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Discussion Starter #1 (Edited)
Has any one switch over and used the e3.74 spark plug. If so any noticeable difference? And why the .74? There's other variants from e3 such as the .56 or .66. Any info would be great. I am the second owner of this 2009 Sky Red Line and I'm told by the previous owner that the current plugs are the originals. So a change in plugs is in the very short near-term future.

Also, what replacement performance coils are recommended?

Thx so much . . .
 

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On the turbo cars, even though the manual says 100k, it's actually about 25-35k. Performance really falls off after about 60k on them and then the CELs follow. Don't waste your $$$ on gimicky spark plugs. A lot of the time they make the combustion chamber run hotter then what it is meant to be, and with the thin piston heads, they easily melt holes in them. The coils are also fine...don't worry about a "better" one until you're putting more air/fuel into the motor. So basically what I'm saying is that the OE stuff is just fine until your upgrades call for it. Of course what I said is for the turbo cars....but same would go for 2.4L as well.
 

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Discussion Starter #4
So I changed to e3.74 plugs to try them out. They look very impressive. I’ve driven about 100 miles on them and I did not feel any noticeable push or drop in performance. However, what I now have is an intermittent P2178 code that comes and goes. I’m looking at changing out the e3’s for something else. The originals have about 35,000 on them and look clean however the center electrode appears to be worn to the size of a pin head. Any recommendations on an alternative third choice to experiment?
 

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So I changed to e3.74 plugs to try them out. They look very impressive. I’ve driven about 100 miles on them and I did not feel any noticeable push or drop in performance. However, what I now have is an intermittent P2178 code that comes and goes. I’m looking at changing out the e3’s for something else. The originals have about 35,000 on them and look clean however the center electrode appears to be worn to the size of a pin head. Any recommendations on an alternative third choice to experiment?
You are much like me 8 years ago when I bought my car....looking for something better then what GM gave me. Trust me, as I was told, when I was a baby owner of a Kappa, the OE stuff like headlights(Soup), plugs, coils, hoses, etc are just fine until you add a different turbo. You're getting the p2178 because you have 1 of possibly 2 things that are an issue.... #1 (and probably the reason) is that you posted here and still put the e3 plugs in your car, stick with the ACDelco plug... or #2 , you have a HPFP that's leaking into the oil. This is BAD!! That's what I had. If it still happens after you put the OE plugs back into it, this is the issue. Trust me. I spent almost a year chasing this code. Stick with ACDelco plugs...as I stated, we've all learned here the others are gimmicky and cause issues...as you've now found out. And if you were the one posting on Facebook, and I said not to do it there.....DO NOT listen to the quacks on Facebook!!! Last week on Facebook, I was told by someone that had a "GM chip installed" that they were making 300whp with no mods. First, there is no "GM chip", it's a program in your ECM(but this is a complete other story)...You need to come here and talk to us if you want real answers. On Facebook there's a lot of mis-information, and most of the guys suppling it say that about these forums...which isn't true. These forums are legit in ANYTHING you want to do or ask. And if nobody here knows, we all put our thoughts into it.

Now this being said, if you were like me 8 years ago, you aren't going to listen about putting the ACDelco plugs back in and you're going to spend another $80 on different plugs, which are going to still cause issues. Then and only then will you say, "I should have listened to them"..... But I don't blame you, trial and error is the only way to know if what I'm saying is true. Just like I didn't believe Soup about my headlights...but after our little tiff online, I respect everything Soup (and this group) now tells me. Now go out there and spend $20 on 4 new ACDelco plugs instead of $80 on gimmicks. (At least you don't have to buy 16 plugs like I do for my Charger!!). Please let us know if the plugs fix the p2178 issue. I can give you instructions on the HPFP replacement if it doesn't. ;)

EDIT: After reading this, I may have came off a little harsh...not trying to do that. Just trying to explain that I didn't believe a lot at first when people told me here what to do and not to do...it's human nature to not trust someone...especially a complete stranger online. Hope you get this sorted out....and stick with the OE plugs!! ;)
 

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I usually switch to NGK plugs on all of my cars as I have found them to be excellent for both street and track over the years, but the reputation of the stock spec plugs on the LNF engines seems to be excellent, so I intend to stick with them.

Why do you (the OP) want to change to different plugs? What are you hoping to gain?
 

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Discussion Starter #9
Thank you so much TomatoSoup and Ghost. I’m switching to a new set of AC Delco plugs as you all suggest. Hopefully that will cure this intermittent code from appearing. BTW, I’m not a FaceBook guy, so that wasn’t me. I’m totally in love with the Sky and the LNF 2.0T engine. Any HPFP issues I’ll let you know but so far no sputtering just silky smooth acceleration and idle.

