bogging down, misfiring..

[xioca]

Alright so before I swapped out my 13g turbo for a 14b i decided to clean up the engine bay with simple green and a garden hose. I covered up the fuse boxes, the air filter and the CAS. So i did this and i drove my car afterwards and it was bogging down, at idle it sounded like i could hear gushing from the left side of the engine bay and figured I knocked something loose. Seeing as I was going to pull most of the vacuum lines and ic pipes I figured it would sort it's self out in the end.

Well being lazy and such it ended up being two weeks before i actually was done, and due to a lack of a 14b coolant line and banjo bolt I threw the 13g back on with a ported 2g manifold, the only differance.

Alright so I got it all back together today and the same problem as I had 2 weeks ago. The was no air gushing out at idle that I could tell, but am going to do a boost leek test first thing tomorrow. I checked for codes on my data logger and there were none. The only other thing that I can think would cause the problem was water getting into the spark plug wells, but two weeks latter I wouldn't think that would happen, still I pulled them and they were dry. The spark plugs are only about a month old too.

I can't think of anything I did to cause it to misfire. Any help would greatly be appreciated.

 

[grnchevyz]

If you can, change your MAS and see if the problem goes away. A fouled MAS will cause the engine to misfire.

 

[xioca]

Well i've been boost leak testing the system over the last few days. After fixing a few minor minor leaks, I seem to only be holding 14 psi and can hear a loud gushing sound from underneath the intake manifold. I am unable to feel any airflow, so I am in the process of removing the excess vacuum lines.

I have no idea where the leak is coming from.

 

[ddavisaf]

It warms my heart to hear this.

Well i've been boost leak testing the system over the last few days.

Pay special attention to the FIAV (Fast Idle Air Valve), injectors, and the intake manifold gasket. If you're not already doing so, hook up your boost leak tester to the throttle body to bypass what you've already checked and corrected. Spray some soapy water all over the intake manifold and other questionable areas to help pin point the leak better. You'll see it blowing bubbles. Good luck, and let us know how its progressing.

 

[xioca]

Well it turned out to be the throttle body shaft seals, now there is no leak. After about 2 days of the car running fine I know have it bogging down under any kind of boost, any ideas about what would cause this?