ECM upgrade (1227730) for stock 2.8 (Page 58/107)
Hudini APR 03, 11:11 PM
Yes, I did this very thing. Just left everything in place plugging the holes. I did verify the CSI did not leak under pressure. I also disconnected the wires and left them hanging. Not really needed as the other end of the wires are not connected to the ECM anymore.

The knock sensor uses the same type connector as the old fan switch on the intake. Since you will not be using the fan switch anymore just reuse the connector on the knock sensor. You will need to splice a new wire to run to the ECM for the knock sensor circuit.
PaulJK APR 04, 12:17 AM
thank you - i'm getting braver about this
Fino APR 04, 06:52 AM
I have a question. Remove the fan switch cut the wire out of the harness and plug the hole?

I read the instructions to be .....move the D8 (egr diag sw, pin C at egr) to GE8 and then cut the wire FROM the fan sw and connect it to the old egr at pin C. Now the fan sw goes to GE8.
Is this an option to use this if you don't want to have the ECM control this circuit?

Also I have not installed my knock sensor yet but I thought the knock sensor went above the oil filter. Is that only true for the 3.4 block and the 2.8 does not have this boss?

What is right?

Ed

[This message has been edited by Fino (edited 04-04-2008).]

Hudini APR 04, 09:58 AM
I'm kind of confused as to what you are asking. You can remove the fan switch and plug the hole, yes. Now you have 2 options: Run a digital EGR or none at all. The 7730 is not compatible with the Fiero 2-wire analog EGR solenoid. It needs a 4-wire digital EGR. On mine I wanted to run the digital EGR so I left my stock EGR wiring alone. I cut the fan switch wire a couple of inches above the fan switch connector, spliced a new wire to the wire from the C500 end of the fan switch wire, then ran that wire to the cooling fan control pin on the ECM (YE8 on my 7730). If you wanted a cleaner install then find the cooling fan wire where it comes through the cabin from the front fan relay and splice it there. It is just a ground wire anyways as that is what the fan switch does, goes to ground when the temp goes above it's set threshold.

I believe Darth's instructions are just a nice way to reuse/repurpose the Fiero's original EGR wires for a nice clean install. My method leaves an extra wire running through the engine compartment that you need to deal with. As it stands now, I had Darth disable the EGR so I don't get a Check Engine Light.

[This message has been edited by Hudini (edited 04-04-2008).]

Hudini APR 04, 10:02 AM
On your 2nd question, here is a picture of the stock 2.8L block, rear side as mounted in the Fiero. There is a plug in the middle of the water jacket that can be removed for the knock sensor:
Fino APR 04, 10:13 AM

quote
Originally posted by Hudini:

I'm kind of confused as to what you are asking. You can remove the fan switch and plug the hole, yes. Now you have 2 options: Run a digital EGR or none at all. The 7730 is not compatible with the Fiero 2-wire analog EGR solenoid. It needs a 4-wire digital EGR. On mine I wanted to run the digital EGR so I left my stock EGR wiring alone. I cut the fan switch wire a couple of inches above the fan switch connector, spliced a new wire to the wire from the C500 end of the fan switch wire, then ran that wire to the cooling fan control pin on the ECM (YE8 on my 7730). If you wanted a cleaner install then find the cooling fan wire where it comes through the cabin from the front fan relay and splice it there. It is just a ground wire anyways as that is what the fan switch does, goes to ground when the temp goes above it's set threshold.

I believe Darth's instructions are just a nice way to reuse/repurpose the Fiero's original EGR wires for a nice clean install. My method leaves an extra wire running through the engine compartment that you need to deal with. As it stands now, I had Darth disable the EGR so I don't get a Check Engine Light.




Ok I looked at the Fiero wiring digram and it makes more sense now. GE8 is the output of the computer to control the fan relay (I was thinking GE8 was an imput looking for the sensor) that one is OK now. The knock senser in the Beretta book shows it to be on the right side front. Got that now.

I am all better now. I should be done shortly now.
Thank you
Ed

EDIT: I was typing while you were posting

[This message has been edited by Fino (edited 04-04-2008).]

Fino APR 04, 10:29 AM

quote
Originally posted by Hudini:

On your 2nd question, here is a picture of the stock 2.8L block, rear side as mounted in the Fiero. There is a plug in the middle of the water jacket that can be removed for the knock sensor:




Thanks Hudini

I got this out of the Beretta book because I am using the 1991 Beretta computer and need the knock sensor for that engine. I do have the 3.4 in my car and this boss is on my car.


Ed
Blacktree APR 04, 10:30 AM
Here's a photo of the knock sensor installed:



[edit to add] Notice that my engine has the boss for the knock sensor like in the Beretta photo, but I didn't use it because it would interfere with my headers.

Below is a photo of the pipe plugs in the intake manifold, where the cold start switch and fan switch used to be.

[This message has been edited by Blacktree (edited 04-04-2008).]

Fino APR 04, 11:34 AM

quote
Originally posted by Blacktree:

Here's a photo of the knock sensor installed:


[edit to add] Notice that my engine has the boss for the knock sensor like in the Beretta photo, but I didn't use it because it would interfere with my headers.

Below is a photo of the pipe plugs in the intake manifold, where the cold start switch and fan switch used to be.





That looks great a lot cleaner.
I got the knock sensor installed and wanted to make sure the wire did not pull loose so I wraped it around the exhaust manufold three times for safety. Don't want that to come disconnected.

Ed
PaulJK APR 06, 02:23 AM
Ryan - is the knock sensor absolutely needed or will the car run OK if the knock sensor is simply deleted in the ECU programming ?