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Old 06-19-2010, 04:27 PM   #1
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2001 SL1
Default Possible Throttle Body damage??

I thought I had fixed a p0410 a few months ago but it recently came back. As I was diagnosing the issue, I decided to check if the throttle body needed cleaning. I cleaned it about 2 months ago but the inside of the pivot plate was caked with carbon and soot. Upon removing the throttle body to inspect the icv, I noticed some pitting in the chamber next to where the tip of the icv spindle sits. I've posted pictures but couldn't get in there close enough and have it be worth looking at.

Anyone know what's caused this? I can't say it wasn't there in the past but this is the first time I'm noticing it. I'd assume some massive amounts of heat are to blame, but I've the therm and ects and temp gauge are all working properly...any ideas?

Also, what's the best way to clean out the top part of the injection system (what the throttle body leads into)?
I'm thinking that the 410 is caused by clogged exhaust ports though the car blows exhaust out the tailpipe ok - just assuming since the throttle body is caked.
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Last edited by bxxpeace; 06-19-2010 at 04:28 PM. Reason: added 410 info
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Old 06-19-2010, 06:46 PM   #2
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1999 SC1
Default Re: Possible Throttle Body damage??

First of all, the throttlebody. That pitting is probably just a non-smooth area of the casting of the throttlebody. That section has no need to be smooth, since it's just an air passage.

The buildup of oily crud in the throttlebody and intake manifold (what you called the "top part of the injection system") is normal for the S-Series, a result of the EGR system, the valve cover system, and the PCV system. There isn't a simple way to thoroughly clean the intake manifold, but the buildup normally doesn't cause problems.
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Old 06-23-2010, 04:10 AM   #3
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Default Re: Possible Throttle Body damage??

Thanks for the reply.
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