2004 6.0 NV4500 Tahoe

[Dantheman1540]

Glad you found it.

It's always the simple things that are overlooked.

 

[pwtr02ss]

My avalanche was chopping hard when I first started it. I thought, man this cam is a lot more aggressive sounding than I thought it was going to be.

Then I logged it. Two cylinders misfiring. I had driven it up the road and everything. Nothing felt off. My plug wires had gotten wet in the bed when I had the engine out. It had some rust on the contact. Swapped wires and all is well. Cam toned down a lot lol

 

[pwtr02ss]

I want to mention that I did NOT want an aggressive sounding cam in the avalanche so I was disappointed. Much happier after I shorted that out.

 

[Dantheman1540]

My avalanche was chopping hard when I first started it. I thought, man this cam is a lot more aggressive sounding than I thought it was going to be.

Then I logged it. Two cylinders misfiring. I had driven it up the road and everything. Nothing felt off. My plug wires had gotten wet in the bed when I had the engine out. It had some rust on the contact. Swapped wires and all is well. Cam toned down a lot lol

It's funny when the truck would cold start I could notice not only a lot more gas smell from the exhaust (bad enough to make me cough loading the rear hatch) as well as the cam seeming to chop harder. I summed it up to just a cammed cold start and not cats like all the cool kids make videos of.

I'm really wondering how many misfires it was having during WOT, especially at the track.

 

[pwtr02ss]

It's funny when the truck would cold start I could notice not only a lot more gas smell from the exhaust (bad enough to make me cough loading the rear hatch) as well as the cam seeming to chop harder. I summed it up to just a cammed cold start and not cats like all the cool kids make videos of.

I'm really wondering how many misfires it was having during WOT, especially at the track.

It for sure wasn't helping you any. Got er sorted out now though. Sucks when something happens like that but it happens to be best of us lol

 

[Dantheman1540]

It for sure wasn't helping you any. Got er sorted out now though. Sucks when something happens like that but it happens to be best of us lol

Now that it's ironed out I might as well pull it all apart and mess it up again

 

[Rocket Man]

Now that it's ironed out I might as well pull it all apart and mess it up again

YES! DO IT!!!

 

[Sam Harris]

I actually already bought one with trans temp and more importantly it has a 7k rpm tachometer which never came from the factory in anything and as far as I can tell only one guy can do them. It’s pretty badass and although it was sorta pricy it’s not as bad as a lot of clusters I’ve seen for sale.

I will keep that site in mind tho I’ll end up wanting trans temp in my other truck eventually.


Yeah your twice as low as me I have no issues in the rear but the 14b is a 1/2” or so wider in each side so that helps clear the inner fender liner back there. I remember it used to rub a little before the 14b swap.

Luckily I don’t have to touch any metal I really don’t like rolling fenders and whatnot I’m not good at that stuff.

That cluster..!

 

[Dantheman1540]

YES! DO IT!!!

I’m dewing et this weekend!!!!!

That cluster..!

It makes me very happy every time I drive at night, Carl is a beast!

 

[pwtr02ss]

Now that it's ironed out I might as well pull it all apart and mess it up again

I hope you like the heads. Interested in your thoughts after you get them on. I hope they help! lol

 

[iamdub]

I summed it up to just a cammed cold start and not cats like all the cool kids make videos of.

It was cool in 2020.

 

[iamdub]

I will probably end up putting on .051 gaskets to get close to 10.5cr in case I miraculously find some sort of Wuhan whirly boy to force-feed this thing.

Other good/bad news is that my low oil pressure on cold start issue seems to have eliminated itself and I think it was caused by a severe misfire which I recently solved with the new plug wires. The truck has not only started up with 40psi every morning but it doesn't act funny and buck/surge like it used to either. the bad news part of this is that I beta my head against my laptop for close to a year trying to solve the weird startup condition that I was convinced was tunes related. I think the entire time it had a severe misfire. Another reason I think this, is that when I did the plug wires the other day I was being bothered by a neighbor talking to me the entire time and I actually started the truck with 2 wires disconnected from the plugs #4/#6. The truck started up fine and I wouldn't have noticed there was an issue except I did a visual inspection before I closed the hood and saw them. My point is that these trucks will run remarkably well even down on cylinders.

Do you know if you can "tune out" misfire sensitivity? I scanned mine the other day and had 0 misfires throughout about 20 minutes of driving- cruising, WOT, 0-100+, etc. I just thought these things practically had built-in misfires.

 

[pwtr02ss]

Do you know if you can "tune out" misfire sensitivity? I scanned mine the other day and had 0 misfires throughout about 20 minutes of driving- cruising, WOT, 0-100+, etc. I just thought these things practically had built-in misfires.

You have to tune that out for your stall or it throws the cel. I think I did below a certain rpm. I can't remember the exact number

 

[iamdub]

You have to tune that out for your stall or it throws the cel. I think I did below a certain rpm. I can't remember the exact number

Interesting. Well, I gave it all sorts of RPM and throttle inputs. I hope it's not tuned out that much. Do you know where I'd find this info?

 

[Tonyrodz]

Interesting. Well, I gave it all sorts of RPM and throttle inputs. I hope it's not tuned out that much. Do you know where I'd find this info?

Why wouldn't you want to tune out alot of misfires? You'd want that in there?

 

[iamdub]

Why wouldn't you want to tune out alot of misfires? You'd want that in there?

Well, I don't mean so much as tuning them out. I meant dumbing down the crank and/or cam sensor(s) so they're not detected.

I guess it's not so important as someone excessively dumbing down the knock sensors. Like I said, I thought a misfire (at least a detected one even if it's not actual) here or there was just part of normal operation for these. When I saw all zeros, my first thought was that something wasn't right, and could those sensors be so desensitized that they're missing some things they shouldn't be.

 

[Rocket Man]

Well, I don't mean so much as tuning them out. I meant dumbing down the crank and/or cam sensor(s) so they're not detected.

I guess it's not so important as someone excessively dumbing down the knock sensors. Like I said, I thought a misfire (at least a detected one even if it's not actual) here or there was just part of normal operation for these. When I saw all zeros, my first thought was that something wasn't right, and could those sensors be so desensitized that they're missing some things they shouldn't be.

That’s what I thought as well. When @Tonyrodz said a few days ago he had zero misfires I thought something was wrong. And on top of that it wasn’t running good which seemed even stranger.

 

[randeez]

if its not firing at all, it cant be misfiring

 

[iamdub]

if its not firing at all, it cant be misfiring

 

[Dantheman1540]

Ok I definitely want to look into desensitizing the misfire readings because it seems to be BS IMO. I think before the weird startup driveability problems maybe have been a bad plug wire because that’s totally gone *knocks on wood*. The 4k Misfires has got to be BS since it only happens at idle and the idle feels rock solid.

How do I mess with these tables? Add or subtract? Where? And how much?