spark plug carbon build up
#1
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![Question](https://www.rx7club.com/images/icons/icon5.gif)
How come my plugs get a build up of carbon so quickly?
The car runs perfect on new or cleaned plugs, but after a week you can tell it's not perfect anymore, and voila, plugs have carbon build up.
I've cleaned them with Marvel Mystery Oil and some gentle filing, and have had great results - the car runs perfect for another week.
How do you prevent this?
The car runs perfect on new or cleaned plugs, but after a week you can tell it's not perfect anymore, and voila, plugs have carbon build up.
I've cleaned them with Marvel Mystery Oil and some gentle filing, and have had great results - the car runs perfect for another week.
How do you prevent this?
#4
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Sounds like you're running rich. Black deposits? Change your air filter, your fuel filter, and have your injectors purged or ultrasonically cleaned. That should take care of it ![Big Grin](https://www.rx7club.com/images/smilies/biggrin.gif)
And oh yes, check for any codes, an O2 sensor will cause your car to run very rich (it did to me), as will a faulty TPS, AFM, Water thermosensor, or IAT sensor.
Good luck!
-Ross
![Big Grin](https://www.rx7club.com/images/smilies/biggrin.gif)
And oh yes, check for any codes, an O2 sensor will cause your car to run very rich (it did to me), as will a faulty TPS, AFM, Water thermosensor, or IAT sensor.
Good luck!
-Ross
#5
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It is a TII, stock. I've done the following recently:
-fuel filter
-plug wires & plugs
-MMO premix
-air filter
-belts
Fingers will checking for codes lead me to problems with O2, TPS etc? I have the TPS lights which I think I can use to check for codes? I've never done that before.
-fuel filter
-plug wires & plugs
-MMO premix
-air filter
-belts
Fingers will checking for codes lead me to problems with O2, TPS etc? I have the TPS lights which I think I can use to check for codes? I've never done that before.
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trickster
2nd Generation Specific (1986-1992)
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07-01-23 04:40 PM