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werdstrave
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Name : Drew
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PostSubject: Re: misfire   Mon Mar 24, 2014 12:54 pm

I guess further more, does anyone know if the OEM coils go on both SC 3800s and naturally aspirated 3800s? Wondering if GM made 2 different kinds.
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werdstrave
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PostSubject: Re: misfire   Tue Mar 25, 2014 4:48 pm

Didn't hear back from anyone...ordered the Delco Coil D555 GM 10472401 OEM Factory Part. Hopefully the resistance is back around the 5.6 ohms...
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LARRY70GS
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PostSubject: Re: misfire   Tue Mar 25, 2014 6:37 pm

I just looked up a 98 Riviera SC3800 on Rockauto, and these are the Delco coils, E530C, and D576, and Standard Motor products DR39.

The 96 Riviera N/A 3800 lists the same Delco E530C, D555, and Standard Motor Products DR39.

There may not be a difference.

_________________
98 Riviera SC3800  All stock except gutted air box.
1970 Buick GS455 Stage1, TSP built 470BBB, 602HP/589TQ
Best MPH, 116.06 MPH, Best ET, 11.54
https://www.youtube.com/watch?v=UHCda-t_Jls
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Last edited by LARRY70GS on Tue Mar 25, 2014 8:34 pm; edited 1 time in total
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werdstrave
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PostSubject: Re: misfire   Tue Mar 25, 2014 7:18 pm

Cool thanks for checking. I just hope they're at 5.6 ohms. Kinda sucks they don't say it in the item description.
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werdstrave
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PostSubject: Re: misfire   Sun Mar 30, 2014 5:31 pm

Boom! 5.6 ohms on the delcos. An exact fit!
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albertj
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PostSubject: Re: misfire   Sun Mar 30, 2014 8:28 pm

werdstrave wrote:
Boom! 5.6 ohms on the delcos. An exact fit!

I apologize for missing responding a while back.

You did the right thing, measure the coil resistance with a meter to make sure they match and are in fact the SC coils.

As for your original question, I would get junkyard coils from a pick-n-pull before I bought the AZ coils for this application.

oh by the way while you are in there, clean the metal ground plate for the ignition module and check the wiring harness to the module, at the connectors, for weak wires at the crimps... if the copper work-hardens over time for whatever reason then the wires can snap inside the insulation.

Albertj
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PostSubject: Re: misfire   Sun Mar 30, 2014 8:41 pm

werdstrave wrote:
I guess further more, does anyone know if the OEM coils go on both SC 3800s and naturally aspirated 3800s? Wondering if GM made 2 different kinds.

Specifically to this point, GM used a different coil for the SC3800 and the NA 3800. BOTH coils physically interchange, but you can tell the diff just by measuring the resistance with a meter (not by looking at the coil).
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werdstrave
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PostSubject: Re: misfire   Wed Jul 30, 2014 2:25 am

Hey guys,

Long story short, I seem to be having this problem again (surging, lack of power, rough/high idle at stop). I'd like to test my coils to see if another one went bad. Is it possible to determine if one is bad by just checking the resistance across the posts of a coil? Or do I have to do this spark check described here with an HEI spark tester: http://easyautodiagnostics.com/gm/3.8L/ignition-coil-pack-tests-3

Basically, will 5.6 ohms across the posts mean I have a good coil, and infinite resistance mean I have a dead coil?
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werdstrave
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PostSubject: Re: misfire   Wed Jul 30, 2014 2:28 am

Also...I have a P0122 code: TPS signal low. I don't think I have any problem with my TPS but will confirm this in the morning. Could this code be thrown by a bad coil pack?
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Abaddon
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PostSubject: Re: misfire   Wed Jul 30, 2014 8:33 am

werdstrave wrote:
Also...I have a P0122 code: TPS signal low. I don't think I have any problem with my TPS but will confirm this in the morning. Could this code be thrown by a bad coil pack?

When did this P0122 appear? A bad TPS will absolutely cause misfires and horrible running conditions.....
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werdstrave
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PostSubject: Re: misfire   Wed Jul 30, 2014 12:10 pm

The code appeared and then a few engine start ups later the car started choking and misfiring. I'm going to check the electrical integrity of the sensor now using: http://easyautodiagnostics.com/gm/3.8L/how-to-test-the-throttle-position-sensor-4
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deekster_caddy
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PostSubject: Re: misfire   Wed Jul 30, 2014 2:00 pm

Check all the grounds!
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werdstrave
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PostSubject: Re: misfire   Wed Jul 30, 2014 2:12 pm

Just ordered a new Delco TPS. Should be here tomorrow. I tested the middle circuit and voltage was hovering around .5 V and would not climb to 5 V when I depressed the gas pedal as the link above said it should do. I also unplugged the harness to the TPS and the engine ran very similar as when it was plugged into the TPS. Voltage to the TPS was checked and was solid. I hope this fixes my problem. Will report back.
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