Weak spark on one cylinder. The right plug has a weak yellow/blue spark.
Weak spark on one cylinder. It kept fouling plugs left and right. Jun 10, 2017 · I have a briggs vanguard twin 303447 horizontal in a grasshopper mower. So, I proceeded to hook the light to all cylinders to see if it would trigger light Nov 9, 2013 · 86 virago 700 good spark on one cylinder but weak on other. When there's no change in the idle speed, then you have pinpointed the weak cylinder. Kawasaki calls for 52 lbs minimum. Ran compression test on motor. May 4, 2012 · The mower runs smooth on one cylinder but obviously has barely enough power to very slowly cut grass, in addition to dumping gas past the rings and into the crankcase. NO SPARK OR INTERMITTENT SPARK ON ONE CYLINDER OR ONE BANK:1. Feb 21, 2011 · Other issues related to a no spark/Weak Spark/Wet Plugs issue: Wrong flywheel on it. Oct 22, 2011 · On most 2 cylinder Wisconsin engines, the pistons go up and down togatherwhen one is going down on a power stroke, the other is on an intake stroke. Jul 18, 2015 · 1993 Johnson 115 has weak spark on#1 cylinder only. Seems like I only have spark on one cylinder bank, suggesting ignition boxes. Thought it could be alot of carbon on cylinder and head. It starts right up and runs good but the pipe doesn’t get hot on front cylinder and maxes out at 25mph please help no engine lights are showing. When one is coming up on a compression stroke, the other is on an exhaust stroke. I get spark one second and 5 minutes later it stalls and I lose apart to front cylinder only. enginesandmagnets. Dec 19, 2018 · If it is easier to go to ground through the insulation on the ignition wire instead of arcing the gap of the plug under high cylinder pressure, it will. Possible it has been happening since last fall. Aug 18, 2024 · Hi, I’ve got a merc v6 that sometimes struggle to rev up when accelerating. What am I missing? Aug 11, 2017 · The following information helps to identify the causes of weak spark, no spark or intermittent spark. Now it only fires on the top cylinder. Dec 10, 2020 · If the spark is weak or if the insulation (plug wire/boot) has cracks, the spark energy can be diverted to path of least resistance. Jul 31, 2011 · 88 F350 dump7. Oct 5, 2010 · Yesterday, I was riding and came to a stop and the engine also quit,no backfire nothing. I used the spark checker, and it appears the coil on the left side isn't generating spark. Frayed wires somewhere in the wiring harness or under the seat were causing a short; Sled was only running on one cylinder. Sep 24, 2011 · Put NEW intake and carburetor intake gaskets on and fired it up. He could remove one spark plug wire and it didn’t effect the way the Feb 3, 2012 · 1. This unhooks the kill switch, ignition switch and wiring for those switches. Poor boot to plug fit, cracked spark plug insulator, lack of dielectric grease in the boot can also allow spark energy to leak elsewhere. 012 clearance. The former option is the most likely. I can run the sled and pull the wire off the bad cylinder and it does not die just keeps running on the PTO cylinder Oct 28, 2020 · 49M977 30HP B&S Engine Ran fine last year, stopped using around September 2019. exhaust from front pipe smells rich of unburned gas and the bowls are full so i believe its getting fuel just fine. Both cylinders at 130 psi. Not running properly. I replaced the coil, as one plug wire was rough, and it didn't help. Nov 6, 2011 · No Spark, Weak, or Intermittent Spark • Spark plug gap incorrect • Fouled spark plug • Faulty spark plug cap or poor connection to high tension lead • Related wiring loose, disconnected, shorted, or corroded • Engine Stop switch or ignition switch faulty • ETC switch mis-adjusted or faulty • Wire harness or connections wet, corroded Jan 2, 2015 · The coils looked to be producing a weak spark. 