kensin

iTrader: (22)

So I have a 94 ca FD and recently throwing a code 16 egr
I went through the pile of paper from the PO and found a document for EGR being replaced with a new one 2 years ago .
Anyways. I took the egr apart for inspection. And it still looked brand new and the gasket on it is still complete and in good space. I cleaned it up a little ,hooked it back up. And after a short while the code is back up again. Any tricks ? It's bugging the crap out of me. If i use a non CA ecu i know that would eliminate the cel light. But dose it alter the way it runs to a point id fail emission?


What size is the stock bov hose on the y pipe?

jza80

iTrader: (32)

Don't know about the hose but a Federal spec ECU should work although you probably will need to unplug the EGR position sensor to ensure that the ECU does not get a strange grounding condition.

My Federal spec 1995 (no EGR required at all) has the EGR position sensor wire hanging loose where it would plug in to the EGR sensor, and also the vacuum solenoid plug hanging loose, should the car be so equipped for California emissions. I think Mazda used the same wire harness for all 1995's and the California spec ones had EGR with the position sensor and the Federal ones did not have EGR at all. I have run 1994 and 1995 ECU's in this car and everything works fine as I have a resistor in the solenoid plug for the time I used a 1994 ECU

Moving the discussion back to your car, you will have the EGR vacuum solenoid already plugged in, and that will be detected by the Fed spec ECU, which will not be looking for the EGR sensor. So the computer will not know the difference. Just pick up a 1994 Federal ECU, unplug the position sensor, and you should be fine. The calibration is going to be the same, the difference was that the California version had the OBD-1 EGR position sensor to detect if the EGR valve did not open as it should. As long as your EGR is actually opening, then there should not be a difference emissions-wise.

Alternatively, you could probably also use a 1995 Federal spec ECU, this used a different calibration that eliminated EGR so NOx control came from the calibration only versus calibration + EGR for the earlier MY (if you are uncertain about the EGR valve function). You would probably need to cut the EGR solenoid control wire if doing this this, like as if using a PFC.

EDIT: on further reflection, you will probably need to dummy up a "connection" to the EGR sensor wire to get past visual inspection at smog check time. Maybe remove the sensor side of the plug connector internally or something. The smog check guy may do a functional check but there will be no way for them to know the circuit is broken, they will just see a nice happy wire connection...

mkiv98

iTrader: (5)

I have bought an out of state ECU to pass a stock FD in california before. It will work because it will not throw the EGR code.

kensin

iTrader: (22)

Well so far it's running ok and not throwing codes

I took off the connector and clean it real good. Something I missed when I took the unit off.

j9fd3s

iTrader: (3)

i did the same. i used the N3A7 JDM ecu too, it needs the same 4 wires removed like the Power FC

Natey

iTrader: (19)

Passing smog is one thing, but once you got your sticker, I'll bet you're gonna want to deal with the problem instead of hiding it.