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Old 03-07-2013, 04:21 PM   #1
grimzwrx720
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Default Violent shaking during acceleration

Changed my maf sensor Monday cause of check engine light need also to change o2 sensor.
After changing the maf the car runs like crap.
Idles fine but no power. Hesitates at acceleration then at around 3k rpm and up it violently shaked from front to back so hard made me think It was going to explode. Crazy.
I pulled into a gas station on the highway filled up a full tank from a quarter tank. After leaving the gas station and having to accelerate to merge on the highway it started to shake again for a sec then smoothed out. Didn't do it the rest of the 30 min highway ride.
After the changing te maf it's no where near the same.
Things I'm think it could be
I have to change the clutch it really in its way out. Not sure if that could contribute to it cause it felt like when you shift into a gear and its low of a rpm an it shakes but it felt like 100 times worse.
I know I have to change the rear o2 sensor
I have 2 little vac leaks
Maybe after disconnecting the battery during the maf changing it has reboot or read the way I drive
Maybe I need a tune I'm just trying to see what other people's suggestions are before i go need with it myself
Mods:
Perrin intake and cat back
Any suggestions or advice would be greatly appreciated
Thanks
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Old 03-07-2013, 05:23 PM   #2
nhat
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What were the CELs? Are you replacing parts for the sake of replacing them? Or are these parts related to the CELs?
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Old 03-07-2013, 06:37 PM   #3
grimzwrx720
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Replaced the maf cause when I got a smoke test the shop told me it was bank 2 lean I already knew that
They said there was no way to tell which o2 it was and said that needed to change the maf and should take care of it
I knew he was wrong
I dot know the code off hand will find out later tonight
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Old 03-07-2013, 07:58 PM   #4
nhat
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The rear o2 would not cause what you're describing, nor would the front o2.
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Old 03-07-2013, 11:37 PM   #5
art@grimmspeed
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Did you make sure the MAF is facing the right way?
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Old 03-08-2013, 01:07 AM   #6
grimzwrx720
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Codes:
P0171 rear o2
P1130 front o2
P0442 gas leak or gas cap
I do have a exhaust leak so it's possible it's throwing the p0171? It's a bad leak have 2 3in slits in the pipe after the cat
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Old 03-08-2013, 01:08 AM   #7
grimzwrx720
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Facing the right way? I replaced it the same way te other one came out
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Old 03-08-2013, 01:54 AM   #8
Andrewxxcarlson
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Where'd you get the MAF sensor...possibility of faulty sensor?
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Old 03-08-2013, 09:21 AM   #9
grimzwrx720
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I got it out of a running 03
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Old 03-08-2013, 10:01 AM   #10
booSTin-scoobs
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I just fixed a p0171 cel yesterday. The problem was the front o2 sensor for me
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Old 03-08-2013, 10:07 AM   #11
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Also if the front o2 sensor is bad it will cause your car to run like ****

Last edited by nhat; 03-08-2013 at 11:50 AM.
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Old 03-08-2013, 10:22 AM   #12
Turd Nugget
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Have you changed your plugs recently? First thing I would do is pull them out, inspect them and check the gap. Too big of a gap can cause violent misfires and its usually most noticable under WOT
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Old 03-08-2013, 10:42 AM   #13
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Quote:
Originally Posted by booSTin-scoobs View Post
Also if the front o2 sensor is bad it will cause your car to run like ****
Yes, but it doesn't cause what the OP is describing.

Last edited by nhat; 03-08-2013 at 11:50 AM.
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Old 03-08-2013, 01:45 PM   #14
booSTin-scoobs
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Quote:
Originally Posted by nhat View Post

Yes, but it doesn't cause what the OP is describing.
No it doesn't, I just wanted to be sure he didn't overlook the front o2 sensor being bad
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Old 03-08-2013, 01:56 PM   #15
grimzwrx720
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Going to purchase the o2 sensors today maybe change them tomorrow hopefully
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Old 03-08-2013, 02:01 PM   #16
booSTin-scoobs
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Better bring your checkbook. They ain't cheap
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Old 03-08-2013, 03:24 PM   #17
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Quote:
Originally Posted by booSTin-scoobs View Post
Better bring your checkbook. They ain't cheap
Not if you know where to look.
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Old 03-08-2013, 03:26 PM   #18
booSTin-scoobs
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I got mine from advance auto parts for 175, my guy showed me the "walk-in" price, it was 250
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Old 03-08-2013, 03:32 PM   #19
grimzwrx720
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I was gunna go to subaru but forget that they were way too much
I'll have to go to autozone or advance
Wondering if I should stick with denso or go with Bosch
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Old 03-08-2013, 03:34 PM   #20
booSTin-scoobs
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I don't think the brand matters all that much for an o2 sensor, they're both good brands
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Old 03-08-2013, 03:56 PM   #21
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Why dont you pull out the plugs and check the gap?....its free and easy.
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Old 03-08-2013, 06:59 PM   #22
grimzwrx720
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Well I have to change the sensors anyway

What am I looking for when checking the gap
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Old 03-08-2013, 07:05 PM   #23
SedonaRedwagon
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Quote:
Originally Posted by grimzwrx720 View Post
I was gunna go to subaru but forget that they were way too much
I'll have to go to autozone or advance
Wondering if I should stick with denso or go with Bosch
always go denso, bosch tends to make crappy sensors

also did you clean the MAF before you put it in? could be something as simple as that.
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Old 03-08-2013, 07:10 PM   #24
grimzwrx720
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No didn't clean it afraid of messing it up
I know it worked from the previous car
I did purchase denso front and rear it was like $320 for both I know it's expensive but indont care want my car clear of codes
There is a seperate code for the maf sensor?
If there is it didn't come up
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Old 03-08-2013, 07:17 PM   #25
grimzwrx720
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To clear the codes I'm gunna fix the exhaust leak and the 2 little vac leaks and see what happens
If not fixed I'm gunnna change the sensors and that should do it
As fr the shaking I'm gunna see if it had anything to do with the sensors but I'm sure it has something to do with the maf cause it only happened after changing it
Then check the spark plugs and stuff
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