Spark plug gap question
#1
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Thread Starter
Spark plug gap question
Hello everyone,
I'm planning on doing my spark plugs in my 05 Civic LX Special Edition Sedan in the next few days. My car has 120K on the odometer. I purchased the NGK PZFR6F-11 from amazon and got the plugs for about $9.00 each, so I didn't break the bank by paying $24 each at my local dealer.
I checked the gap on the 4 plugs I got and the gap is .040 (using the small round spark plug gap tool). I know that OEM Spec is .043.
My question is, do I need to increase the gap by .003 or can I leave it alone?
I read on several other post that the tip/electrode is very fragile on these plugs, so I don't want to mess around and ruin the plugs. The box also has a pic/diagram showing not to try and gap these.
Should I leave the plugs alone or gap them?
Thanks.
I'm planning on doing my spark plugs in my 05 Civic LX Special Edition Sedan in the next few days. My car has 120K on the odometer. I purchased the NGK PZFR6F-11 from amazon and got the plugs for about $9.00 each, so I didn't break the bank by paying $24 each at my local dealer.
I checked the gap on the 4 plugs I got and the gap is .040 (using the small round spark plug gap tool). I know that OEM Spec is .043.
My question is, do I need to increase the gap by .003 or can I leave it alone?
I read on several other post that the tip/electrode is very fragile on these plugs, so I don't want to mess around and ruin the plugs. The box also has a pic/diagram showing not to try and gap these.
Should I leave the plugs alone or gap them?
Thanks.
#2
If you think a good mechanic is expensive, try hiring a bad one
Re: Spark plug gap question
Leave it alone, that's close enough it won't cause problems. IMO
#3
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Thread Starter
Re: Spark plug gap question
Thanks, Ezone.
What are some symptoms if the gap is an issue? Just for my knowledge if after I do the install and experience odd behavior.
Thanks.
What are some symptoms if the gap is an issue? Just for my knowledge if after I do the install and experience odd behavior.
Thanks.
#4
If you think a good mechanic is expensive, try hiring a bad one
Re: Spark plug gap question
Misfire issues that are resolved by correcting the gap.
Note, misfires can have many different causes so you shouldn't automatically jump to a conclusion like that without just cause
Note, misfires can have many different causes so you shouldn't automatically jump to a conclusion like that without just cause
#5
If you think a good mechanic is expensive, try hiring a bad one
Re: Spark plug gap question
Come to think of it....the Fit my GF is driving now is running on plugs gapped less than spec by about 0.2mm.
Spec was 1.3mm, it's running fine on plugs with 1.1mm gaps.
Spec was 1.3mm, it's running fine on plugs with 1.1mm gaps.
#6
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Thread Starter
Re: Spark plug gap question
Thanks Ezone.
I just wanted to make sure I wouldn't have any problems. It sounds like a very small difference is fine, but a significant difference could cause problems.
I'm hoping to do the install today if the rain letup. It looks like a quick 30 min job if I don't run into any problems like a stuck plug.
Thanks.
I just wanted to make sure I wouldn't have any problems. It sounds like a very small difference is fine, but a significant difference could cause problems.
I'm hoping to do the install today if the rain letup. It looks like a quick 30 min job if I don't run into any problems like a stuck plug.
Thanks.
#7
If you think a good mechanic is expensive, try hiring a bad one
Re: Spark plug gap question
Have you ever checked the accuracy of your gapper wheel? (using a micrometer)
They are so cheap it wouldn't surprise me if it isn't perfect.
They are so cheap it wouldn't surprise me if it isn't perfect.
#8
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Re: Spark plug gap question
You beat me to the punch, Ezone. I was gonna say I bet my tool was not accurate. I have two of the gap tools and one puts the spark plugs really close to .043, whereas the other puts them all at .040. They are all installed and it took about 10 minutes total. I started the car, and it cranked like usual.
Below is a pic of the old spark plugs. They don't look bad, but two plugs have darker tips than the other, and all 4 are scorched at the bottom of the porcelain. Do these old plugs look like they aged fine or is there an indication of a possible problem?
Thanks.
Below is a pic of the old spark plugs. They don't look bad, but two plugs have darker tips than the other, and all 4 are scorched at the bottom of the porcelain. Do these old plugs look like they aged fine or is there an indication of a possible problem?
Thanks.
#9
If you think a good mechanic is expensive, try hiring a bad one
Re: Spark plug gap question
The stains ("scorch") above the hex is corona stain, that's normal.
The one with blackened threads may have been a bit loose and allowed carbon to creep up the threads.
The one with blackened threads may have been a bit loose and allowed carbon to creep up the threads.
#10
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Re: Spark plug gap question
Thanks Ezone. Everything seems all good. I drove around for a few hours (put on about 45 miles) and the car feels great. Shifts good and accelerates good too. Not sure if this is an improvement over before, but with the old plugs in, the car drove fine too. No complaints.
Thanks.
Thanks.
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