Spark Plugs

phat97yukon · November 28, 2005

Ngk Iridiums, ive just put in my 2nd set of the NGK's in just over a year, put 50K on the first set, and they still looked great, i was just stupid one day and wasnt thinkin, and ended up gappin them... i think i drank a lil too much the night before.. needless to say, gapin em killed em very very quick. so tossed in a new set and it runs as good as new.....

alvocado · November 29, 2005

I'm starting to get some minor rough idle when at a stop. The RPM doesn't jump but I can feel the idle bouncing. My Yukon Denali has 57k miles with the original plugs. The TBI was cleaned by the dealer under warranty around 32k when I complained of rough idle and the problem disappeared. Any advice on whether or not I should change plugs or pull the TBI for a cleaning?

hcvone · November 30, 2005

I use NGK TRI55 Irridium's in my Corvette's and Escalade.

Halen5150 · December 1, 2005

I had the A/C stock platinums taken out at 95K miles. Never had problems with them. I switched to the iridiums and didn't notice any differences. I switched the stock wires out last week with MSD 8.5mm wires. Honestly, I can't tell a difference over stock plugs and wires. But the A/C Delco wire set was around $72 at O'Reilly, and the MSD was $76, so I went with them, of course.

RyanZ71 · December 1, 2005

Most people will never notice a difference with different brands of wires, or between the 3 AC/Delco plugs. I just notice the difference when I switch brands of plugs. Usually the type of plugs the vehicle came from the factory with will work the best for that vehicle.

fossil · December 5, 2005

put in the OEM plugs ....the wrong plugs can take out your coil packs due to improper resistance

BRZ71 · December 5, 2005

Bosch Platinum 2

Ben · December 15, 2005

I no longer buy expensive plugs, unless for the FWD "cars" that have a bank that is TOUGH (impossible) to get at. Then I'll get platinums and leave them in there a long time.

My 96 Sub's 7.4L Platinums were changed at 80K miles and again 50K miles later. 3rd set of Delco platinums and not going to again.

The hockey pucks on the ground electrode fell off on the 80K set and were about to fall off on the 50K set. Both sets had the ground electrode worn down too much.

Ditto on all of my other cars and trucks.

I'm going to go with mud hen plugs and change them often. Dependent on which vehicle, but surely in the 30K-40K range.

Instead of indexing them, I'm going to modify them by cutting off the ground electrode so that it's end/edge is centered over the positive electrode.

Picture is of a set of Delco Platinums modified and ready to go into my dad's Caddy STS. It will burn both front tires across any intersection and embarress most BEFORE this mod and now it runs even better.

For my 2 seater, NGK is the only brand and will try the newest, plus modify them as pictured below.

Unmodified for reference

I've not had much luck with any of the three Bosch platinums on any of my vehicles (15 in the family and 5 that I take care of directly). I liked the old Bosch "T" series, which had 3 or 4 ground electrodes pointed to the center electrode's **SIDE**.

This is to expose the fuel/air mixture directly to the spark and the flame propagates better and faster than when shielded by OEM design (ground elctrode covers the center electrode). That is mainly for those engines which have fouling problems, but why should we get lesser performance for the small percentage that have fouling problems?

hoorders · February 7, 2006

Ngk tr55's over here too, been useing them since the truck had about 15k.I change them when they are at 10-15k never had a bad one yet .Just got a set of Accel 8mm Extreme 9000 wires to replace the stock ones, I think its time with 55k on them .

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Just put some TR55's and Taylor 10.4mm wires into my truck..............she idles and runs smooth as a babies behind.......very happy with the plugs and wires thus far.

az'03Silverado · February 13, 2006

Could any of the 5 people running Bosch +4's post a short critique? I just bought a set to try but haven't put them in yet. I've heard everything from "they're awsome" to "they suck". I don't think a reputable company like Bosch would market them for 'modern cars and trucks' if they hadn't tested them and found them to be safe for our engines. Any info would be good. No bashing, just honest feedback, please. I plan to put them in 'just to see' regardless of the feedback.

saltwater_addict · February 13, 2006

I put in the bosch +4's at 100k and replaced the wires although cant remember what wires 75$ anyhow i havent had any problems at all and i currently have 156k 2000 silverado 5.3 even the stockers at 100k didnt seem all that bad just coulndt live with myself if i didnt change them

poolguy78 · February 26, 2006

I just pick up a set of bosch platium plugs for my 1999 1500 regular cab

4.3L with 250 000 km..doesn't seem to have any running problems but i took a plug out (ac delco plug) and the tip was pretty well burned off

so i thought it was time to change them..don't know if the previous owner ever replaced them but i will be...i'll be doing it tomorrow and

will post back the results.

Greek · April 3, 2006

Just bought some AC Delco platinums to replace my originals last Friday from the dealer ($8.30 each). I also got a set of wires ($99). My 2000 Silverado Z71 has 94,000 miles on it.

I just pick up a set of bosch platium plugs for my 1999 1500 regular cab
4.3L with 250 000 km..doesn't seem to have any running problems but i took a plug out (ac delco plug) and the tip was pretty well burned off

so i thought it was time to change them..don't know if the previous owner ever replaced them but i will be...i'll be doing it tomorrow and

will post back the results.

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Greek · April 18, 2006

OOps.

What the dealer gave me were Iridiums! I gapped them at .060 and she runs real quiet now!

Just bought some AC Delco platinums to replace my originals last Friday from the dealer ($8.30 each). I also got a set of wires ($99). My 2000 Silverado Z71 has 94,000 miles on it.

I just pick up a set of bosch platium plugs for my 1999 1500 regular cab
4.3L with 250 000 km..doesn't seem to have any running problems but i took a plug out (ac delco plug) and the tip was pretty well burned off

so i thought it was time to change them..don't know if the previous owner ever replaced them but i will be...i'll be doing it tomorrow and

will post back the results.

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