3. I believe the sputtering is because it is only running on one cylinder. Nov 13, 2012 · To adjust the points you'll need two small wrenches,on the photo the small nut at the bottom is the check nut,put a wrench on the hex nut at the top near the gap and undo the bottom one. Came to this realization while working through some issues with sputtering. Ran compression test cold AND then ran it just after left cylinder quit AND still pumping 130 psi. 0 answers. Disconnect the stop wires from both power packs and retest. The front cylinder has a white and purple spark. Sometimes moving the spark advance lever will cause it to produce normal spark on that cylinder. I borrowed another CDI with no correction. Sometimes one won't fire. I checked compression today and have 95 lbs on #1 cyl, 155 lbs on cyl #2. Dec 19, 2012 · it is a brand new carb and i cant imagine what would be blocking the intake on the rear cylinder - it would have to be something really big - as far as an orifice in the carb - well i could see some trash making its way there but wouldnt there be a lack of fuel if that were the case - i will investigate more and post - i really want to see the compression numbers - i bought 2 new plugs for it May 9, 2019 · The coil on your ski is a single coil with a wasted spark. Set to 020 when the window is directly above the points, or when the rubbing block of the points is aligned with the widest point of the cam, which is the flywheel key. I pull the plug and that cylinder olny is smoking and the plug is wet l. If one plug is sparking good and one isn't then more than likely it is either a bad plug, plug cap or high tension wire. Cleaned the plugs checked the spark and everything seems fine. The other possibility is the halo mag ring and the electronic ignition module area, maybe loose and vibrating. The right plug has a weak yellow/blue spark. One cylinder isn't firing, but that cylinder has spark? I just got through replacing a $35 ignition module on a single cylinder Kohler magnum--all I had to do was pull the sheet metal shrouds off and replaced it with no problem. Non-resistor spark plugs in use. If the gas is above 1/5 of the open position, the quad starts to go. I ordered a replacement coil, and took off the shroud to begin the replacement. I swapped sides with the spark plugs, which are new, and started the bike againthe problem didn't move to the other cylinder. The engine will be weak, the unburned fuel will foul the spark plug, and the exhaust will pop. Allen; Start date Jul 18, 2015; R. If the spark improves, the problem is within wiring from one of those switches or a switch itself is to blame. But I noticed the timing was difficult to check because the number one cylinder spark is very weak. Jul 25, 2014 · Mower is firing on only one cylinder. The motor sparks a blue flame across the 7/16" gap on cylinders two and four, but no spark whatsoever on cylinders one and three. I have pulled the plugs, laid then on the engine casings and watched the spark. The starboard cylinder has very weak spark. Jun 20, 2022 · I've checked the timing - looks normal - approx 30 degTDC. At high temperatures, this problem can produce bucking or misfires. turtle1173 Chief Petty Officer. Check for one or more possible malfunctions: No spark or weak spark to one cylinder. So basically a single coil sparks for every cylinder even if that cylinder isn't the one under compression. Did a spark test on the problem side - got a weak spark at first, then none at all on 2 successive cranks. Oct 20, 2015 · I have a 94 Vulcan 500 with 17000 miles. On these engines, both plugs fire togather, but one spark is "wasted" This is NOT TRUE OF THE TJD! Nov 27, 2014 · 130 psi cylinder 1, 125 psi in cylinder 2 (the cylinder not firing the fuel). Aug 17, 2018 · I have a 2002 Mercury 25 hp outboard that is only firing on one cylinder. Idle speed very low (800 rpm) often stalls. Jan 23, 2010 · 1. Pull the recoil rope and check the spark at the plug. New plugs. Hope this helps. I heard the motor tone change to normal and then the I could see a good strong spark on the tester. The challenge here is figuring out what's upsetting the fuel mixture or robbing the spark. I cleaned and adjusted the points and replaced the old spark plug wires but no change, still weak or no spark on the starboard cylinder. It had weak spark, but not enough to fire. Mar 23, 2012 · Re: Weak spark on 1977 Evinrude 75hp do a youtube search on testing coils, or visit www. 4 2014 Ford F350Dump6. The plug is cold and the other is hot. I’ve tried to change the ignition boxes but still same issue. BUT, cyl #2 is the one not producing. Mar 15, 2005 · I have a 25hp kohler that will intermittently run on one cylinder. It has a weak spark. runs on one cylinder, right May 24, 2020 · Ok, so, my car has a slight stumble at acceleration and so after hunting around I found the #1 cylinder spark is testing weak (very faint spark) I actually came across this by accident by way of the timing light. Feb 23, 2010 · It lost spark on the one cylinder (clutch side). The bike runs perfect 99% of the time but for some reason it will just randomly cut out and run on only one cylinder then will pick up and run on both. I can pull off the left plug and doesn't phase it. After several tries, it did start but was running in the "bogged down" state. Dec 19, 2016 · Sounds to me also like the new coil is bad, if plugs and wires are good, look for a loose connection on the bad cylinder plug. Dec 30, 2008 · Is it possible for one output of the CDI to give a weak spark to the extent that one cylinder will not run. Usually works fine when engine is cool, or is running. Unfortunately I reversed the polarity on the battery a few days ago and it would not fire at all. Frayed wires in the wiring harness or under the seat caused a short; Sled was only running on one cylinder. Make sure the plugs are not near the spark plug holes when you pull it over. Faulty spark plug. Apr 30, 2010 · I'm a little confused. Jun 6, 2015 · If you see a spark, then the timing is good for No. Mar 22, 2011 · I have come across a problem with one of my Rangers it's a 2009 Ranger 700 XP, The problem is lack of spark on the Right cylinder, I find myself fairly mechanically inclined and everyone knows that for a engine to run there are three basic elements required Air, Fuel, Spark/Ignition source so I attempted the following trouble shooting checks Jul 30, 2016 · Yesterday, it didn't want to start. The cylinder is getting fuel but no spark. Read full answer. The other cylinder has normal spark regardless of spark lever position. i tested vacuum at the test screw between carb and cylender and it seems to match the readings from the rear cylinder. The coils have 0. Roger G. Nov 7, 2010 · Other issues/symptoms that I have seen/read related to a no spark/Weak Spark/Wet Plugs issue: A guy bought a used sled with the wrong flywheel on it. Adjust the gap using the top hex nut,try and find a happy medium for the gap (about 12 thou) in the two positions,then holding the top hex nut in place,tighten the bottom check nut. Ran perfectly for 10 seconds again and dropped left cylinder. Can this be caused by the spark advance module or does that problem have other symptoms? Any other suggestions? BTw I unplugged the ground wire (white) in the wiring harness and this Oct 2, 2023 · Quote Reply Topic: Weak spark on left cylinder Posted: 23 Sep 2023 at 15:19: hi all, Hopefully someone can help me with my problem. The low-side coil was bad. Poor connection at spark plug cap to high tension lead. 2. Apr 13, 2017 · Try swapping its spark plug with one from another cylinder to see if the problem is now caused by that cylinder. 2 cylinder and the magneto cap is a good part. I then replaced the CDI box, and still nothing, still weak on the one side. Usually no spark. When it's running on only one I can pull the plug wire off the left cylinder and typically ther is no spark or sometimes a very weak spark. Engine warmed up: 1. I have 9 new spark plugs. Step 2 : Spin the flywheel rapidly (at least 350 RPM) and watch for spark in the tester window. Spark plug worn, fouled or damaged. The second cylinder is connected. A spark plug is directly involved in generating the spark. The low side coil on his stator read 360 ohms and it should have measured 450 ohms. Using a spark tester, you can confirm you have spark at the spark plugs. Perform the same test for spark with the spark plug to see if it is a good part. ) Jul 5, 2015 · Out of nowhere yesterday after a 200 mile ride it began to run on one cylinder. All appears good. 4. While i was messing with it i just unplugged the front cylinder and it made no difference in the idle so im assuming its not firing,while it is getting spark and the bowl for the front carb is full of Jan 17, 2012 · I am having the same exact issue, wiring harness replaced, ignition,CDI box,coil,fuel pump relay,fuel pump, regulator, spark plugs all OEM and tested in spec. The first thing you want to do is take the spark plugs out of the cylinder heads, put the spark plugs in the spark plug boots and lay them on a cylinder head bolt so they are grounded. They are both on the one kill wire which goes to ground to turn them off