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Sutty

Spark Plugs in Chevy?

17 posts in this topic

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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My uncle is a master mechanic and I had him order new plugs, wires, cap, and rotor for my GM pickup and he also said go with ac delco. Are you doing wires as well?

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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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I've run AC Truck Plugs for more about 10 years in an 88 Silverado. I think there was a noticable difference when I switched.

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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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When I did the plugs I also did the Cap, Rotor, and Wires. They were not OEM though I put in the expensive option at the parts store whatever that was....

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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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Quote:

The plugs (Delco part # 41-993) don't have a suggested retail price.


Dan, doesn't the 98 model 5.7 use the 41-932?

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I just looked again. Thought I gave out some bum info.

Platinums for a '97-'98 5.7 engine code R says #41-993. I dunno? Just what the GM parts catalog says. And we all know that can be wrong. blush.gif

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In addition to the AC plugs, he also insisted on the spendier wires - I'm not sure if they are AC or not, I would assume so. I got them at his cost: plugs, wires, cap, and rotor for $82.

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I'll swap the plugs and than see if the wires are bad. I appreciate the numbers etc.

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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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A lot of newer plugs, esp. the new AC Delco iridium ones are made by NGK, and just rebadged to AC's. Some of them still say NGK, with the AC Delco logo.

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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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I had a misfire on #7 on my 1996. Did the full tune up and it still did it. It ended up being a bad fuel injector.

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Mac I'll shoot ya an e tomorrow. smile.gif

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Bad Poppets, Yeah!

A/C delco's in GM's

Autolites for Ford's

Champions in Chrysler's

Bosch in German's NOT Ford, Chevy, and Chryslers especially the plus 4's!!!!

NGK in the Japanese brands

Stick to the O.E. and you'll be in good shape!

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