03, 2012 | 1998 Ford Explorer

1 Answer

How do I determine if my p0301 error is a bad ignition coil or an air leak in the intake manifold or egr or pcm system

Hello, The code 301 is a misfire in the number 1 cylinder. The Code p0351 would indicate a bad coil or coil wire.

The other concerns you have would have their own codes. What you can do is spray water around the Number 1 Injector seat when the engine is running and if the seal for the Injector is drawing in air, the water will change the RPM.

You can also use a spray bottle of water around the Intake manifold to find air leaks. If the gaskets check out good and the Injector seal is not leaking, you are pretty much looking at a bad sparkplug or bad Injector for #1 cylinder.

Jun 28, 2011 | 2001 Mercury Sable

1 Answer

My vz800 only runs on the front cylinder. The back kicks in and cuts out through the power band. I have been through the carbs and cleaned all the jets and air ways. If I hold my hand over the rear intake...

Hi Aaronstarnes, and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and leaking.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, module, and or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose/broken connections at battery terminals/cables, especially the "NEGATIVE" cable at both ends, ignition coil, or plug between ignition sensor and module.
7. Intake air leak.
8. Water, dirt, or rust in the fuel system, carburetor and/or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose, dirty, or corroded ignition module connector at crankcase.
13. Faulty MAP, CKP, and/or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damaged intake or exhaust valve.
For more information about your issue, please visit the websites below. Good luck and have nice a day.
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May 26, 2011 | Suzuki VZ 800 Marauder Motorcycles

3 Answers

Front cylinder misfire at idle,then raise rpm's to 2000 area an it comes in an out popping thru exhaust.front cylinder cold to the touch when rear is hot, till it runs a couple of min. New plugs, good...

I am not sure if the bike is a 650 or 1100 but in either case it sounds like a fuel issue or and air leak. When the carbs were off for re-jetting did they get cleaned? The slow circuit controls to about 2000 rpm and it sounds similar to your problem.

The first thing to look at is the carb synchronization. If the front cylinder is lagging, it can give the same symptoms. I do not think that the exhaust is a factor because the front is cold when running.

Spray some WD 40 at all the intake manifold area when the bike is running and see if the idle changes. the idle will change and push some smoke out of the exhast if the intake is leaking.

If both of these check good I would pull the carbs back off and clean the slow circuits out completely. This is delicate work and shoud be done by and experienced tech.

If I can help some more just send message.

I hope that his helps. Steve

Jan 18, 2011 | 2004 Yamaha V Star Classic

1 Answer

At first my bike would not rev over 4500 rpm under load, then this went down to about 2000 rpm. Now it wont start at all. When i turn it 0ver on the starter, all it does is pop and bang through the exhaust...

Make sure intake and exhaust are clear of any obstructions. It really sounds like its a timing issue. Not coils. Its firing when the valves are open instead of when they are shut. Check timing, and get new plugs. You may have to replace some of the timing parts.

Oct 11, 2009 | 1996 Honda CBR 600 F(3)T

1 Answer

2002 jeep cheroke misfires on cylinder #4

Check intake gasket and vecuum hoses near intake runner #4. To do this spray carb cleaner at parting line between manifold and block while engine is running. If leaking rpm will dramatically change. A leak will lean out that cyl and cause misfire

Feb 25, 2009 | 2002 Jeep Grand Cherokee

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