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2G Misfire/subi sound

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JuGs

10+ Year Contributor
674
0
Jul 20, 2008
Marshall, Wisconsin
Ok doing this frommy phone. But I'll try and be as detailed as I can. So when I start my car for the first time in the day it will start and run fine. Only issue I have is sputtering under more than a few lbs of boost. I know I have no boost leaks tested it 5 times now. But that isn't my issue I need help with but could be part if my main issue. So my biggest issue is after a period of driving my car will start to misfire and sound like a subi. It will not accelerate at all. Now once that happens if i shut the car off for 2 seconds and start it, it will be fine again except for sputtering under a few lbs of boost.

What will or is causing it to misfire and sound like a subi after a period of driving but not upon start up? Im thinking possible cam sensor or maf/map sensor
 
Idk if this will work..heres a video of what its doing once it been running a while. Sometimes itll let me rev to 2k...4k...its random and as you see in video sometimes itll jsut die


Edit...guess its not a acceptable file
 
Its a 98 gsx. Only codes I am getting are emissions related. I fixed the o2 code...I deleted all emissions from the car.

Well new cam sensor...maf..o2...and still nothing has helped. So being i deletedthe emissions I also got rid of the purge solenoid(attached to the drivers side intake) will that have any relations with any of my issues?

Picture shows what isnt there any more.
 

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Pretty firm belief this is sensor/electrical/solenoid related. What did you do with vacuum lines that were attached to all the emissions components. The DSM's are kind of a clusterf.... with vacuum lines..

Edit: nvm, deleted ALL emissions... Answer questions above. Lol.
 
Last edited:
Yes im sure it's electrical. But may have fixed the after 45 mins problem. Still working on the spitting and backfiring under boost. Trying another set of plugs soon. And also ordered a new fpr.
 
What was the after 45 minutes problem?

Server misfire/subie sound and absolutely no power. Id be driving and it would literally decelerate as if I turnedthe car off..absolutely no throttle response nothing.
 
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