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Spark Plugs in Chevy?

Sutty

Asked by Sutty,

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Sutty Mentor

Sutty

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I have had some issues in my truck (posted some on here for help) Anyway I had a mechanic tell me I should consider changing my spark plugs. He said I should run AC Delco's in GM products and Autolites in Fords. I did a tune up a while back probably two summers ago and put in Autolite double platinums. Anyway I was just wondering if you guys had an opinion on certain brands for certain trucks. I was thinking about switching to NGK's next (heard increases fuel mileage). I have a misfire on number 5 every once in a while so I am going to switch out plugs just to rule that out at least before Airjer starts talking to me about something alien like a fuel injector poppins grin.gif

I suppose I should add its in a 98 GMC K-1500 5.7

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BoxMN Grand Master

BoxMN

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Have same truck. When I had some work done by my mechanic he put AC plugs in and took out the ngk that i had installed, He said they were horrible for the engine, and that I would see better mileage and performance, which I think i sort of did. Also new plug wires after 130k... that is what i brought it in for, just not running good, and it was the wires, but he said never use ngk... for what that is worth.

Now 155k and running like new.

-ps, I could not believe how much the wires were, like $100+... I have beers with these guys, and they are honest and usually trying to save me money by telling what I can and can't do myself, so I trust them. They said the spendy wires are worth it.

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Dan Thiem Mentor

Dan Thiem

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It has been said here already but I'll say it again. O.E.M. parts is almost always the way to go. For your truck Delco wires (part# 718Q) have a suggested retail price of $160.91, so ya, they are pretty spendy. Get someone who buys whsle and have them get 'em. Save some money.

The plugs (Delco part # 41-993) don't have a suggested retail price. But you can expect to spend up to 10 bucks a piece for them babies.

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Fishbreath1 Contributor

Fishbreath1

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It's always hard to tell after a tune up whether or not the new parts perform better than the old ones did when they were new. Using a Chilton's, I checked some plug wires one time to see if I needed to replace them because they are expensive, and I was looking at cheap ones. I used a multi-meter to test resistance and found they were all within specifications. I put a little grease on the contact points, replaced the sparkplugs (using mnfg. recommendations) and the hesitation stopped (I also timed the ignition). So I guess what I'm saying is, test the components if you can (if you or a friend has a mult-meter). If they're in-spec., no need to replace, save some $$$.

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anyfishwilldo Proficient

anyfishwilldo

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If you changed plugs with platnums 2 y/a, and you are only missing on #5, I would be leaning more toward the wires. Examine the #5 wire close, and another trick is to open the hood after dark, and spray down the wires with water(squirt bottle, not hose) and look for the fireworks.

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Macgyver55 Grand Master

Macgyver55

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Dan, I don't mean to hijack the thread but I just searched the AC/Delco site and came up with the same number as you did. I'm really puzzled now because I've literally changed hundreds upon hundreds of these plugs and when removing them they were always 41-932 so thats what I have always been putting back in. I also did a search on the 41-932 to see what it fits and it doesn't list anything. This got my curiosity up so I went out and checked my 97 and sure enough it has the 41-932. Was there and update or a number change I should know about?

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