Pennock's Fiero Forum
  Technical Discussion & Questions
  Almost there.. need some advice

Post New Topic  Post A Reply
Email This Page to Someone! | Printable Version


next newest topic | next oldest topic
Almost there.. need some advice by SemperFi18
Started on: 10-04-2021 12:42 AM
Replies: 11 (154 views)
Last post by: buddycraigg on 10-08-2021 08:46 PM
SemperFi18
Member
Posts: 58
From: Spokane Valley, WA
Registered: Aug 2016


Feedback score: N/A
Leave feedback

Rate this member

Report this Post10-04-2021 12:42 AM Click Here to See the Profile for SemperFi18Send a Private Message to SemperFi18Edit/Delete MessageReply w/QuoteDirect Link to This Post
Alright.. I'm getting real close to this rebuild being done. Here's my issue.

Had a wiring issue that I figured out, a wire was getting hot that went to the starter, ended up having the small starter ground hooked up hot.. it was a long day. Fixed that issue.

Now when I hook up the battery, the cab gets power. Dome lights work, door chime.. Everything. Car cranks, I get oil pressure, I can hear oil flowing. But the check engine light does not come on when I turn the key on. Plus the brake light, oil pressure and voltage lights stay on even with the key out... Something is wrong. If anyone has had this issue I would appreciate some help. It's a simple stroker rebuild out of a 86 2M6.

The fuel pump will not prime, fuse is good, reset ECM.. I'm at a dead end
IP: Logged
PFF
System Bot
theogre
Member
Posts: 30171
From: USA
Registered: Mar 99


Feedback score: N/A
Leave feedback





Total ratings: 558
Rate this member

Report this Post10-04-2021 08:53 AM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
F-pump not prime =
Wire(s) for relay or pump has problems.
ECM is "dead" not sending power to turn on relay. Just 1 bad solder joint inside of ECM = dead ECM even if seems to work otherwise.
Relay is bad. Switch FP and AC clutch rellays, same part.

Connect ALDL G to 12v and see if the pump will even start that way...

------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)


The Ogre's Fiero Cave

[This message has been edited by theogre (edited 10-04-2021).]

IP: Logged
TXGOOD
Member
Posts: 5382
From: Austin, Texas
Registered: Feb 2006


Feedback score:    (58)
Leave feedback





Total ratings: 87
Rate this member

Report this Post10-04-2021 02:56 PM Click Here to See the Profile for TXGOODClick Here to visit TXGOOD's HomePageSend a Private Message to TXGOODEdit/Delete MessageReply w/QuoteDirect Link to This Post
Have you checked the 10 amp ECM fuse in #1 ?
I had that problem over the weekend.
I swore I checked that fuse but when I went to look at it as a last resort it was blown.
IP: Logged
SemperFi18
Member
Posts: 58
From: Spokane Valley, WA
Registered: Aug 2016


Feedback score: N/A
Leave feedback

Rate this member

Report this Post10-04-2021 09:58 PM Click Here to See the Profile for SemperFi18Send a Private Message to SemperFi18Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by TXGOOD:

Have you checked the 10 amp ECM fuse in #1 ?
I had that problem over the weekend.
I swore I checked that fuse but when I went to look at it as a last resort it was blown.


Checked the fuse with a meter, all fuses are good. The ECM is failed but I'm concerned hooking up a new one if there's an issue. I didn't do anything to the electrical, but had a ground hooked up hot and it appears the terminal burnt is the ground fire the ECM.

Followed all procedures and I'm getting no SES light or codes. Problem is, my dash indicator lights stay on (brakes,oil,volts) stay on with the key out.. forever. Have to disconnect the battery. I don't see this ****ing car is having so many issues. One little mistake on the starter and it fries the computer? Why are there fusible links and a fuse? I thought those were meant to protect it....
IP: Logged
SemperFi18
Member
Posts: 58
From: Spokane Valley, WA
Registered: Aug 2016


Feedback score: N/A
Leave feedback

Rate this member

Report this Post10-04-2021 11:18 PM Click Here to See the Profile for SemperFi18Send a Private Message to SemperFi18Edit/Delete MessageReply w/QuoteDirect Link to This Post
What's the overall opinion of the best place to buy a plug and play ECM? I'm over it with this car, apparently I'm the only one who's had this issue... So I just gonna start throwing parts at it
IP: Logged
SemperFi18
Member
Posts: 58
From: Spokane Valley, WA
Registered: Aug 2016


Feedback score: N/A
Leave feedback

Rate this member

Report this Post10-04-2021 11:22 PM Click Here to See the Profile for SemperFi18Send a Private Message to SemperFi18Edit/Delete MessageReply w/QuoteDirect Link to This Post

SemperFi18

58 posts
Member since Aug 2016
 
quote
Originally posted by theogre:

F-pump not prime =
Wire(s) for relay or pump has problems.
ECM is "dead" not sending power to turn on relay. Just 1 bad solder joint inside of ECM = dead ECM even if seems to work otherwise.
Relay is bad. Switch FP and AC clutch rellays, same part.

Connect ALDL G to 12v and see if the pump will even start that way...

