proper plug, gap and removal
Thread Starter
Racer
Joined: Oct 2005
Posts: 343
Likes: 0
From: San Antonio Tx
proper plug, gap and removal
HI - New to C5's
Have a slight miss at idle. Pulled a plug after a huge struggle getting the boot off. Then to my surprise there was a metal sleeve with a spring on the end of the plug wire..I found a Denso plug at .06 gap. Looked in the manual and thats what it called for. I talked to a parts guys and he said it should come with A/C delco plugs??
Long story short - what is the proper plug, gap, is wire sleeve with spring supposed to be there and is there a trick to getting the boots off easily and plugs out. I would think after todays adventure - it would take 5 or 6 hours just to change plugs.
I've read a lot about Bosch Platuim double fire plugs are they ok, do I need to change wires or any other parts if I put them in? Thx Len
Have a slight miss at idle. Pulled a plug after a huge struggle getting the boot off. Then to my surprise there was a metal sleeve with a spring on the end of the plug wire..I found a Denso plug at .06 gap. Looked in the manual and thats what it called for. I talked to a parts guys and he said it should come with A/C delco plugs??
Long story short - what is the proper plug, gap, is wire sleeve with spring supposed to be there and is there a trick to getting the boots off easily and plugs out. I would think after todays adventure - it would take 5 or 6 hours just to change plugs.
I've read a lot about Bosch Platuim double fire plugs are they ok, do I need to change wires or any other parts if I put them in? Thx Len
Melting Slicks
Joined: Nov 2005
Posts: 2,071
Likes: 0
From: clackamas oregon
the spring is there to help you remove those darn plug wires!!!
just kidding.. they are a pain to remove. takes some twisting while pulling. i broke one on the second wire attempt and had to replace them. most likely if yours are old they have been pulled to replace the plugs and the inside wire is cracked or the ends pulled slightly loose and could cause a miss also. the plugs can last a long long time if they are the platnum type. i am not at home to look up the gap but it seems it was pretty big. delco was what was in mine. i replaced the wires with the msd red wires. they have the same ends that the red factory wires have, seemed strange they would usse the SAME ones name and all. said delco on them. my point being, i dont think they are worth the more money over the gm stk replacements.
most of these have a little miss feel at idle.
usaully wires/plugs cause a miss under load
just kidding.. they are a pain to remove. takes some twisting while pulling. i broke one on the second wire attempt and had to replace them. most likely if yours are old they have been pulled to replace the plugs and the inside wire is cracked or the ends pulled slightly loose and could cause a miss also. the plugs can last a long long time if they are the platnum type. i am not at home to look up the gap but it seems it was pretty big. delco was what was in mine. i replaced the wires with the msd red wires. they have the same ends that the red factory wires have, seemed strange they would usse the SAME ones name and all. said delco on them. my point being, i dont think they are worth the more money over the gm stk replacements.
most of these have a little miss feel at idle.
usaully wires/plugs cause a miss under load
Last edited by rgtkst; Sep 24, 2006 at 07:48 PM.
Drifting
Joined: Feb 2003
Posts: 1,761
Likes: 235
From: North Carolina
Your stock plug info is:
AC Delco Iridium 41-985 Gap = .040
You will find different plug gaps for other manufacturers, but .040 is for the 41-985 Delco's
Below is a link to the tech tips section on plug replacement.
https://www.corvetteforum.com/techti...ID=7&TopicID=1
MAC
AC Delco Iridium 41-985 Gap = .040
You will find different plug gaps for other manufacturers, but .040 is for the 41-985 Delco's
Below is a link to the tech tips section on plug replacement.
https://www.corvetteforum.com/techti...ID=7&TopicID=1
MAC
Last edited by MAC5; Sep 24, 2006 at 08:21 PM.
Instructor
Joined: Jun 2006
Posts: 222
Likes: 1
From: Rapid City SD
Originally Posted by MAC5
Your stock plug info is:
AC Delco Iridium 41-985 Gap = .040
Below is a link to the tech tips section on plug replacement.
https://www.corvetteforum.com/techti...ID=7&TopicID=1
MAC
AC Delco Iridium 41-985 Gap = .040
Below is a link to the tech tips section on plug replacement.
https://www.corvetteforum.com/techti...ID=7&TopicID=1
MAC
Drifting
Joined: Feb 2003
Posts: 1,761
Likes: 235
From: North Carolina
Originally Posted by mfrejek
if I'm not mistaken, no gapping is required on these plugs, they are pre-gapped.
You are correct, the Delco's are pre gapped. I'm just from the old school that checks them for the hell of it. Never know when someone dropped one on the work bench after looking at it.
Instructor
Joined: Jun 2006
Posts: 222
Likes: 1
From: Rapid City SD
Originally Posted by MAC5
You are correct, the Delco's are pre gapped. I'm just from the old school that checks them for the hell of it. Never know when someone dropped one on the work bench after looking at it.
