Spark plug gap size?

Spark plug gap size?

Postby DustySafari [OP] » July 27th 2015, 2:28am

What are the gaps for an Astro? Should they be 0.060" or 0.040" Pulling all the spark plugs were easier than i thought lol
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Re: Spark plug gap size?

Postby chevymaherchevymaher is online! » July 27th 2015, 3:31am

35 on mine. I don' know if the newer models went to 45 or not.
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Re: Spark plug gap size?

Postby Leeann_93 » July 27th 2015, 3:51am

It's on a sticker under your hood.
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Re: Spark plug gap size?

Postby AstroWill » July 27th 2015, 4:25am

My 89 is .035, 95 was .045, and my 03 is .060 IIRC.
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Re: Spark plug gap size?

Postby Astrofarian » July 27th 2015, 5:52am

You're doing a '96? I think EARLIER 2nd Gen 4.3's used a .045" gap ; I believe it changed in 2000 or 2001 but don't quote me on that. All i'm sure of is that my '91 likes .035" gap.
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Re: Spark plug gap size?

Postby Lumpy » July 27th 2015, 6:39pm

Still using those old copper electrode plugs that you have to gap? You have a crank starter on the front as well? 8 track player under the dash?


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Re: Spark plug gap size?

Postby WoodButcher » July 27th 2015, 7:47pm

I'mahatemyselfinthemorning,,,



So Lump,
what do you use?
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Re: Spark plug gap size?

Postby Leeann_93 » July 27th 2015, 9:23pm

I use AC Delco 41-993 which are iridium, no gapping required (or suggested).
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Re: Spark plug gap size?

Postby Lumpy » July 27th 2015, 11:27pm

WoodButcher wrote:I'mahatemyselfinthemorning,,,



So Lump,
what do you use?


4 electrode platinum. No gap required or possible.

I think all platinum and iridium are no-gap.


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Re: Spark plug gap size?

Postby Astrofarian » July 27th 2015, 11:47pm

No 8-tracks for me; Mono 4-track Baby
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Re: Spark plug gap size?

Postby paulo57509 » July 28th 2015, 1:24am

DustySafari wrote:What are the gaps for an Astro? Should they be 0.060" or 0.040" Pulling all the spark plugs were easier than i thought lol


Your owner's manual specifies 0.060" gap.
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Re: Spark plug gap size?

Postby DustySafari [OP] » July 28th 2015, 1:53am

Changed all spark plugs with some NGK 9's.. Boy van instantly fires up! Definitely can feel more power, laying down rubber ain't a problem no more lol.
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Re: Spark plug gap size?

Postby Lumpy » July 28th 2015, 8:38am

I put NGKs in our Honda Accord.

Didn't go any faster or get any better MPGs but it increased the stereo bass response and reset our classic rock stations to hip hop and rap crap.


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Re: Spark plug gap size?

Postby DustySafari [OP] » July 28th 2015, 6:08pm

Ii guess mine had to be changed anyways so maybe that's why it runs better it had Champions, they look fouled anyways
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Re: Spark plug gap size?

Postby DRZ » July 28th 2015, 6:24pm

As a general rule you want the biggest gap the ignition can reliably fire but if you "out gap" the ignition that is worse than a too small gap. When I put the '99 LS1 in my '98 Astro the engine had NGKs in it. I replaced them with ACs cause I thought that would be OEM and then found out GM put NGKs in the LS1s.
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