hello, I finally solved my code44 after a year or so, drove about 80 or so miles and the car ran great like it did before, when I started the fiero after about an hr later it ran very rough and i drove home, i found a blown fuse 5amp, when i put in a new fuse the fiero ran fine but blew the fuse again within seconds, what can cause this issue, can i have a bad injector (i just replaced the injectors) is there any other part that i can replace myself, i also replaced the ecm/egr solenoid and many other parts to solve my code44, i don't want to bring the fiero back to the gm dealer as they charge $90 per hr, the car sits in the garage all the time covered and when i replaced all the parts i took extra care in doing the job, not sure what else to do, this last year has been a big headache with my fiero, wife says get rid of the fiero, but i like my fiero a lot, please any ideas, i read all the post on blowing fuses and i am not sure what to do next, thanks peter
hey gal757, thanks for fast reply, i read that post, i need to purchase some more 5amp fuses and start messing with the fiero, i just hope its something simple, can an injector cause a short and blow the 5amp fuse, ok thanks for your
hello, I was able to get more 5amp fuses, this is what I found out, I stuck the new fuse in, started the car and she ran fine, I turned it off and on a few times and everything worked fine, I got the car up to temperature 220 or so, and she ran fine, I also disconnected the egr selonoid and she ran fine, after letting her sit for 10-15min shut off, I came back to start her and the fuse blew, so I only blow a fuse after I turn her off and let her sit for a few min, and when I start the engine she blows the fuse, not sure what to check next, what could cause this,....
...I had the egr solenoid unplugged and it blew the fuse when I started it again, I looked at all wires, moved them around while the car ran and nothing happened, I only blows the fuse after it sits for few minutes after turning the engine off, just puzzled with this car, ran fine for all these years...
...its the one that's on the back side facing the trunk, she starts up nice runs great, but when I turn her off and wait some time to restart that's when it blows the fuse, I wish the fuse would blow immediately but it does not, I can drive the car, turn off the engine and restart immediately and the fuse does not blow...only when left for a few minutes...
When I experienced an episode of a spontaneous blown fuel injector fuse it turned out to be a bad ECM. Another member who had a similar problem a few months ago confirmed the same sequence of events before identifying the ECM as the problem (my ECM eventually burned up about a week later, no trouble with the replacement).
The first suspect would be a short and for that I'd start at the injector harness at the rail for any visible grounding points. It's been a long time since I've looked at the wiring diagram but there shouldn't be much else if anything tied into the injector power feed. I'd expect a ground to repeatedly blow the fuse when replaced and if intermittent you should be able to repeat the failure by shaking the harness near the engine while it's running since that's the only harness movement point which could cause an intermittent ground.
Added note;
I see you replaced the ECM but I'm not sure if it was to address this problem or the code 44 so the ECM may still be at fault. Again I have not looked at the wiring diagram in years and am throwing out possibilities. This does not sound like a stereotypical intermittent ground as it does not occur while the motor is running. You've replaced the injectors ruling them out as the cause. The ECM gets pretty hot while in use and there maybe an intermittent internal ground causing your problem much the same way as a bad starter that only malfunctions when it is hot. The only other suspect is an ignition switch malfunction if that's possible and maybe the fuse block under the dash if you are running additional accessories and over heating an area of it affecting the fuses. I have overloaded the fuse block before resulting in a small amount of melting over time before realizing it. Swing it down by pressing the release tabs and have a look.
[This message has been edited by Joseph Upson (edited 01-17-2016).]
on a 2.8 I had this issue 20 years ago. Turns out the harness between the engine and firewall had come loose and a fuel injection wire shorted on the exhaust manifold heat shield. check harness in this area.
------------------ 84/87 NB, 3800SC, E-85, VS Cam, 2.8 Pulley, 4T65E-HD, HP Tuners, AEM Wideband, Regal GS Gauges, S-10 Brake Booster. 1/4 mile -11.85 at 114mph
...its the one that's on the back side facing the trunk, she starts up nice runs great, but when I turn her off and wait some time to restart that's when it blows the fuse, I wish the fuse would blow immediately but it does not, I can drive the car, turn off the engine and restart immediately and the fuse does not blow...only when left for a few minutes...
quote
Originally posted by buddycraigg: I've seen the wire harness going to the oil pressure sending unit be rubbed on by the alternator. .
but let me ask you again, in the fuse box, is it #1 or #2?
The pattern he is describing is consistently uncharacteristic of a contact short. If it was due to contact on startup the time factor would be irrelevant and that makes this pretty strange and unusual.
hello, I ended up getting more 5amp fuses and I also got a used ecm just to make sure, the results are the same it blows the fuse after running for a bit, then when I install a new fuse the car runs nice then it runs rough and the fuse blows,....I am going to install my old injectors and see what happens, can there be a short in the injector?, I looked at all wires and found nothing, sunday I might have time to swap out injectors, any more ideas please, she is becoming a pain....
hello, I finally solved my code44 after a year or so, drove about 80 or so miles and the car ran great like it did before, when I started the fiero after about an hr later it ran very rough and i drove home, i found a blown fuse 5amp, when i put in a new fuse the fiero ran fine but blew the fuse again within seconds, what can cause this issue, can i have a bad injector (i just replaced the injectors)
What kind of replacement injectors did you use? Your description about the symptoms changed a little bit to the motor running rough associated with the fuse failing rather than shutting it off and starting back up and finding the problem if I read it correctly.
There are two types of injectors used in early model cars like ours; peak hold and saturated. The fiero uses saturated ~12 ohm injectors. If you have mistakenly installed peak hold injectors that would explain your fuse blowing problem as they have ~2.5 ohms of resistance and would be liking to a short to ground of your fuel injector driver circuit definitely overloading your 5A fuse.
...I got rebuilt injectors, they did look different then the originals, the original injectors look all plastic and are all black, the rebuilt injectors look black at the top but have a chrome bottom, I will reinstall the old original injectors maybe today and post my results, thank you guys again for all the suggestions...I just want her to run all nice...
....well, I installed my old original injectors and she is running fine, no more blowing 5amp fuse, as for the rebuilt injectors one of them looked like it had a short, I used my meter to test them and one of them had a different reading, I hope I will have no more issues with my sweet fiero....thanks for all the help, good day peter......oh, wife says sell that impractical car and get something the whole family can use....
