EGR Discussion

[CrazyCaker]

Just going to deal with the CEL?

I already deal with it being on all the time. I'm running an MT and have no O2 sensors hooked up (besides the WB) LOL, so it's not a big deal I'll just remove the bulb.

 

[magnumP5]

I already deal with it being on all the time. I'm running an MT and have no O2 sensors hooked up (besides the WB) LOL, so it's not a big deal I'll just remove the bulb.

That sounds like a very interesting setup. Standalone using only a MAP sensor? I know some people who, after turbocharging their cars (not Mazdas) who've left the primary O2 sensor out to force the CEL and the 'run rich' code so they have better AFRs in boost. Seems like a lot of sacrifice, no?

 

[MREDDLE]

Just food for thought.
I do know that a turbo car does have MUCH more presser inbetween the turbo itself and the exhaust valves. Due to the fact that the engine has to push the exhaust through the turbo. So would the EGR under lite load and the turbo boosting 0psi to 1-2psi be "looking" for the flow from the exhaust or would the intake manifold presser be greater then that of the exhaust and flow into the exhaust? Maybe I or someone can hook up a light or something that would show when the EGR open and when its closed.

 

[kz9]

Ok, Those are the 2 units that are on the passenger side by the cruise control. Looking at my manual and the IM and hoses, the FS can have the EGR blocked between the IM and EGR. On the ZM it can't.

The FS read off of the IM directly and and the ZE reads off of the passege between the EGR and IM. If you were to block it of on a ZM the pressures would be different and the ECU will throw one.

Now thats not to say on a FS it won't, the sensors could be that sensitve and detect the pressure drop when the EGR opens. If that is the case, then I will be throwing a CEL.

 

[kz9]

Just food for thought.
I do know that a turbo car does have MUCH more presser inbetween the turbo itself and the exhaust valves. Due to the fact that the engine has to push the exhaust through the turbo. So would the EGR under lite load and the turbo boosting 0psi to 1-2psi be "looking" for the flow from the exhaust or would the intake manifold presser be greater then that of the exhaust and flow into the exhaust? Maybe I or someone can hook up a light or something that would show when the EGR open and when its closed.

A light or ethier an e-mail to someone from Mazda enginnering.

 

[magnumP5]

Now thats not to say on a FS it won't, the sensors could be that sensitve and detect the pressure drop when the EGR opens. If that is the case, then I will be throwing a CEL.

I believe this is the case because I know for a fact that if you block off the EGR port you will throw a CEL. We were debating what was causing it and it appears as if that sensor and valve combo is the reason.

 

[kz9]

Good write up......

http://www.asashop.org/autoinc/dec97/egr.htm

http://www.asashop.org/autoinc/nov97/gas.htm


Sounds like it helps lower EGT's and Clyinder temps, which is good. But by the principals behind an EGR, all it is, is riching out your afr's.

 

[kz9]

Good write up......

http://www.asashop.org/autoinc/dec97/egr.htm

http://www.asashop.org/autoinc/nov97/gas.htm


Sounds like it helps lower EGT's and Clyinder temps, which is good. But by the principals behind an EGR, all it is, is riching out your afr's.

 

[downtube]

that is an excellent writeup. thanks for posting

 

[CrazyCaker]

That sounds like a very interesting setup. Standalone using only a MAP sensor?

Yes, the MicroTech has an onboard MAP sensor. My car has been running perfectly for over a year with the EGR open, and I'm sure it will with it blocked off as well. There's no need for the O2 sensors when using an MT as it's a standalone and doesn't require them as inputs.

 

[kz9]

Yes, the MicroTech has an onboard MAP sensor. My car has been running perfectly for over a year with the EGR open, and I'm sure it will with it blocked off as well. There's no need for the O2 sensors when using an MT as it's a standalone and doesn't require them as inputs.

Are you sure its open? I think it fails shut.

 

[CrazyCaker]

Are you sure its open? I think it fails shut.

Could very well be. I was refering to the tube just hanging out in the "open" still connected. We'll discuss more when we meet up though.

 

[hiroshi988]

noob question, but whats is an EGR and what does it do?

 

[downtube]

Exhaust Gas Recirculation. Short answer, it's allowing exhaust gases to flow into the intake manifold, for the purpose of reducing pollution.

If you want more, read the links posted above by kz9.

 

[turbolife]

noob question, but whats is an EGR and what does it do?

Exhaust Gas Recirculation. It re-routes exhaust gas back through the intake on light-throttle/cruising conditions. It gives the gases another chance to have all the hydrocarbons more efficiently burned, lowering emmisions.

 

[turbolife]

Exhaust Gas Recirculation. Short answer, it's allowing exhaust gases to flow into the intake manifold, for the purpose of reducing pollution.

If you want more, read the links posted above by kz9.

Tree'd!

 

[DubbyDoo]

so i have a breather on the tube right now and its running shity if i block the tube with something is that gonan hurt my car/fix/throw a code?

 

[XoX1de]

it wont hurt a car, if i was u i will try it, anyway it wont hurt your car..

 

[DubbyDoo]

i did this to a friends car a few months back he didnt have a problem but i did it and my cars been running lean at idle good on normal driving tho

 

[magnumP5]

Still running lean? I thought you got it running right again?