No fuel when I jump G to 12v, ECM smells like bad electrical.. if I slightly jiggle the connectors I get small sparks. My main concern is the dash lights staying on with the key out. I don't want to plug a new ECM in there and fry that too. I had one electrical short that I fixed. Now this can of worms

I have spark, car fires up briefly when I put gas in the throttle body. No SES light at ALL, and no fuel pump prime. Someone has had to have had this before
IP: Logged
theogre
Member
Posts: 30171
From: USA
Registered: Mar 99


Feedback score: N/A
Leave feedback





Total ratings: 558
Rate this member

Report this Post10-05-2021 08:39 AM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
ALDL G is Direct connect to F-pump.
Power there and pump won't run then pump or wires to it is discon C502 C203, wires cut, pump dead.

All Dash lights On is major problem w/ dash. You can't turn all On even w/ I-key in Bulb Test next to Start.
Seat beat light runs only by the chime unit.
CEL only by ECM
Unless you "Fix" temp light and gauge factory problem, temp light doesn't turn on except sender on engine is hot.

Dash "board" likes to have problems w/ "glue" attaching copper to plastic and glue fails. Then Very easy to short out 1 to many things at big plugs on back.
IP: Logged
SemperFi18
Member
Posts: 58
From: Spokane Valley, WA
Registered: Aug 2016


Feedback score: N/A
Leave feedback

Rate this member

Report this Post10-05-2021 08:16 PM Click Here to See the Profile for SemperFi18Send a Private Message to SemperFi18Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by theogre:

ALDL G is Direct connect to F-pump.
Power there and pump won't run then pump or wires to it is discon C502 C203, wires cut, pump dead.

All Dash lights On is major problem w/ dash. You can't turn all On even w/ I-key in Bulb Test next to Start.
Seat beat light runs only by the chime unit.
CEL only by ECM
Unless you "Fix" temp light and gauge factory problem, temp light doesn't turn on except sender on engine is hot.

Dash "board" likes to have problems w/ "glue" attaching copper to plastic and glue fails. Then Very easy to short out 1 to many things at big plugs on back.


The only lights that are on all the time is the oil light by the guage, the volts light and the brake light. Dome goes off when I shut the door. Not getting full lights on the dash, just those three and no SES ever

IP: Logged
SemperFi18
Member
Posts: 58
From: Spokane Valley, WA
Registered: Aug 2016


Feedback score: N/A
Leave feedback

Rate this member

Report this Post10-05-2021 08:18 PM Click Here to See the Profile for SemperFi18Send a Private Message to SemperFi18Edit/Delete MessageReply w/QuoteDirect Link to This Post

SemperFi18

58 posts
Member since Aug 2016
Unless I pull the dash fuse, then the SES light comes on. So I know it's not the bulb. ECM is fried, but I don't know how. Took it apart and it looks perfect, but the connectors have an electrical smell. ECM was fine before the rebuild, brand new fuel pump that worked before the rebuild
IP: Logged
SemperFi18
Member
Posts: 58
From: Spokane Valley, WA
Registered: Aug 2016


Feedback score: N/A
Leave feedback

Rate this member

Report this Post10-05-2021 09:22 PM Click Here to See the Profile for SemperFi18Send a Private Message to SemperFi18Edit/Delete MessageReply w/QuoteDirect Link to This Post
Okay... So if I eliminate the ECM the dash light issue goes away. Door chime works, still no SES obviously. Headlights and motors work. I think I fried it when I hooked up a small ground wire to hot on the starter. (Even with fuses and fuses disconnects...) I'm just going to get a new ECM and see if it fries that one too.

Where is the best place to buy a plug and play ECM? I'm not sure if my PROM is fried or not, Fiero store you have to use your existing one and I'm not paying their prices. Is RockAutos any good? My junk yard in town sucks so salvage is not an option
IP: Logged
Raydar
Member
Posts: 39039
From: Carrollton GA. Out in the... country.
Registered: Oct 1999


Feedback score:    (12)
Leave feedback





Total ratings: 455
Rate this member

Report this Post10-06-2021 08:31 AM Click Here to See the Profile for RaydarClick Here to Email RaydarSend a Private Message to RaydarEdit/Delete MessageReply w/QuoteDirect Link to This Post
Your car is an 86? Any 86-87-88 Fiero V6 ECM will work. Your PROM should be okay.

You can use an 85 V6 ECM as well, but it will have to have the correct 85 PROM for your trans type. You 86 PROM will not work.
IP: Logged
PFF
System Bot
buddycraigg
Member
Posts: 13413
From: kansas city, mo
Registered: Jul 2002


Feedback score: (5)
Leave feedback





Total ratings: 476
Rate this member

Report this Post10-08-2021 08:46 PM Click Here to See the Profile for buddycraiggClick Here to Email buddycraiggSend a Private Message to buddycraiggEdit/Delete MessageReply w/QuoteDirect Link to This Post
I know you have a engine swap.
so that might be a problem.

Check all of your fuses. On a stock car, having some fuses blown will make things "back flow" current (if that is even a word) and do strange things.
IP: Logged

next newest topic | next oldest topic

All times are ET (US)

Post New Topic  Post A Reply
Hop to:

Contact Us | Back To Main Page

Advertizing on PFF | Fiero Parts Vendors
PFF Merchandise | Fiero Gallery | Ogre's Cave
Real-Time Chat | Fiero Related Auctions on eBay



Copyright (c) 1999, C. Pennock