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2001 eldorado,2008 DTS,2005 XLR, '96 eldo,'95 eldo,' 89 eldo,'78 eldo,'11CTS-V
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Discussion Starter #1
This question has to do with what spark plug should I use in my '97 Y motor.

I've got a random miss that I think is spark plug 'issues'. I've glass beaded the ones in the block ( original Delco; business end looked good prior to blasting), reinstalled and vehicle ran fine for about three days; now the miss is back. Oh, plug wires ohmed out ok.
Now I'm convinced the plugs are bad, but what should I put in?
The manual calls for a 41-9000 (delco)
I've got some R45LTS6 and R44LTS6's sitting on the shelf. They look like Northstar plugs.
I also have some TR55 NGK's; they too look like Northstars.
What plug do you wise folks recommend.
 

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98 eldo/KD54 w/N37,T96,QA1,D55,DS3,U1Z. U3R next
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2,125 Posts
Re: spark plugs

Delco's or Denso.......that's my northstar preference and never had issues with them.

I know you ohm tested the wires, but how old are they? They could still be possible culprits....
 

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2002.5 F55 CORSA STS, 2014 Explorer XLT FWD
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68,507 Posts
Re: spark plugs

AC Delco #41-950 Professional Platinum or the identical cross-reference DENSO plug - same item.

Makes no difference if the plug wire resistance looks "OK". A tiny crack in the insulation or a boot can cause all sorts of problems. If the wires are more than 5 - 6 years old, change them too.

There is no "AC Delco 41-9000" spark plug that I could find.

Make very sure that you connect the coils > plugs as shown. Also, check the ICM ground cable to the engine and clean the coil mounting bases - remove the coil pack and dismount and clean everything.
 

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Master of the Dark Art of Diagnostics
2003 DHS - two-2002 DHS, 2003 SLS, 1995 Sedan DeVille, 1989 Coupe DeVille
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19,286 Posts
Re: spark plugs

This question has to do with what spark plug should I use in my '97 Y motor.

I've got a random miss that I think is spark plug 'issues'. I've glass beaded the ones in the block ( original Delco; business end looked good prior to blasting), reinstalled and vehicle ran fine for about three days; now the miss is back. Oh, plug wires ohmed out ok.
Now I'm convinced the plugs are bad, but what should I put in?
The manual calls for a 41-9000 (delco)
I've got some R45LTS6 and R44LTS6's sitting on the shelf. They look like Northstar plugs.
I also have some TR55 NGK's; they too look like Northstars.
What plug do you wise folks recommend.
==========================
I've got a random miss that I think is spark plug 'issues'.
are you getting the P0300 code?

if yes - use a hand-held scanner -
and get the specific cylinder # misfiring -
P0301 is #1 - P0302 is #2 - etc -

could be plug - could be wire - could be coil -

glass beading might have destroyed the plugs -
by knocking the platinum coating off -

stick with the ACDelco 41-950 -
 
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