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· Registered
04 XLR, 98 DeVille, 63 Coupe De Ville
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138 Posts
Discussion Starter · #1 ·
Hi folks,

after sitting for about 3 months during winter I startet my 04 diva yesterday
and ... rough idling. Looks like misfires I thought and plugged in the Tech2.

And yes, but only P0300, no specific cylinder and strange U0101 / U1024 codes
about losing communication to TCM.
I'm wondering why no specific cylinder is marked.

As these are still original spark plugs and coils (30k miles) I thought I would put in new ones first of all.

What was your experience? Go ACDelco or better NGK, Bosch etc?

Thanks,
Sammy
 

· Administrator
2002 F55 STS, 2014 Explorer XLT, F-150
Joined
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79,949 Posts
I would recommend using the original AC Delco/DENSO double platinum plugs and original AC Delco/UltraPower/DELPHI coils.

www.rockauto.com

Use a smear of silicone dielectric ignition grease in each plug boot.
 

· Administrator
2002 F55 STS, 2014 Explorer XLT, F-150
Joined
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79,949 Posts
"AC Delco" sources rebranded parts from all over the world and now manufactures very few OEM parts. DELPHI, DENSO, UltraPower, Airtex, Robert Bosch, Siemens, NGK, hundreds of others are all GM OEM parts suppliers and their products may be branded "AC Delco".

Look at the boxes for many "AC Delco" spark plugs - Made in Japan.

DELPHI is/was/may be a huge development and parts division of FM. AC stands for Albert Champion and DELCO was Dayton Engineering Laboratories COmpany.

Here's an "AC Delco" fuel pressure regulator made by Bosch in Germany. Zoom in -

Automotive tire Wood Audio equipment Gas Flooring
 
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