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Old 03-05-2010, 06:53 PM
 
Location: Not in Indiana, but bleed Hoosier blood
210 posts, read 666,852 times
Reputation: 179

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This is wierd, my lawnmower will not start, i pull and pull it and nothing. So i decided to check the spark plug and everything seems to be fine. Just as i was ready to put the plug wire back on, i pulled it one more time with the plug wire about 1/4 inch away from the plug and the thing started. It had a nice blue spark while it was a 1/4" away and running. Just as soon as i put the wire back on the plug it died. I take it off, it runs. I dont know what is going on. Could it be a bad plug that is grounding to the head?
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Old 03-05-2010, 07:07 PM
 
10,485 posts, read 22,547,424 times
Reputation: 6611
Do you drive this lawnmower to work, the store, etc daily? Otherwise you are not in the right forum.
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Old 03-05-2010, 07:14 PM
 
Location: Eastern Washington
13,388 posts, read 42,701,155 times
Reputation: 11465
Quote:
Originally Posted by allisonguru View Post
This is wierd, my lawnmower will not start, i pull and pull it and nothing. So i decided to check the spark plug and everything seems to be fine. Just as i was ready to put the plug wire back on, i pulled it one more time with the plug wire about 1/4 inch away from the plug and the thing started. It had a nice blue spark while it was a 1/4" away and running. Just as soon as i put the wire back on the plug it died. I take it off, it runs. I dont know what is going on. Could it be a bad plug that is grounding to the head?
Whats going on is the plug insulator and/or the plug cap are dirty, and this is providing a ground path and shorting the spark out.

If you will spray the outside of the plug with WD-40, and the inside of the spark plug wire cap as well, this *should* cure it.

Or. You could just have a fouled spark plug, your pulling the wire partway off works like a "booster gap" spark plug, which has an internal gap that helps them fire when partially fouled.

I have found that the dip-type carb cleaner buckets will clean up a fouled spark plug pretty well. However a new sparkplug every year or 2 is not a lot for the lawnmower to ask.

LVD is right, of course, although I am not dead certain if this should be towed to the "other vehicle" forum or the "house" forum, or somewhere else...I'll leave that to the pros.
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Old 03-05-2010, 09:52 PM
 
Location: I think my user name clarifies that.
8,293 posts, read 22,453,494 times
Reputation: 3868
Quote:
Originally Posted by allisonguru View Post
This is wierd, my lawnmower will not start, i pull and pull it and nothing. So i decided to check the spark plug and everything seems to be fine. Just as i was ready to put the plug wire back on, i pulled it one more time with the plug wire about 1/4 inch away from the plug and the thing started. It had a nice blue spark while it was a 1/4" away and running. Just as soon as i put the wire back on the plug it died. I take it off, it runs. I dont know what is going on. Could it be a bad plug that is grounding to the head?
Replace your spark plug & clean out the plug wire connection.
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Old 03-06-2010, 05:55 AM
 
6,368 posts, read 13,342,993 times
Reputation: 5858
Plug is fouled. With the 1/4 inch gap you're merely increasing the voltage to the plug, forcing it to fire.
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Old 03-06-2010, 08:09 AM
 
Location: U.S.A.
3,306 posts, read 9,006,224 times
Reputation: 2919
Quote:
Originally Posted by las vegas drunk View Post
Do you drive this lawnmower to work, the store, etc daily? Otherwise you are not in the right forum.
What exactly is the appropriate forum for this sort of thing?
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Old 03-06-2010, 08:30 AM
 
6,368 posts, read 13,342,993 times
Reputation: 5858
Quote:
Originally Posted by Lux Hauler View Post
What exactly is the appropriate forum for this sort of thing?
House forum
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Old 03-06-2010, 08:35 AM
 
Location: U.S.A.
3,306 posts, read 9,006,224 times
Reputation: 2919
Quote:
Originally Posted by Gimme3steps View Post
House forum
And how many people there will have intimate knowledge of internal combustion engines?
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Old 03-06-2010, 08:45 AM
 
Location: Southwest Nebraska
1,297 posts, read 4,022,980 times
Reputation: 893
Quote:
Originally Posted by Lux Hauler View Post
And how many people there will have intimate knowledge of internal combustion engines?
None, I had a thread moved to right forum once and never got anymore answers. You did right by coming here.
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Old 03-06-2010, 08:48 AM
 
Location: CasaMo
15,294 posts, read 7,146,445 times
Reputation: 16384
I think people with car repair experience could help out on a small engine problem, so I think here's ok.
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