so if that wire is grouned somewhere it should not be you get no spark. Nov 8, 2014 · 70HP Johnson- weak spark on one cylinder. It appears to be an intermittent problem. . It has good compression. Jul 18, 2015 #1 Sep 24, 2013 · Re: Weak Spark on one cylinder You wont even need to pull the flywheel, you can gap/clean them from the inspection hole. If the gas is below 1/5 - the square does not pull Clearly one pot. after 20 MPH 1 cylinder would drop off. Aug 24, 2005 · Yes I did switch coils and plugs with the same result #2 cylinder will not fire. See full list on yourmechanic. It has spark when the plugs are out and there the same spark but once it's running it seems to cut out and not fire on that cylinder. Be the first to answer Jul 25, 2011 • Yamaha Motorcycles. 91 Indy 500 liquid, Getting fuelHas 120 PSI in both cylinders yet the mag side does not run. The timing gun was very intermittent on cyl one. It is a faint purple spark. Sep 7, 2010 · Heres what I would do at this point, go get an inline spark tester that lights up when charged(if you dont have one already). Everything is new from the CDI box to the spark plugs, so I'm assuming the problem is before that. Actually, it's the same results. I put an in line spark tester on it and it appeared to have a very weak spark. You can isolate the weak cylinder by temporarily disconnecting each of the spark plug wires, one at a time, while the engine is idling. 005 on each. If you had weak spark and now have blue spark it also tells you that you have a short or a problem with one of your switches. Coils one and three will spark when attached to cylinder 4's terminal on the powerpack. That cured mine going dead after it got hot. Thread starter turtle1173; Start date Nov 8, 2014; T. 7,08 Suburban Z71 . 7 Diesel ,2015 Ford F-550 12'Rack Dump 6. Jul 21, 2009 · The coils looked to be producing a weak spark. I believe that we did test the spark plug wires but I will check again however when I switched coils and plugs I believe that would eliminate the shorted spark plug wire possibility. The other three cylinders are just fine. Perform the same test for spark with the spark plug wire to see if it is a good part. Jan 31, 2010 · 4. I replaced the rectifier and it fired up. When this occurs, that cylinder will not be contributing full power to the crankshaft. Sep 12, 2015 · I tested the fuel pump its pumping 14 oz in 15 secs so that apears to be fine too. Not sure for how long this has been an issue. but if I pull off the right wire it dies. Help! Thread starter Roger G. The engine does not pull (probably one cylinder works); 2. If spark returns, swap the power packs and reconnect the stop circuit. If you had no spark and by unplugging the 4-prong connector you now have spark, that tells you that you have something shorted out in your hand controls, switches like the tether, throttle safety switch or kill switch. As a result, it may not produce a spark, or the generated spark can be too weak to ignite the fuel mixture. (I've installed a low psi electric fuel pump to take the pulse pump out of the loop on that problem, just in case, even though the pulse hose was dry. I've replace plugs and cleaned carb. Aug 12, 2016 · The cylinder is dead, and can be confirmed with a compression test The cylinder is fine, and the ecm is cooked, since the entire ignition system has been replaced it's not the module You haven't said, if there is spark at the rear cylinder or the condition of the spark plugs you changed. Step 1: Clip one end of the spark tester (service part number 19368) to the ignition cable and the other grounded to the cylinder head as shown below. Fuel system issues: A clogged fuel injector or a weak fuel pump can result in insufficient fuel delivery to a cylinder, causing a misfire. I've inspected, disconnected and reconnected the coils and leads. I pulled off the valve cover and found a push rod came off the. It showed a 51 code] Jul 30, 2010 · Also check the spark plug wire condition. 