84 Duke Auto to Manual Swap EPROM Concern (Page 1/3)
Derekw66 MAY 22, 12:09 PM
Hey guys, I'm still having idle and throttle response issues and I am still running the auto trans computer since my donor manual computer won't even start the car. What can I do to reflash the eprom to a manual (specifically, like where to get the program and what sort of software and cable) or should I just find another computer? Thank in advance.
82-T/A [At Work] MAY 23, 09:59 AM

quote
Originally posted by Derekw66:

Hey guys, I'm still having idle and throttle response issues and I am still running the auto trans computer since my donor manual computer won't even start the car. What can I do to reflash the eprom to a manual (specifically, like where to get the program and what sort of software and cable) or should I just find another computer? Thank in advance.



Hi Derek, I don't think the ECM is really your problem (though that ECM might just be dead). I think there should be some other issue related to your idle / throttle response issues. Do you have a link to where you posted the issues you're having? I can't remember seeing it. Otherwise, can you post them in here?

FYI, I MAY have a spare 84 / 4-Speed ECM and chip. I was just at my storage unit a couple of weeks ago, and had a stack of ECMs that I'd apparently collected. I wrote what each of them were for on the front, so if you have no other options, then I'll look and see if I have one and you can have it for the cost of shipping.
Derekw66 MAY 23, 04:40 PM
82 T/A I would love to have a 4 speed ecm. I'm not sure why the 86 ecm from my donor car wouldn't even fire the engine but I know 84 was a special year for a lot of little differences from all of the other years. Let me know how you want me to pay for shipping an i'll gladly take it off your hands. I''ve done a full engine rebuild going .030 over bore with aluminum pistons as well as a lightened cam gear. I'm still running the original injector but have a new TPS and AIC valve set to the correct depth. I've reset said IAC as per the book and driven it several miles above the 40 or 45mph threshold. Timing has been set and reset and it still wants to hunt for idle from 300-1500 as well as bucking under acceleration. Any attempt at acceleration from idle to 3k is a struggle. Also, no vacuum leaks detected. I'd like to cross the ecm off of potential culprits. It's my sons car and he's anxious to drive it since he's back from college, can't blame him, I've dragged my feet on this thing for nearly 18 months. lol
82-T/A [At Work] MAY 23, 05:22 PM

quote
Originally posted by Derekw66:

82 T/A I would love to have a 4 speed ecm. I'm not sure why the 86 ecm from my donor car wouldn't even fire the engine but I know 84 was a special year for a lot of little differences from all of the other years. Let me know how you want me to pay for shipping an i'll gladly take it off your hands. I''ve done a full engine rebuild going .030 over bore with aluminum pistons as well as a lightened cam gear. I'm still running the original injector but have a new TPS and AIC valve set to the correct depth. I've reset said IAC as per the book and driven it several miles above the 40 or 45mph threshold. Timing has been set and reset and it still wants to hunt for idle from 300-1500 as well as bucking under acceleration. Any attempt at acceleration from idle to 3k is a struggle. Also, no vacuum leaks detected. I'd like to cross the ecm off of potential culprits. It's my sons car and he's anxious to drive it since he's back from college, can't blame him, I've dragged my feet on this thing for nearly 18 months. lol



Easiest thing (because I'm lazy) is you send me an empty box with a shipping label on it! Haha... only problem is, that it's in the storage unit, which is a good 4 hours away. I likely won't be back to the storage unit for a couple of weeks. But I'll double check to make sure I don't have it at home. If I indeed have it, it's yours.
Derekw66 MAY 23, 05:39 PM
I get it, I enjoy doing nothing when it's "at all possible!) if you like, PM me your address and I'll get you a box.
Derekw66 JUN 14, 04:55 PM
Any chance you have the ECM laying around yet?
82-T/A [At Work] JUN 14, 06:21 PM

quote
Originally posted by Derekw66:

Any chance you have the ECM laying around yet?



I'm hoping to go up this weekend (Sunday) and I'll let you know. Everything is in my storage unit.
Derekw66 JUL 11, 09:03 AM
Any chance you made it up to your storage unit yet?
Dennis LaGrua JUL 11, 10:46 AM
The Fiero ECM's run almost the identical program, except that the auto version provides a signal for the TC lock up and the manual version provides a signal for the shift light. This is as close to plug and play as you can get. The software can be changed in the eprom (chip) but the change wont effect engine operation. As for your problem; it could be the ECM (they can go bad) or a number of other issues, most common would be spark or a vacuum leak. Have you checked for spark and/or a vacuum leak? Could be other things like a clogged fuel filter, low fuel pressure or dirty injector. You will need to do the checks to find the problem but I would focus on spark first.

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Derekw66 JUL 11, 08:13 PM

Yeah, I’ve done all of the things I can think of except for turning the dreaded screw on the side of the throttle body. The engine was fully rebuilt with a .030 bore and aluminum pistons, new vacuum hoses of course, new injector and timing checked and rechecked. Even before the engine rebuild and auto/manual swap, it idled like crap. It has gotten worse though. Aside from sourcing a slightly richer injector from another vehicle, I’m out of options. I’ve also done the IAC valve procedure a few times knowing 84 is alone in many of the seemingly interchangeable parts. Getting a known good ecm from a manual seems like a logical next step to get this thing idling normal. It’s basically undriveable at this point with it’s bucking and slow to no throttle response until I get the revs up to 3k or so. TPS is only about a year old so I have no reason to think this is bad although I may have to revisit it if something doesn’t give up it’s secret soon.