How to Diagnose a Cylinder Misfire
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- čas přidán 30. 06. 2024
- Clark Beard, CDI Electronics' Senior Technical Service Specialist, walks us through how to diagnose a cylinder misfire. Please check out the links below to see the tools and test equipment Clark recommends using to help you diagnose a misfire.
511-9764 - Inline Spark Tester
www.cdielectronics.com/product...
511-9766 - Spark Tester
www.cdielectronics.com/product...
511-60A - Digital Multimeter with DVA Adapter
www.cdielectronics.com/product...
511-6996 - Johnson Evinrude Remote Starter
www.cdielectronics.com/product... - Auta a dopravní prostředky
My friend Josh needs help diagnosing an engine misfire . Can you help him?
I haven’t been able to find any video describing my issue. The power pack the coil packs the spark plug wires and the spark plugs are all good but I’ve got a cylinder misfire on three and four. It’s a 115 Mercury mariner 1984 to 1988 and it has six cylinders three carburetors. Carburetors have been rebuilt and also DC voltages have been checked and everything sparking the way it should.
Hey there. I have a 2011 60 horse Mercury Bigfoot 4-stroke. I take my boat out and my boat runs good for a while and coming back it starts missing and runs half tottle . I go home and it cools down and runs good at the house. The next time it does the same thing. Do you know what the problem might be.
We need help with our 2002 crownline boat, it will idle and start fine but when we put it in reverse it dies. What do we do about that?
Tohatsu outboard does not get gasoline into the cylinders. The injector, ecu, spark plugs are intact. When I pour gasoline into the pistons, it works a little. When you press the starter, oily gasoline comes out of the exhaust. Greetings from Turkey..
Would these tests work on a car engine?
My 1992, 200hp 2.5L Mercury wont exceed 3,000 under load! Forums said stator, so I replced it with a CDI stator. Also swapped new power packs, and a newer trigger. Still won't get up over 3,000. Idles and starts as usual. Happened after 20+ minutes of 4,500 RPM running great (just lost power), so I'm thinking ignition, not fuel (lost power like shutting off a light switch). Picked up a DVA adapter, going to try that.
I had the same problem on my 125merc 2stroke, I did a link & sink, cleaned the carbs, & still would not get on plane, rebuilt the fuel pump, & still nothing! So it narrowed itself down to the accelerator pump, & sure enough, that was the fix!
@@mlipsey66 Mine was the float needle seat in the top carb backing out!!! Pulled the intake cover off and sprayed gas into the carbs and the boat sped up when spraying into the top one! Inside the carb was like-new clean, it was just the seat that backed out.
HI Mr. Clark Beard,my name is Kara?My 2001 25hp Yamaha 4stroke is surging at full throttle,what do you think is the problem?F25ELHZ.
clogged/restricted fuel filter?
Mine misfires mid throttle out of the water out of the intake manifold but just before the carbs. What could cause that?
Did you figure it out?
@@SamandKadenGoPlaces yes and no. I fix it. But then it screws up another cylinder. One I track that down #6 goes acts again. I have not had all 6 cylinders fire reliably since.
Were are u located
I'll make a long story short. My XP200 wasn't misfiring. changed the stator and stuff and then it was misfiring. spent 2 years getting pissed off. come to find out it was my own fault. The OMC flywheels are kind of a bitch to take off, so i put on my 3 armed puller and got it tight as heck, nothing. so i took my air powered hammer/chissel with a hammer head on it and gave the flywheel a 5 second shot which was like 500 blows. came right off. took 2 years to figure out that I cracked the internal timing magnets in the center hub doing this, not the exposed charging magnets that actually do come loose. not those ones.
Check the oil level
'89 mariner not getting fire to 1, 2, 3..not plugs?
How do you test spark plug wires?
Here is the procedure in my service manual :
"Test spark plug leads for continuity. Calibrate ohmmeter on low ohms scale. Attach one ohmmeter lead to each spring terminal. While wiggling both spark plug covers and the entire lenght of the spark plug lead, the resistance should remain near zero ohm. Replace spark plug lead if your test result vary."
Also inspect the insulation of the spark plug lead to see if there is a crack section. The rubber insulation of my bottom cylinder was cut by the cowling latch when I bought the engine. Continuity was good on the ohmmeter, but the spark was probably arcing out of the insulation.
If the spark plug leads are good, check your ignition coil. I had to change one on my 1996 25hp. Since then, it run great! I hope it help.
anyone try to contact this company???
Wouldn’t an old timing light do the same thing?
It's just RPM... (timing for One Single Minute) It's NEVER RPM's...!
Don’t by their junk, sucks having to diagnose new equipment failure. I should have bought the replacement coil instead of switching to cdi downgrade! I do not recommend unless their quality control gets better.