spark plug gap

malibu36 04-13-2005, 5:48 PM

i have an '00 malibu sunsetter with the monsoon. what should the gap be on the plugs?

(norcalmalibu) · (norcalmalibu) **Join Date: Jun 2004** 04-13-2005, 6:15 PM

whats the plug number and I can check for you tomorrow at work.

(swab791) · (swab791) **Join Date: Mar 2005** 04-13-2005, 6:51 PM

AUTOLITE 103's Gap at 60

malibu36 04-14-2005, 6:21 AM

they are ac plugs- mr43lts

(richd) · (richd) **Join Date: Oct 2003** 04-14-2005, 6:42 AM

The gap should be the same for any brand of plug.

(fogey) · (fogey) **Join Date: Mar 2002** 04-14-2005, 9:18 AM

I just replaced the original MR43LTS's in my Indmar, and the gap was .060". They appear to be platinum, and the engine only has 325 hours, so I figure this was the factory gap. I gapped the new plugs at .060", and it runs fine.

(peter_c) · (peter_c) **Join Date: Sep 2001** 04-14-2005, 1:12 PM

You can not gap platinum plugs in the normal sense as it destroys them. In fact the gap should be preset, and not need adjustment.

(norcalmalibu) · (norcalmalibu) **Join Date: Jun 2004** 04-15-2005, 1:56 PM

Yes they should be pre gapped but many of them are still off. Its always good to double check.

malibu36 04-18-2005, 1:30 PM

i called indmar and it is 45

(melvinator) · (melvinator) **Join Date: Apr 2001** 04-20-2005, 9:28 AM

malibu36 is correct, I have a 96 vlx with the 320 monsoon and the book says 45.

(mitchm) · (mitchm) **Join Date: Sep 2002** 04-20-2005, 10:42 AM

All good info above!
This is a PM I got on another msg board from a guy at Indmar. FWIW- I also run the MR43LTS gapped at 45

----When we use standard plugs, like the MR43LTS, we gap them at .045", when we use platinum plugs in a 5.7L, (AC 41-932) we gap them at .060". According to a crossreference I found on the internet, the Autolite 103 is a standard plug that is supposed to be equivalent to the MR43LTS, I would gap that plug at .045" -----