Misfire on '99 1500

[ahernandez74]

It's funny how easy of a fix it might be.. Spark plugs for a misfire.
Did you end up finding out the issue on your bike? Hope all is well

[John Hopkins]

It's not as unusual for new plugs to be faulty these days, unfortunately we are living in a world where quality control is down to checking 1 in 100 of the production line just to check the tooling, if they find a small fault they reset the tool and keep going so some out of tolerance items get through.. If a firm checked every single plug they would have to double the price and would soon go out of business..some firms only check at the start of a new shift.

John.

[ignitethewill]

Thanks Troll,

I will check the boots again.  Interesting info about the relationship between fuel mixture and demand for spark.  Unfortunately I threw away the old plugs before I realized there was an issue (bad move).  I didn't see any cracks when I checked each one yesterday, but I'll give them another look.

I'll let you know how it turns out.

Cheers,

Matt

[Troll]

Inspect the plug boots on the wires for any signs of leakage. Rich mixtures are easy to ignite, but as the mixture leans out, the spark demand gets bigger....check the porcelain on each of the new plugs for a possible crack. Put the old plugs back in and see what happens....

[ignitethewill]

Good morning,

I put in new plugs on my 1999 1500 Drifter (was running fine, just wanted to put new ones in).  It runs perfect when it's cold (5-7 minutes), then starts misfiring and idling rough.  The misfire causes the bike to buck when trying to accelerate.

I pulled the plugs and the spark looks consistent and strong on each. Is it possible that the new plugs threw off the throttle position sensor?  Any other ideas on what might be wrong?

Thanks!

Matt