 
     |
| ECM upgrade (1227730) for stock 2.8 (Page 57/107) |
|
PaulJK
|
APR 01, 03:24 AM
|
|
|
{got it} [This message has been edited by PaulJK (edited 04-02-2008).]
|
|
|
|
Darth Fiero
|
APR 01, 01:23 PM
|
|
| quote | Originally posted by PaulJK:
This is a pic from Jon. I think terminal M was active on the '88 models and terminal N was active on some of the earlier years. In this pic, looks like M isn't connected to anything but N is.
I was gonna test these terminals tonight, but i have 3 buffer boards and NONE of them have any circuits connected to K, L, M or N  .
|
|
LOL I guess I forgot about the letter "N"! Sorry it was a long day yesterday. Oh well, if you do find a circuit board trace going to a terminal that doesn't appear to be used I would give it a try anyway.
|
|
|
|
Darth Fiero
|
APR 01, 03:48 PM
|
|
|
|
|
PaulJK
|
APR 01, 07:29 PM
|
|
|
.. [This message has been edited by PaulJK (edited 04-02-2008).]
|
|
|
|
Blacktree
|
APR 01, 11:01 PM
|
|
| quote | | Originally posted by PaulJK: Anything I missed ? |
|
The ECM tray specifically needs to be from a 1987-88 Fiero 4cyl. Also, remember to disable or delete the cold start injector system.
Edit to add: you will need a knock sensor, unless you have it disabled in the programming.[This message has been edited by Blacktree (edited 04-01-2008).]
|
|
|
|
PaulJK
|
APR 02, 05:13 AM
|
|
Blacktree Thank you. How do I delete the cold start injection system exactly ?
I'm not using the fan switch now, so i can just unplug the connection (?) I'd probably remove the sensor and plug the hole anyway.
Right now, the car seems to start and idle fine, but the idle jumps between 900 and 1200 after it warms up and sometimes the car starts to surge and buck. Is this an IAC issue ? Maybe Throttle POsition Sensor ?
I wanna re-read about where you installed the knock sensor .... I saw where ryan said it was needed, but did not see where it could be deleted in the programming. Must be better to have it (?)
How did your stalling problem turn out ?[This message has been edited by PaulJK (edited 04-02-2008).]
|
|
|
|
PaulJK
|
APR 02, 05:37 AM
|
|
|
{got it} [This message has been edited by PaulJK (edited 04-02-2008).]
|
|
|
|
Blacktree
|
APR 02, 10:44 AM
|
|
When I deleted the cold start injection system, I replaced the thermal switch (in the intake manifold) with a pipe plug. And I replaced the tube fitting in the fuel rail with a short (stainless steel) bolt. I couldn't think of an easy, effective way to plug the injector hole in the intake manifold, so I just left the injector in there. You can also delete the wiring, if you want. It's just dead weight, anyway.
The 7730 ECM takes over the function of the fan switch. So you can remove it, and plug the hole. You can trace the wire back to a splice in the harness, and snip it there. The fan switch plug fits the knock sensor. So you can re-use it.
Speaking of knock sensors, mine is located on the trunk-side of the engine block, almost exactly in the center of the block. There's a coolant plug there that has the same size threads. The knock sensor replaces that coolant plug.
By the way, the fan switch and cold start switch both use 3/8" NPT pipe threads.
My stalling issue was caused by a faulty throttle body. The throttle plate sometimes didn't fully close at idle. The inconsistent readings from the TPS were confusing the ECM. After adjusting the idle stop screw, the stalling ceased.
I should also mention that the 7730 ECM seems to be more sensitive to sensor input than the old Fiero ECM. It's very important to have all your sensors in perfect operating condition. When I first installed the 7730 ECM, I had a problem with the engine bucking and hesitating during acceleration. After some investigation with an OBD-1 scanner, I found that my MAT sensor was reading high. As a result, the engine wasn't getting enough fuel during acceleration. Replacing the sensor fixed that problem.
|
|
|
|
mswenson289
|
APR 02, 01:19 PM
|
|
| quote | Originally posted by Blacktree:
When I deleted the cold start injection system, I replaced the thermal switch (in the intake manifold) with a pipe plug. And I replaced the tube fitting in the fuel rail with a short (stainless steel) bolt. I couldn't think of an easy, effective way to plug the injector hole in the intake manifold, so I just left the injector in there. You can also delete the wiring, if you want. It's just dead weight, anyway.
The 7730 ECM takes over the function of the fan switch. So you can remove it, and plug the hole. You can trace the wire back to a splice in the harness, and snip it there. The fan switch plug fits the knock sensor. So you can re-use it.
Speaking of knock sensors, mine is located on the trunk-side of the engine block, almost exactly in the center of the block. There's a coolant plug there that has the same size threads. The knock sensor replaces that coolant plug.
By the way, the fan switch and cold start switch both use 3/8" NPT pipe threads.
My stalling issue was caused by a faulty throttle body. The throttle plate sometimes didn't fully close at idle. The inconsistent readings from the TPS were confusing the ECM. After adjusting the idle stop screw, the stalling ceased.
I should also mention that the 7730 ECM seems to be more sensitive to sensor input than the old Fiero ECM. It's very important to have all your sensors in perfect operating condition. When I first installed the 7730 ECM, I had a problem with the engine bucking and hesitating during acceleration. After some investigation with an OBD-1 scanner, I found that my MAT sensor was reading high. As a result, the engine wasn't getting enough fuel during acceleration. Replacing the sensor fixed that problem. |
|
I had a hard time finding a short 12mm x 1.25 bolt to fill the fuel rail were I removed the cold start from and end up using a 12mm oil drail plug from Orchelins. Use a cooper washer with it as well. On plugging the CSI on the intake I used a 7/8" shallow freeze plug w/ a little RTV.
Mike
|
|
|
|
PaulJK
|
APR 03, 10:36 PM
|
|
Sounds good. Instead of changing all the hardware right off the bat, is it possible to just disconnect the wiring to the cold start injection system and leave the hardware in place to test the ECU upgarde installation ? Will leaving the dis-connected hardware in place hurt anything ?
Does the knock sensor come with a connector to splice into the harness ?
|
|
|
|