So why change the plugs? At 35k miles it seemed like a good idea and why not experiment ? Flog next, I’m whimpering back to OE stuff.
 

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Thank you so much TomatoSoup and Ghost. I’m switching to a new set of AC Delco plugs as you all suggest. Hopefully that will cure this intermittent code from appearing. BTW, I’m not a FaceBook guy, so that wasn’t me. I’m totally in love with the Sky and the LNF 2.0T engine. Any HPFP issues I’ll let you know but so far no sputtering just silky smooth acceleration and idle.

So why change the plugs? At 35k miles it seemed like a good idea and why not experiment ? Flog next, I’m whimpering back to OE stuff.
LOL....no biggie. Just a quick note, there won't be any sputtering or unusual effects of a leaking HPFP. If you have a manual and leave in gear during coast down, you might get backfiring...if you do, its a sure sign of fuel leaking into the crankcase from the HPFP. You won't have any other symptoms....if your's fails the same way mine did.... Most have catastrophic failure and they aren't able to do anything but limp home....but this is the other way it can fail. It's a pretty common issue on the Cobalt forum....
 

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Discussion Starter #12
So I have diligently and meticulously changed to a new set of AC Delco's. What is your opinion of the condition of the new E3.74's after only 100 miles in the Sky LNF 2.0L turbo? Numbered 1, 2, 3, 4 cylinder from left to right, there's a huge variance in condition. Plugs 1 and 2 seem OK, but plugs 3 and 4 are quite sooty and beaten up. Comments welcome.
 

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Last time i checked AC Delco had two spark plug models suitable for us...When i asked them on Facebook they didn't point out the differences......Anyone here has tried both or just the default/stock ones?
 

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Here is a quote right from e3's website:

A black, feathery carbon deposit on your spark plugs can be an indication of a weak spark or an overly rich fuel mixture. Causes may include a stuck choke, misadjusted or heavy carburetor float, a leaky injector or carburetor needle valve, low coil output or high resistance in your spark plug wires. A dead oxygen sensor or coolant sensor also can be a cause of carbon fouling.

So my guess is that these plugs don't live up to their hype. My guess is that the triple ground electrode does nothing more then to divide the spark in hopes of a more "even" fuel burn in the cylinder. And with the black already on it, and your p2178 code, the spark probably isn't hot enough (concentrated enough) to burn all the fuel in the cylinder.

Maybe someone can chime in here.....
 

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Last time i checked AC Delco had two spark plug models suitable for us...When i asked them on Facebook they didn't point out the differences......Anyone here has tried both or just the default/stock ones?
One is for higher boost engines IMSMC. Just go stock unless you're pushing over 25psi of boost.
 

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Discussion Starter #16
I’ll run with the new AC Delcos for a while (100 miles) and then compare the burn with the E3s. Hopefully during that period the OBD code will disappear.
 

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Discussion Starter #17
So looking at the E3 plugs after that first 100 mile test drive, it looks like cylinders #3 and #4 are running rich (sooty) while number #1 and #2 are lean. Can that happen, and if so what would be the cure to even it up?

I’ve purchased a OBD2 scanner and on the first drive with the new AC Delcos I now get code P2187 added. So something weird is happening. Thx.
 

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Is there a drawback to go with the ones for higher boost engines?
Probably. The higher the boost the "colder" the plug you want to run to prevent knock/detonation. I believe the stock design keeps the tip within an optimal range for stock to 23-24psi conditions. if you aren't getting to the higher pressures and temps but running the colder range plugs, you won't also be cleaning off the tip and it can start to foul out quicker.

The other difference the plug may have, is a slightly shorter plug gap as set out of the box or as designed with bend in the electrode. Air is a pretty good resistor, and when you run higher boost (more effective air), there is more resistance, which can also cause misfires if it can't create the spark properly.
 

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Probably. The higher the boost the "colder" the plug you want to run to prevent knock/detonation. I believe the stock design keeps the tip within an optimal range for stock to 23-24psi conditions. if you aren't getting to the higher pressures and temps but running the colder range plugs, you won't also be cleaning off the tip and it can start to foul out quicker.

The other difference the plug may have, is a slightly shorter plug gap as set out of the box or as designed with bend in the electrode. Air is a pretty good resistor, and when you run higher boost (more effective air), there is more resistance, which can also cause misfires if it can't create the spark properly.
Well i changed my old spark plugs at 25k kilometers and now i have 55k kilometers so i'm thinking on changing them again that's why i asked.
 
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