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Last summer, I got a cylinder 1 misfire code so I changed spark plugs and wires (since they were old anyway) and everything was good.
2 months ago the code comes back and disappears the next day after gassing up. I figured it was because it was low on gas.
Then a few days ago, it comes back again. I checked the #1 spark plug, wire and coil pack—all fine.
So I figured SeaFoam would clean the injectors and cylinders and hopefully fix it. During SeaFoaming, it added a lean code and cylinder 6 misfire code. But I just cleared them and am hoping it will clear those 2 over the next week as it leaves the system.Also I held a screwdriver (like a stethoscope as per Hayne’s manual) to the injectors for cylinders 1,4,5,6 (2+3 are too hard too reach) and hear the clicking I’m supposed to which means they’re working.
Any ideas what’s going on?
It’s the 3.0 OHV V6 Vulcan if that helps.
Thanks!
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Replies
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You can try this
Do this to make sure no. 1 is the only cylinder giving you prob’s, even though there’s only one code. When the check engine light came on again, it was for the no. 1 misfire? Also, try checking for vacuum leaks.
I saw a comment on the video saying not to do this unless you have individual coil packs which my car doesn’t. Would unplugging fuel injectors work just the same in my situation?
I disconnected the #1 fuel injector and RPMs dropped so I’ve eliminated that. I’m willing to bet it’s a vacuum leak. I’ll buy the supplies tomorrow and check for that.
This can help you check for the vacuum leak.
You might also try this for the heck of it.
BTW, you can use water instead of carburetor cleaner.
Don’t rule out a mechanical issue. Since it seems you have fuel, you might also want to check the compression as well to be sure that’s OK. More detailed information on how to solve these issues here.
http://www.ericthecarguy.com/faq/solving-automotive-performance-issues
Good luck and keep us posted on what you find.
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