2010 Audi A6 Turbo 2012F350 crew lariat PU Fisher V Plows, Curtis/Airflo sanders ,Toro SBs Exmark 60" standons &Riders x series Echo PB770 Husky 580 BPs echo whackers GiantVac leaf suckersWB Blowers, Toro HL5400 Hydroseeder Salsco13" Chipper Jul 25, 2021 · Assuming it is the same as the VL800 (and I'm sure it is) the ignition is what is called a lost spark system, so both coils fire once per revolution meaning one cylinder fires at the top of the compression stroke and the other fires at the top of the exhaust stroke. Pickup coil gap at spec, new battery, carb cleaned, new fuel lines and filter. You then know for sure if the spark plug is the troublemaker, or if it's somewhere in the path to it. It isn't running currently, because it is only firing on one cylinder. Apr 30, 2014 · I determined the problem was on the left side ( cold header, hot one on the right ). I am not familiar with your ignition setup, but if you've swapped out the plugs and wires, I'd attribute it to a coil, if each plug has its own, a cross-fire due to wires grounding or jumping each other, or a distributor cap issue (again, I'm not familiar with how the distribution is setup, so cap might be the Mar 20, 2013 · The other cylinder has great spark and the engine runs fine on that one cylinder its just weak when the blades are engaged. Joined Nov 29, 2001 Messages 437. com Ed Stoller is a good friend of mine and my go to guy for this stuff and since the coils are very similar the should test similar, I think Ed give's some detailed instruction on testing a Capasitive discgarge coil ( pulse transformer ) Feb 21, 2012 · spark seems constant, but is orange not blue, same on the rear cylinder which is firing. Disconnect the main electrical connector coming out of the engine, and then check for spark again. Then you can work backward through your electrical system to identify which component is malfunctioning. Nov 13, 2023 · Ignition system problems: A faulty spark plug, ignition coil, or ignition control module can cause a misfire in one cylinder. The engine stalls/dies at approx 2000 rpm. Put it on, put the machine on the stand and watch that spark tester very very closly. Mar 12, 2016 · Random misfires that jump from one cylinder to another may be caused by a lean fuel condition or a weak spark. com A weak spark, or no-spark, problem may originate within one or more common ignition system components: Worn or damaged spark plug wire insulation. Allen New member. [did not check for spark on both plugs, did not think of that. The std test is to remove the ground wire , crank the engine and check for a spark. Oct 25, 2021 · Cylinder 1 not firing I’ve checked everything compression is great valves and timing are good fuel pressure is perfect has strong spark… I’ve put in a fuel pump, coil, wires, new battery. May 28, 2014 · May 28, 2014 / Briggs & Stratton V twin Intek running on one cylinder #5 Take the valve covers back off and the plugs out, and rotate the flywheel by hand and watch the rocker arms closely, watch as they go up and down, and watch the actually movement that they make, the amount of travel should be the same for all of them. How to fix: Check the spark plug’s electrode gap. I'll swap it for another one and it will. I figured out the rear cylinder seems to be the culprit. Ordered 2 new coils, installed and still the same. It started up, but on only one cylinder. I have adjusted the valves to 0. Pulled the plugs out, both looked good, light tan color, swapped plugs to opposite cylinders, still run only on one cylinder. Pulling the plugs revealed three normal-looking plugs, but cyl one had some gas fouling. 4 03 Ford F-350 crew PU 5. Apr 11, 2017 · The coils have a diode between them to prevent one interfearing with the other. 5 liter 2000 F250 pickup5. If you have a plug foul out you should see if you had spark falling off or completely dissapear. After we got it back to my house I took it for a ride and found on idle and to about 10 MPH both cylinders were firing. Likewise, coil 4 will spark when attached to cylinders one and three terminals on the powerpack. Nov Oct 1, 2010 · If the weak spark is confined to one plug, the timing is probably not the issue. If the no spark problem remains on the same bank, the stop circuit has a fault. Dec 4, 2022 · If your engine is idling rough, misfiring, or starting hard, one culprit may be weak spark. I'm assuming I have a bad coil but in the interest of saving my company money I wanted to make sure that there isn't anything else I should check before I start buying parts to resolve the issue. However, it can be defective because of wear and tear, carbon deposits, and physical impact. bvf ssqdya roxev sdfcu odzo athmm lojr tvtzs lycehv fgza