Another Spark Plug Thread

[mattbta]

Curious... why are you considering switching from the iridiums?

Boredom. I don't have any misfires with these...but the idle is a tad rough. It's likely not spark related, but easy enough to rule out. It's probably trans/convertor or motor damage from coolant intrusion due to cracked heads. But it's cheap and checks an attempt off the troubleshoot list.

 

[BatsTDK]

Boredom. I don't have any misfires with these...but the idle is a tad rough. It's likely not spark related, but easy enough to rule out. It's probably trans/convertor or motor damage from coolant intrusion due to cracked heads. But it's cheap and checks an attempt off the troubleshoot list.

Interesting. I heard people were getting a smoother idle with the iridiums. I'd be interested to hear your findings when you do the change.

 

[easymoney]

This is crazy but i have 225k miles on my tahoe and pretty sure it has the original spark plugs. I did buy it used 2ith 110k on it but the lady i bought it from said she had only changed tires on it and transmission had gone out and wasjust rebuilt. The plugs are 41-985…the plugs still work but im worried thry might be rusted in there so i want to change them out but cant buy what was in there…

 

[easymoney]

I had the same issue cant buy the parts that came in it. Had 41-985 ac delco….they lasted over 224k on them as did the wires. Starting having a little issue with rough idle…..i replaced with ngk-1465 i figure motor wont last that long but running very smooth. I couldnt buy the oem 0445 ac delco wires either with the same part number. Thats annoying i went back with ac delco 9748HH wire set..