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Wire Arc?

mawint

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Silverado4x4 Senior Enthusiast

Silverado4x4

Posted
Posted

To be honest, I have used Champions in GM engines before without issue. It was however a 95 bonneville with the 3.8, but that engine was temperamental on plugs also. If you ran Bosch in it, it would throw a fit while Champions ran just fine.

 

Since I'm not new to the whole this engine likes this plug better than the other, it doesn't surprise me that the ACD plugs work much better than the Champions. Without coming here however, I wouldn't have found out that GM changed gaps and I would still be diagnosing this thing. Even if this didn't solve my issue, it would have helped my peace of mind to know the plugs are now gapped to spec and I would have changed them anyways.

 

There is no dought to your statement as I also ran Champion plugs in vehicles and they ran just fine but those were vehicles in the 70s but todays vehicles you stick with OEM.

bossier62guy Senior Enthusiast

bossier62guy

Posted
Posted

I run copper core NGK's in mine and they work just fine.....it came from the factory w/ Nippondenso plugs. This 5.3 has never seen an AC Delco plug in it's 112K life.

snow man Enthusiast

snow man

Posted
Posted

Most ACDelco plugs are made by champion. The rest are NGK. If their is a row of diagonal hash marks on the steel part of the plug just below the six sided 'tool engagement' area, it is a champion. With that in mind they may be a unique AC design manufactured by an outside vendor (champion).

mawint Enthusiast

mawint

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Bad news bears. Sitting in a parking lot idling today and it started stumbling again. Had it read and p0300 showed up. Ugh, good news is I had a warranty on the wires so those will get switched out along with checking the plugs again. Not a happy camper.

bossier62guy Senior Enthusiast

bossier62guy

Posted
Posted

Bad news bears. Sitting in a parking lot idling today and it started stumbling again. Had it read and p0300 showed up. Ugh, good news is I had a warranty on the wires so those will get switched out along with checking the plugs again. Not a happy camper.

What makes you think this is related to plugs or wires? Didn't you post something about having a rich condition on this vehicle prior to changing the plugs/wires? Didn't you also say you had 2 champion plugs that were white when you pulled them after only a short time? You never did say what brand plug wires you went with either. I don't buy the AC Delco plug or wire theories here, I've been running NGK's and MSD plug wires on my truck w/o any issues whatsoever for years. I think maybe it's time to turn your attention to your previous issue.

mawint Enthusiast

mawint

Posted
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Posted

What makes you think this is related to plugs or wires? Didn't you post something about having a rich condition on this vehicle prior to changing the plugs/wires? Didn't you also say you had 2 champion plugs that were white when you pulled them after only a short time? You never did say what brand plug wires you went with either. I don't buy the AC Delco plug or wire theories here, I've been running NGK's and MSD plug wires on my truck w/o any issues whatsoever for years. I think maybe it's time to turn your attention to your previous issue.

The reason I think it's wires is because when I was changing the wires yesterday, one went on really easy with no audible click. Also, since the truck ran beautifully until this afternoon and the only thing that has changed since yesterday is plugs leads me to believe that I either messed up a plug or a wire isn't contacting right.

 

When I picked up wires, they had one brand available and it was whatever oreillys house brand is. I would switch them to a different brand but since they are warrantying them for free, I will give them another shot.

 

You are correct, I did have a random misfire about a month ago related to the O2 sensor on the passenger side. The two white plugs I pulled yesterday were cylinders 1 and 3, 3 being worse than one. When I pulled the plugs originally, all passenger plugs were black.

txab Senior Enthusiast

txab

Posted
Posted

Did you change the O2 sensor or discover why it was running rich on that side? And John while plugs may not be a big deal in this case, he was using a plug with an incorrect gap which has shown to cause the symptom he described originally. Thus the plug swap

 

If your problem persists, I'd look into:

 

intake gaskets for leaks

Take a fuel pressure reading

 

