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4.7,

Thanks for the reply. I checked the #6 plug wire then cleared the codes and drove it today. Data log attached. Knock retard events happens starting at 2:49. I have been thinking about the...

So, today on the way back home with the family on a leisurely drive the Check Engine light popped on. I ran the codes in VCM Scanner and heres what populated:

83104

P0300 and P0306, Random...

Mango,

During this whole troubleshooting process/thread I adjusted the stock fuel map by 2 percent upon the advice given here. I do not have a wideband yet, I know I badly need one. I have not...

4.7,

Yeah, I thought that the 2 degree tolerance seemed reasonable. I am leaving on this trip in less than two weeks so I will do the valve lash after. Ive adjusted valves before, nothing to it,...

So,

I took the truck to a shop today. They hooked their scan tool to it and we went for a short drive. He noted that he saw no misfires which was unusual according to him. He also saw the...

Here is my latest test run. It did shudder going up the hill. If you look at the log starting at 8:40 you will see the multiple knock retard events which coincide with the shudder i felt.

4.7, not...

Drove it today, felt better but I havent driven up my "test hill" so I didnt detect any shudder. The log does still show knock retard engaging during a heavy acceleration event. See log file...

I made an assumption that what I was looking at was the knock sensor. Good to know.

Good to know about the trans, so it should shift properly regardless of the MAP.

I will post again when I...

So, I regapped the plugs to .050 but I havent test driven it yet. When the plugs were out I performed a compression check:
1: 140
2: 127
3: 128
4: 128
5: 130
6: 132
7: 125
8: 135

4.7,

No, I havent done a compression check. I really dont have any indicators of engine problems save this issue that has popped up recently. When I pull the plugs I can do that easy enough.
...

I don't have platinums, I've got standard plugs, ac delcos I think. Not sure of the p/n. It's always the simple things that stumps us..... Well, we will see

So, I went with the factory recommend setting of .060. I'm going to try resetting them to .045 tonight.....

82695
82696

Ok, how do I remove the previously uploaded files from the forum upload manager?? It wont let me upload anything else til I do. I looked in the FAQ section, no help.

Ok, how do I remove the previously uploaded files from the forum upload manager?? It wont let me upload anything else til I do. I looked in the FAQ section, no help.

Ok,

For the replacement parts I never go with the cheapest, I usually get AC Delco when available.

When reinstalling the wires I did go back in the factory wire looms and routing.

The gas...

So, I didnt feel any noticeable difference.

I did log some knock retard events, see screen grab. It didnt shudder but like ive said before it wasnt doing it every time i drove. At some point this...

Here is the file from this mornings test drive.
82626

So,

I drove it this morning after loading the tune with the recommended changes:

AFR 14.1:1,

Added 2% to MAF and VE Primary and secondary tables

PE Enrichment Rate, 0-40% throttle left...

So is this the "entry rate"? 82603 If so this is the table that comes up: 82604 and it looks like 1.00 is the highest value for it. I set it to that.

And this is what I found under the PE tab for...

So, im going through the tune and ive found and adjusted most of what you recommended, but I have a few questions. When i added 2% to the MAF Airflow vs. Freq chart it gave me this warning:

82601...

OK, I will check the MAF readings when I take it out for longer data log test drive, hopefully tonight. And I will go ahead and change the VE, MAF, and PE tables/settings.

I do want to improve the...

Not to second guess you but before I dive into tuning do you think my log looks good otherwise? (I can get a longer log file to see if it will shudder) In other words, would you suspect any other...

I did do intake leak test not long ago where I sprayed starting fluid around the intake area, the rpm never changed so I think Ive eliminated that as a possibility. I could do a smoke check, but i...

8257882579

Here are two screenshots, one of the LT Fuel Trim and another of the ST Fuel Trim, both of the exact same time grab. This is also a knock retard event. And two more below where I...