Rough idle and intermittent stalling/ incomplete stall?

[pentode]

Yes i have checked it, its all flat, there was a metal reinforcement in that spot on the head gasket

Yeah, if it were leaking between the cylinders it wouldn't be clean either, it just looks odd.

Have we fully ruled out vacuum leaks?

 

[pentode]

Probably unrelated, but is it just me or are those exhaust valves pretty deep in their seats?

We've got possible fuel burn issues here with the codes, I'm just sitting here thinking about what's going on and waiting for one of the gurus to jump in.

 

[NaomiTheNomad]

I saw that, wasnt too happy because these are brand new heads, just got a valve job, it seems to hold when i sprayed wd 40 in that valve

Probably unrelated, but is it just me or are those exhaust valves pretty deep in their seats?

We've got possible fuel burn issues here with the codes, I'm just sitting here thinking about what's going on and waiting for one of the gurus to jump in.

 

[pentode]

I saw that, wasnt too happy because these are brand new heads, just got a valve job, it seems to hold when i sprayed wd 40 in that valve

I'm on my phone but on second look, actually the intake valves look a little recessed too. Not sure whether the 3.0 valvetrain has enough tolerance to make up for that, I'll defer to the experts on that but it seems like if it were bad enough it might explain rough running. Any valvetrain noise? I'm guessing not.

Edit: if they're sealing, they're sealing

 

[NaomiTheNomad]

I'm on my phone but on second look, actually the intake valves look a little recessed too. Not sure whether the 3.0 valvetrain has enough tolerance to make up for that, I'll defer to the experts on that but it seems like if it were bad enough it might explain rough running. Any valvetrain noise? I'm guessing not.

Edit: if they're sealing, they're sealing

No noise at all, im going to do yet another compression test once its up again, unfortunately this is the only vehicle we have right now that will run. If its still low i have a warranty on the work the machine shop did to the heads, im a bit skeptical about that one exhaust valve, i worry a bit that it is restricting the exhaust flow.

 

[pentode]

I'd love to get an opinion from a 3.0 expert or a machinist, and I always hate to sound like I'm questioning somebody's work, but I'd expect new or reconditioned heads to have valves that sat a bit proud of the seats.
If the heads were flat though I doubt it's head gasket issues. Compression test will be great for diagnostics

 

[NaomiTheNomad]

I'd love to get an opinion from a 3.0 expert or a machinist, and I always hate to sound like I'm questioning somebody's work, but I'd expect new or reconditioned heads to have valves that sat a bit proud of the seats.
If the heads were flat though I doubt it's head gasket issues. Compression test will be great for diagnostics

I 100% agree

 

[SenorNoob]

I'd expect new or reconditioned heads to have valves that sat a bit proud of the seats.

I'm curious what the thinking is here. That looks like stock to me.

 

[NaomiTheNomad]

I wish i could give a yae or nay on the preformance. Truck seems like it wants to sit a bit longer, as i primed the system i smelled fuel and found the main fuel connector on the fuel pump decided to break. I think these trugrade fuel pumps are trash, third trugrade to have the plastic break on me this year

 

[NaomiTheNomad]

Alrighty, shes up and running again. Power feels better. Pretty sure the valve is affecting my cold start up, it idles pretty rough for the first few minutes then smooths out, power is better than last time and i dont have a weird whistling noise anymore or stalling. Compression has improved from 130 on that cylinder to 138 so i guess the valve is leaking, one other cylinder floats around 130-135( no improvement with oil added to cylinder), all others are 160-165. probably should have let that wd sit for a bit longer, i sprayed it into the port and looked and didnt see anything then went on my way so its possible it could have creeped through and my tired bum didnt see it. Oh well, ill save up to get new heads, or get the right tools and do it mtself, im not going back to the shop with the heads and letting the engine sit out in florida humidity for three weeks. Ill deal with it when its gets unbearable like the last motor, the last one wasnt even holding 100psi with bad valves. Just a bit dissapointed i spent good money to get these heads done And they start looking like this after 7000 miles.

 

[lostranger2026]

I never had to rebuilt and I'm a weekend mechanic at best, however I'll give you my two cents, maybe they'll spark some ideas. I see that cylinder 6 has coolant/oil mix in it. I'm looking at the gasket as it's easier to check the gasket deformations to check where the humps are then to look at the block. From this angle it looks like the gasket deformed right along the edge between cylinder 5&6, so that's where I'd pay extra attention.

As for the roughness of the idle, I'd say that's an air intake problem with too little air being mixed in or too much fuel being injected because of a wrong air reading. Cold air contains slightly more oxygen then warm air. Could it be the MAF?

Note; really should have scrolled to the last page first

 

[NaomiTheNomad]

I never had to rebuilt and I'm a weekend mechanic at best, however I'll give you my two cents, maybe they'll spark some ideas. I see that cylinder 6 has coolant/oil mix in it. I'm looking at the gasket as it's easier to check the gasket deformations to check where the humps are then to look at the block. From this angle it looks like the gasket deformed right along the edge between cylinder 5&6, so that's where I'd pay extra attention.

As for the roughness of the idle, I'd say that's an air intake problem with too little air being mixed in or too much fuel being injected because of a wrong air reading. Cold air contains slightly more oxygen then warm air. Could it be the MAF?

I did find two of my fuel injectors had the baskets missing, i looked in the fuel rail and they weren't in there. And the injectors looked slightly different, like i was given bigger injectors on 2 cylinders, luckily i had extras that i replaced during the swap, they are functional, just were originals so i did that as a refresher. MAF was swapped two months ago because i suspected that was bad, had a slight improvement there. 02’s have crosses my mind at some point, if it is them im waiting for a code before replacing. (Edit) i do need to do my fuel filter soon, i replaced it last year due to a lean code and that fixed it, its been about 20,000 on a cheap duralast one because i was broke at the time so its likely due.