Both can throw P0300 code

mawint Enthusiast

mawint

Posted
  • Author
Posted

Did you change the O2 sensor or discover why it was running rich on that side? And John while plugs may not be a big deal in this case, he was using a plug with an incorrect gap which has shown to cause the symptom he described originally. Thus the plug swap

 

If your problem persists, I'd look into:

 

intake gaskets for leaks

Take a fuel pressure reading

 

Both can throw P0300 code

 

 

O2 sensor was changed, CEL went off when I changed it along with the P0300 from about a month ago. I also changed plugs and wires then. Truck ran fine for about two weeks then I started having idle issues. When I pulled the plugs to switch to the AC Delcos last night the plugs on the passenger side looked fine.

 

When checking for codes, I specifically looked for an O2 sensor code today but there wasn't one.

 

I will look into that next. I just find it weird that I drove it to work this morning (about 30 min) and had no issues, even idled it in the parking lot for a bit to make sure. Drove it to my destination after work (about 30 min), was waiting for someone to come out and after idling for 15 min it started to stumble again. This time bad enough to throw a code.

 

My intention isn't to throw parts at it but like I said, they were willing to swap the plug wires for free and since that is the only thing I messed with since yesterday besides plugs, I figured I would give it a shot.

bossier62guy Senior Enthusiast

bossier62guy

Posted
Posted

The plot thickens I see LOL......

 

I understand the plug gap txab but you've got to remember I'm driving an 02 that I bought brand new and it too had the requirements for the ,060 plug gap before GM changed it. The only issue I ever noticed from it was a slight, and I mean slight, miss at idle.....the denso plugs that came from the factory looked perfect when I pulled them. I'm with you as far as checking the intake for leaks and the fuel pressure next.

 

Couple more questions:

What led you to an O2 sensor from a P0300 code?

Was it a pre or post cat sensor?

Was the code erased with a scan tool after the sensor was changed?

Were the two plugs that were white the ones that were loose?

You're on your 3rd set of plugs and 2nd set of wires right now since you first experienced the P0300 correct?

TimmyG Senior Enthusiast

TimmyG

Posted
Posted

Also dont froget the easy stuff remove the battery cables and give them a good cleaning along with the battery terminals.

 

Sent from my SCH-I535 using Tapatalk 2

 

 

mawint Enthusiast

mawint

Posted
  • Author
Posted

The plot thickens I see LOL......

 

I understand the plug gap txab but you've got to remember I'm driving an 02 that I bought brand new and it too had the requirements for the ,060 plug gap before GM changed it. The only issue I ever noticed from it was a slight, and I mean slight, miss at idle.....the denso plugs that came from the factory looked perfect when I pulled them. I'm with you as far as checking the intake for leaks and the fuel pressure next.

 

Couple more questions:

What led you to an O2 sensor from a P0300 code?

Was it a pre or post cat sensor?

Was the code erased with a scan tool after the sensor was changed?

Were the two plugs that were white the ones that were loose?

You're on your 3rd set of plugs and 2nd set of wires right now since you first experienced the P0300 correct?

The original P0300 was coupled with a code for Bank 2 Sensor 1, pre-cat. Once I changed it, both codes went away originally.

 

The code was not erased with a scan tool, after three consecutive starts, it disappeared on its own.

 

Not counting the original plugs and wires, the AC Delcos were the second set and once I swap the wires, it too will be the second set.

 

The two that were loose were cylinders 4 and 8.

mawint Enthusiast

mawint

Posted
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Posted

Update:

 

Went to change the wires this morning, upon opening the hood and starting to pop off wires and checking plugs. The wire that I had concerns about had completely fallen off and a few others were questionable on how easy they came off.

 

All of the new ones had a nice "click" when putting them on, started it up and no more stumbling. I haven't driven it yet but will soon, I still need to return the old wires. Will report back once I do.

 

Thanks for the help everyone!

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