Which Delco ICM for a Formula - d1943a or d1984a? Thoughts on TFS distributors? (Page 2/3)
theogre JUL 20, 07:34 PM
"Thoughts on TFS distributors?"

Get parts from Real Stores w/ a Warranty you don't have to ship defect parts etc.
AZ and others can order Online to get whatever discounts and free shipping then return cores and other returns to local store.
AZ and some others track warranty by phone no and go to any store not just same store you got a part at. (Unlike Pepboys before they close stores to only service cars.)

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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

fierogt28 JUL 21, 01:02 AM
Get a new AC Delco magnet pole from RockAuto. At the same time but a new ICM D1943A, plus distributor cap,rotor and pick up coil.
See how the car runs. Get all AC Delco parts.
You can clean the 6 pole terminals with sandpaper.
As a perfectionist, I would buy new spark plugs and good set of wires for extra durability and reliability.

All these parts you can get at RockAuto.

Hope this helps.

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fierogt28

88 GT, Loaded, 5-speed.
88 GT, 5-speed. Beechwood interior, All original.

echocharliepapa JUL 21, 12:15 PM

quote
Originally posted by fierogt28:

Get a new AC Delco magnet pole from RockAuto. At the same time but a new ICM D1943A, plus distributor cap,rotor and pick up coil.
See how the car runs. Get all AC Delco parts.
You can clean the 6 pole terminals with sandpaper.
As a perfectionist, I would buy new spark plugs and good set of wires for extra durability and reliability.

All these parts you can get at RockAuto.

Hope this helps.





What do you mean by magnet pole? I am not seeing anything by that name on RockAuto. The closest I can think is what's listed as the "distributor shaft": https://www.rockauto.com/en...60&jsn=2460&jsn=2460
fierogt28 JUL 22, 01:16 PM

quote
Originally posted by echocharliepapa:


What do you mean by magnet pole? I am not seeing anything by that name on RockAuto. The closest I can think is what's listed as the "distributor shaft": https://www.rockauto.com/en...60&jsn=2460&jsn=2460



Yes, exactly.
echocharliepapa JUL 22, 02:30 PM
I went out and checked the magnet, it is not cracked that was just some rusty crud and shadows on the photo I took before. So in that case, I probably shouldn't need a new magnet pole/shaft, yeah? I am thinking I am probably going to need to replace the pickup coil still though, it looks pretty corroded all the way around. I'll try to clean things up with an old toothbrush and some compressed air first and see how we're looking then, because I'd definitely rather not remove the whole distributor assembly from the car if at all possible.
ArthurPeale JUL 23, 02:44 PM
Removing the distributor isn't difficult, and most work you're going to do to the existing will be easier if it's out.

I'd still recommend replacing the original assembly.
echocharliepapa JUL 26, 12:51 PM
First, I appreciate all y'all's input. After consideration of everything you guys said and taking a closer look at the condition of what I currently have in the car, I ordered a new ICM (D1943A), pickup coil, cap, rotor, and spark plugs and wires for good measure. Ordered from RockAuto because they had AC Delco parts in stock for everything but the wireset and their prices are far better than what I can get for mostly aftermarket options at local brick-and-mortar shops. Should be arriving in a couple more days, I'll update the thread with results when I get the new parts in the car. Considered just doing a drop-in replacement but I'd rather keep the OEM style distributor for now, although I may order one of those Cardone units later to keep in the garage as a backup.
FormulaGT SEP 12, 08:12 PM
Back to the ORIGINAL question of this post. Bumping this because I have an AC Delco D1984A ready to install on my '88 GT. I too see that there are 2 different options listed for the Fiero in the AC Delco brand and bought the more expensive one just because it was not that much more. Anyway, is there a known difference other than cost to the compatibility or durability? Thanks!
css9450 SEP 14, 11:34 AM

quote
Originally posted by FormulaGT:

Back to the ORIGINAL question of this post. Bumping this because I have an AC Delco D1984A ready to install on my '88 GT. I too see that there are 2 different options listed for the Fiero in the AC Delco brand and bought the more expensive one just because it was not that much more. Anyway, is there a known difference other than cost to the compatibility or durability? Thanks!



I'll be the other side of the coin in your experiment..... I just installed a D1943A in my 88GT.

So far, so good! Car runs great. I have no idea what the difference between the two modules might be.

echocharliepapa OCT 08, 06:03 PM
Late bump, but I thought I should follow up with what happened. Parts arrived from RockAuto, took the distributor out to replace the pickup coil and found the shaft did not want to come out of the rest of it (may have seized up from corrosion or I may have bent it trying to tap out the retaining pin). Decided to just order one of the complete Cardone distributors. RockAuto site was bugging and wouldn't process the order or bring me to a confirmation page, just kept returning the browser to the (full) shopping cart. Originally may have had an issue with the billing address for the card, but cleared that up with the bank and it still wouldn't go through. So I ordered the parts from Summit instead, where actually the total was cheaper and shipping was faster. Not half an hour later I get a confirmation email from RockAuto. Go to the site to cancel the order and the part is already "processing" for shipment, can't stop it (even though it doesn't ship for another day).

A few days later, the Summit shipment arrives, I swap out the distributor and it starts right up, running okay. Need to get a flex-head ratchet to tighten the bottom bolt all the way, but it's in and running. Learned my lesson on why RockAuto is so cheap, I know some of you warned me but I guess I had to find out for myself. Customer service is practically non-existent, consists solely of an automated system on the site where you select your issue from drop down menus and none of the options pertain to my problem (the order was processed even though the site did what it said would happen if it was NOT processed, which was return me to the shopping cart page). No customer service address to email, no representatives to talk to on the phone. Too fed up with the experience to bother with a return, so I guess I've got a backup distributor assembly in the garage in case I need it later.

Now I just need to fine-tune the timing, replace the plugs and wires, figure out what's going on with the transmission (started being loud out of gear and the clutch pedal needs to be floored instead of finding the sweet spot like I had to before), and probably half a dozen other things before I can justify moving on to cosmetic fixes.