Misfire, where do i go from here. (Page 11/18)
maryjane FEB 25, 04:22 AM

quote
Originally posted by Patrick:

Maybe I should've asked you how you dug up that image! What led you to that particular Headlight Switch(!) harness which has the same "mystery" capacitor as the one we've been fretting over for the last few days?




Googled the 7 digit GM part # and found a cross reference for it

[This message has been edited by maryjane (edited 02-25-2023).]

Patrick FEB 25, 04:36 AM

quote
Originally posted by maryjane:

Googled the 7 digit GM part # and found a cross reference for it.



I think perhaps I was too fixated on T8349, but even when I now do a search for 1987569, I don't seem to find anything of any relevance. I'm impressed by your google skillz!
82-T/A [At Work] FEB 25, 10:33 AM

quote
Originally posted by Patrick:

"silver bullet"? I have no idea what you're referring to.




Well, "I" believe you, I was just looking for something a bit more concrete like a picture of an original duke engine so I could include it on my page for reference.

I haven't updated my website in a long time... like, a decade really except for two pictures I added. Half the images are broken because I went from a Windows-based hosting to a Linux-based hosting... but I do want to start updating it again.
Patrick FEB 25, 04:50 PM

quote
Originally posted by 82-T/A [At Work]:

I was just looking for something a bit more concrete like a picture of an original duke engine so I could include it on my page for reference.



Well, you can always use the photo I posted Here of my '84 parts car... although it's rather grotty.
Dukesterpro FEB 27, 09:49 AM
Of all the places I was expecting that RF capacitor to show up, a 98 olds headlight switch was not one.

Im going to do some snooping. Thanks again for the info everyone!
ArthurPeale FEB 27, 10:17 AM

quote
Originally posted by Dukesterpro:

I did identify that mystery part a few posts back, it's a radio filter. According to some GM documentation, it is there for cars with older non-pushbutton radios that don't have a filter built into them. Without it, you get a whirring noise in your stereo that revs with the engine. I still want to replace it, but I would like to find someone who has a good one so I can verify its capacitance and source some new ones from digikey. You can guess and over shoot its capacitance but you loose filtering efficiency the more off it is. Too little capacitance and pop go the weasel.





Shoot. My radio works fine, but if I use a Bluetooth transmitter I get that whine. Probably because it's in the cigarette lighter and shares the same circuit.

82-T/A [At Work] FEB 27, 12:01 PM

quote
Originally posted by Patrick:

Well, you can always use the photo I posted Here of my '84 parts car... although it's rather grotty.




Hahah, thank you. I will. I'll probably mentioned that the earliest Fiero was recovered from the Titanic, and was found to have that distributor.
82-T/A [At Work] FEB 27, 12:12 PM

quote
Originally posted by 82-T/A [At Work]:

Dukespro, wish I could help, but honestly... you're missing the condenser... which is important for ensuring a clean signal to the ECM for timing. I used to have a 1984 Fiero Service Manual... I may still have it in storage if you feel like waiting that long. You might be able to find it online too... I just did a quick search and couldn't find it in PDF format. But this is it basically: https://www.themotorbooksto...175c90b69bdbe3d83819





I wanted to bump this again... just because the Pontiac Service Manual (for the 1987 Fiero) arrived at my house this morning. I am blown away... I don't even want to touch it for fear I'll put fingerprints on it. I almost wonder if I should buy another because it's so awesome... and I want one for my bookshelf and one for the garage! hahah...

Anyway, the books are absolutely FANTASTIC. The 87 comes as two books. There are no page numbers because they go by sections, but I'd have to assume that each book is about 700 pages. They are each enormous. It literally covers everything you could conceive of.

I am not sure if they are originals, or if they are reproductions... because the cover and everything is exactly like the originals from what I can see; however, some of the fine print... like the Brake Diagnostics Chart gets a little grainy. It uses some small print which is clear everywhere else, but on a couple of the charts it gets just a tad fuzzy... which leads me to beleive it was a scan. Still, it's 100% legible, and only looks perhaps 10% degraded from everything else in the book which is completely clear and pristine (as if printed directly from text, and not a scan).

The books are fantastic. I may even end up buying one for my 1985 since I just bought another Fiero. If you can swing it... I definitely recommend it. 1984 is the craziest (but one of the coolest) years, in my opinion.


Reposting the link here: https://www.themotorbookstore.com/

I have no affiliation with this company.
Dukesterpro FEB 28, 12:39 AM
Scanner got in. Fired up win ALDL.

My TPS is reporting 1.2V at a fully closed pedal, which seems a bit high. lol. It looks like I got a bad TPS right out of the box. Gonna to find me a good delco unit.


Does anyone know what good O2 Sensor readings should be. Mine seems to bounce around a lot.
Patrick FEB 28, 03:10 AM

quote
Originally posted by Dukesterpro:

My TPS is reporting 1.2V at a fully closed pedal, which seems a bit high. lol. It looks like I got a bad TPS right out of the box. Gonna to find me a good delco unit.



With the presumption that your throttle is closed as far as it should be... try adjusting your TPS. No, don't bend the tang. Watch/listen to the way the fella in this video does it. (Jump to 2:49) He rotates the TPS. If your TPS isn't slotted, break out the Dremel...




In regards to your O2 sensor, the reading is supposed to bounce around... but hopefully someone else can provide further details on its proper operation.

[This message has been edited by Patrick (edited 03-21-2023).]