Help me troubleshoot this misfire - 2006 Chevy Aveo 1.6L

[nthach]

Yea, I would be looking at fuel trims as well to rule out fuel. EGR works alongside lean burn to help keep combustion temps down that creates NOx otherwise.

I dunno how Daewoo/Opel engines work with that. Hondas tend to misfire and act weird with clogged EGR(the intake manifold has a network of EGR passages in them) or if the valves need to be adjusted. Can you get data when EGR is being commanded when the misfires happen? Toyotas will have a EGR EGT PID, Fords have something similar for the DPFE sensor.

 

[NibbanaBanana]

I went to check the resistance in the wires and pulled the plugs to take a look at them. Found one plug with a cracked insulator. Replaced that autolite copper plug with an ACDelco copper plug. Problem solved. Completely resolved. Car runs absolutely beautifully now. Thanks for the help Oilmen.

Those plugs were new this spring too.

Nibbana

 

[nthach]

I went to check the resistance in the wires and pulled the plugs to take a look at them. Found one plug with a cracked insulator. Replaced that autolite copper plug with an ACDelco copper plug. Problem solved. Completely resolved. Car runs absolutely beautifully now. Thanks for the help Oilmen.

Those plugs were new this spring too.

Nibbana

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I wouldn’t be shocked if the Delco plug was made by Autolite/First Brands in China/Mexico or by Driv/Champion in the US or Mexico.

Down the road, I’d use NGK or Bosch “OE” - your engine is Korean-German in origin.

Seeing cracked insulators is rare but I saw a Ford Tech Makuloco post on FB about ham-fisted flat rate techs using an electric impact or ratchet to send plugs home wirh cracked insulators.

 

[NibbanaBanana]

I guess it's hard to tell where a lot of things are made these days. I just wanted to stick with the copper plugs because that's what I've been using for over 263K miles on this car. And this car I paid $9800 new BTW. Have always changed plugs at 30K mile intervals with never a single issue except the last time I was due to change them I had left them in, only gapping, just as an experiment to see what goes wrong with spark plugs. And in not too many thousand miles they did start to fail with bad missing due to carbon tracking.

Did I crack that insulator? I don't think so.

 

[nthach]

I guess it's hard to tell where a lot of things are made these days. I just wanted to stick with the copper plugs because that's what I've been using for over 263K miles on this car. And this car I paid $9800 new BTW. Have always changed plugs at 30K mile intervals with never a single issue except the last time I was due to change them I had left them in, only gapping, just as an experiment to see what goes wrong with spark plugs. And in not too many thousand miles they did start to fail with bad missing due to carbon tracking.

Did I crack that insulator? I don't think so.

A good single-platinum plug(NGK G-Power/Denso Platinum TT or even Bosch’s OE-Finewire Platinum, not the old encased insulator design) isn’t much more than a standard plug. Even Autolite’s platinum/Iridium XP aren’t that expensive. It’ll buy you a little more time before replacement - it won’t be as long lasting as an OEM double platinum/iridium-platinum plug.

Spark plug insulators are made out of aluminum oxide, a ceramic but closer to glass than porcelain that was used. They are brittle though. Autolites and Champions were made in the US, not anymore. The Autolites I’ve seen I’ve seen were made in China unless they were a HT plug for Ford.