Cold air intake

[Markgase2000]

Well if any body here has ever changed there entire exhaust system they will need a O2 simulator to make the engine behave without throwing codes. This o2 simulator also makes it behave with the porting. I think when you order one it says its for 99 and up sunfires and cavaliers but it worked on my GA and thats what they gave me when I ordered it. As for coolent leaks I mean internally , the coolent leaks into the engine and messes with the oil. Coolent is bad in the oil messes eveything up and can sieze the engine among tons of other thing. Theres no coolent running into throttle bodies so when you remove it you just have to replace the gasket. That gasket was simple to modify but the first time I screwed that up too and it leaked. (pinched the gasket when putting it back on somehow and it made a crease) If your looking to port the throttle body add a couple extra pounds of torque with a torque wrench to make up for the lack of gasket. I highly dont recomend you port the upper and lower intakes or you will be always having to check the oil for a leak , its inevitable especialy since they leak on stock ones quite commonly. Best thing to do is purchase already ported intakes and exhaust manifolds I believe they are ported greater than my home made setup anyway. I forgot what USA site was selling those intake manifolds and exhaust manifolds.

[Forkliftguy]

Hmmm, I didn't really think the WAI would perform that well for the given situation, makes sense though.

Umm, Mark is right on the TB...as far as the 4cyl goes. The V6 DOES have coolant lines running through it though. The manual say to just clamp the lines before removing them.

[Ridenour]

Hmm... alrighty - So I need to clamp the hoses outside of the TB, then when I pull it off, the coolant from the clamp to the TB will empty, then after I put on new TB and reinsert hoses I top off my coolant?

[Forkliftguy]

That's all there is to it. Good luck.

Marc

[Forkliftguy]

Oh one more thing, you can buy a bypass kit so that the TB no longer has hot coolant running through it. This can help performance because you no longer heat the intake air, it stays cool when it enters the engine. The whole point of the coolant going through the TB is to help the engine in cold climates like here in Canada during the winter. Other than that it robs engine power during the summer.

[Ridenour]

Thanks Forkliftguy. Yeh I had heard about the TB bypass, but I live in the great white North of Mid-Michigan, so I don't think it'd be a good idea.

[Forkliftguy]

Good point. Engineers do put a lot of "questionable" items in cars. Some of those things are actually well thought out.