2007 Suburban LTZ - P0121, P0304 codes
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CF Beginner
Joined: May 2016
Posts: 2
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2007 Suburban LTZ - P0121, P0304 codes
New to the board, any thoughts/tips/pointers are appreciated.
Throwing an intermittent p0121 code
- Cleaned throttle body
- Cleaned MAF sensor
Now a p0304
- Changed the #4 plug - fouled and oily
- Changed the coil pack
- Changed the SP wire
- Did a compression test - has compression
- Doesn't eat oil - 1/2 Q at 3k
The 304 error went away for 2 weeks and just popped back up and it now idles and runs horribly. The Sub has 124,xxx miles. My other Sub has 210,xxx. I do maintain them. Should I change the TPS? That doesn't help the 304 but could clear the 121. Are they interrelated? Any other DIY tips on the 304 code?
Thanks
Throwing an intermittent p0121 code
- Cleaned throttle body
- Cleaned MAF sensor
Now a p0304
- Changed the #4 plug - fouled and oily
- Changed the coil pack
- Changed the SP wire
- Did a compression test - has compression
- Doesn't eat oil - 1/2 Q at 3k
The 304 error went away for 2 weeks and just popped back up and it now idles and runs horribly. The Sub has 124,xxx miles. My other Sub has 210,xxx. I do maintain them. Should I change the TPS? That doesn't help the 304 but could clear the 121. Are they interrelated? Any other DIY tips on the 304 code?
Thanks
CF Beginner
Joined: Dec 2010
Posts: 1
Likes: 0
New to the board, any thoughts/tips/pointers are appreciated.
Throwing an intermittent p0121 code
- Cleaned throttle body
- Cleaned MAF sensor
Now a p0304
- Changed the #4 plug - fouled and oily
- Changed the coil pack
- Changed the SP wire
- Did a compression test - has compression
- Doesn't eat oil - 1/2 Q at 3k
The 304 error went away for 2 weeks and just popped back up and it now idles and runs horribly. The Sub has 124,xxx miles. My other Sub has 210,xxx. I do maintain them. Should I change the TPS? That doesn't help the 304 but could clear the 121. Are they interrelated? Any other DIY tips on the 304 code?
Thanks
Throwing an intermittent p0121 code
- Cleaned throttle body
- Cleaned MAF sensor
Now a p0304
- Changed the #4 plug - fouled and oily
- Changed the coil pack
- Changed the SP wire
- Did a compression test - has compression
- Doesn't eat oil - 1/2 Q at 3k
The 304 error went away for 2 weeks and just popped back up and it now idles and runs horribly. The Sub has 124,xxx miles. My other Sub has 210,xxx. I do maintain them. Should I change the TPS? That doesn't help the 304 but could clear the 121. Are they interrelated? Any other DIY tips on the 304 code?
Thanks
Chris- did you ever solve this issue? I have the same 2 engine codes. the P0121 I can live with, but the intermittent P0304 causes my Suburban to run horribly as well.
