[PacificMustang01]

Ya, the tune after CAI for SN95's doesn't apply. But you are right about the S197's needing tune after CAI.

I've got SN95 + new CAI and no tune---no problems.

My gut is really telling me it's ERG valve (very cheep) or DPFE sensor (very cheep). both very easy to do.

[PacificMustang01]

Nice lookin vert btw V606er! Like the stripes!

[20Mustang02]

Originally Posted by PacificMustang01 And just saw your response about the shop replacing your DPFE.....are you SURE they did. I don't trust ***most*** shops worth S*i#!! Do a search for those two codes and the 2001-2004 stangs. 9 out of 10 times those codes mean DPFE is bad (although, when you look up the code it says ERG system....but it is really just the sensor). And true, you should just check all of the hoses connecting DPFE/ERG system yourself. It doesn't take being a mechanic to find a broken/un-connected/rotted hose and replace it yourself. And while you are at it....spend the $20 for a shop manual. Those things are worth MORE than their weight in gold....they could save you Thousands in repair costs and also let you know just about everything about your car, and tell you how to fix it step-by-step and with pictures and diagrams. First thing I do when i get a new car is by the shop manual. Good luck bro! I'd bet you that it turns out to be someting very easy, very cheap, and very simple to fix!

Yeah I'm sure the sensor was replaced...While I was at the shop having them take a look at it I went out and bought one and watched them out it on.

Yeah I plan on checking all of the hoses this afternoon....Thanks I'll definitely get that shop manual

[winnie51189]

Originally Posted by RFM 40th V6 Are you still getting the same codes as before? True it is more expensive but if you have to pass emissions it could be more costly to get a tuner and turn off the light. Also the EGR is not open all the time, only under certain conditions does it open. Such as low engine load highway driving. From what you've stated it seems as though you think the EGR is open at least a little bit all the time. You can't say it had no negative effect on your emissions unless you actually measured them before and after. It may be minimal but it's still an effect. I'm not trying to argue but EGR's were invented because of CAFE laws and they wouldn't be on our cars unless they worked.

Good points! You are correct that I didn't measure the effect in any way other than just tracking my gas mileage. I know it's not open all the time. but I drive mostly highway so it didn't hurt much or atleast not noticably. Also I don't have emissions testing around here so I don't have to worry about that.
I also agree that they did create them for a reason but in my mind the affects are negligable when you have it as they are constantly going bad and causing issues. But when they work I'm sure they have some affect. Then again car companies do add a lot of things that aren't actually functional, such as the excessive amount of non functional scoops on our cars.

Oh and you should buy a tuner anyways, just because its one of the best investments you can get on these cars, especially when you have no local dynos.

[PacificMustang01]

Good to hear. I can't stress enough the importance of getting the shop manual.

If you can turn a wrench, follow directions, and know even the most basic things about cars, then you cannot go wrong with that purchase!!! I promise you would not be dissapointed if you are the type who likes to do things them selves....or even if you are not, but want to save a few bucks.

It seems that for the most part things that break are mostly easy/cheap/and require at most an afternoon of your time to fix yourself, and the book will walk you through it all one step at a time, and with pictures. Moreover, the section at the beginning where they list symptoms and then give a list of possible problems is WONDERFUL!

On top of it all, if you do go to a shop and they say "Such-and-such" needs to be fixed This is what it will cost you and why....., at least you can look it up in the book and know what it is all about....and maybe you'll realize that "hey, I can do this myself!".....or at the very least it could help you to know if they are trying to screw you or something. Knoweldge is POWER!

Good luck man. I am still guessing it's very simple/in-expensive fix!!!

[RFM 40th V6]

Originally Posted by winnie51189 Good points! You are correct that I didn't measure the effect in any way other than just tracking my gas mileage. I know it's not open all the time. but I drive mostly highway so it didn't hurt much or atleast not noticably. Also I don't have emissions testing around here so I don't have to worry about that. I also agree that they did create them for a reason but in my mind the affects are negligable when you have it as they are constantly going bad and causing issues. But when they work I'm sure they have some affect. Then again car companies do add a lot of things that aren't actually functional, such as the excessive amount of non functional scoops on our cars. Oh and you should buy a tuner anyways, just because its one of the best investments you can get on these cars, especially when you have no local dynos.

I also agree. I love my chip. Should bought a tuner but I wanted on the fly switching.

The EGR valve has gone away on newer vehicles now. Instead of using the valve and recirculating inert gas through the intake they use the VCT function.

Basically it keeps the exhaust valves closed a little longer under certain conditions.

There is no doubt in my mind that that the EGR works to reduce emissions. After all it's basically making your engine smaller when you don't need it. In terms of how much air and fuel is used.