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Bonneville GXP/ Northstar Powered Cars Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the 3.5L Twin Cam V6 (Short Star ) 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-14-2010, 02:31 PM   #1
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Default Under the hood questions

just trying to clear few things out

picture #1, is that where the spark plugs are sitting on the GXP?

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picture #2, what is this hose for? its coming to the intake box

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picture #3, what is this valve? or maybe socket?

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picture #4, whats in this box? PCM?

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thanks
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Old 04-14-2010, 04:35 PM   #2
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Yep, the plugs are under them individual coil packs. Good Luck and God speed with the rear ones.

The hose goes to an air-pump. When you do alot of WOT'ing it likes to throw junk on the air filter. Some GXP mysteriously were missing that hose. I wonder if Friday they ran out of them at the plant and forgot to backtrac Monday.

Next little hose is a vent-off from your tranny. Surprised they didn't have our engines suck those vapors into our intakes also.

That box has the Air intake pipe hooked it to the front of it, and the passing air cools the PCM. I figure they made the first box bigger than the second to reduce restriction/improve airflow,
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Old 04-17-2010, 01:14 AM   #3
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Those are some very good questions... I was wondering the same thing about all 3 pictured!!! Thanks for this post!!
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Old 04-18-2010, 01:26 PM   #4
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So what is the best way to the rear plugs? From underneath?
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Old 04-18-2010, 07:46 PM   #5
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No. It'* done from the top. You remove the sway bar, the EGR, then the back cosmetic cover and feel for everything you see in the front. First the coils packs, then the chrome retaining bar, then each plug. A tight fitting extension on the socket helps when bringing the plug out of the hole.
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Old 04-22-2010, 01:31 PM   #6
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Easiest way to replace the rear plugs..... Let someone else do it!!!
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Old 04-22-2010, 02:19 PM   #7
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Quote:
Originally Posted by lances42 View Post
Easiest way to replace the rear plugs..... Let someone else do it!!!
Lance
also the easiest way to know your car well is by doing the work yourself

to each his own, but i really enjoy working on my car, everything on my bonneville gxp was done at home, and same thing with my previously modded GTP. this way i know the job is done right, and if it wasnt im the only one to blame and bitch to lol
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Old 04-22-2010, 02:48 PM   #8
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Quote:
Originally Posted by SAMzGXP View Post
also the easiest way to know your car well is by doing the work yourself
X2
First time I did spark plugs on a 3800 I said "This is the last time I EVER do that", second time was a pain in the butt, took a lot less time though. Now I can swap them out in no time and know it was done right.
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Old 04-22-2010, 02:53 PM   #9
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Yep. Your ready for the next level Tom. Take them out hot.
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Old 04-22-2010, 02:57 PM   #10
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Luckily I haven't had to attempt that one yet. I did just get a nice new pair of gloves though, and I've got some long sleeve shirts. Just gotta stay away from those manifolds.
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