P2150 and P0302 after getting gas

67firebird455 · January 7, 2023

@Karnut - I hear you. Was my first thought too, and still haven't entirely ruled it out. The P2150 and P0302 are gone now with the injector replacement, but the fuel ration imbalance between cylinders and the odd pressure/injector balance rates lead me to believe these are junk ass injectors even though they look legit. The eBay seller didn't even give any pushback when I asked if they were genuine GM injectors, they just immediately offered a replacement or refund. We'll find out when I get the set of 8 fresh ones from rockauto on Tuesday!

@Stonewood - That's the story of my life brother! I figure putting a bit of money in this pig beats a car payment! It's been paid off for 6 years now, and it's been a pretty solid family wagon. Borrowing my mom's mustang has reminded us how lucky we are to have this huge SUV!

Will update when we get a little further next week!

KARNUT · January 7, 2023

1 minute ago, 67firebird455 said:

@Karnut - I hear you. Was my first thought too, and still haven't entirely ruled it out. The P2150 and P0302 are gone now with the injector replacement, but the fuel ration imbalance between cylinders and the odd pressure/injector balance rates lead me to believe these are junk ass injectors even though they look legit. The eBay seller didn't even give any pushback when I asked if they were genuine GM injectors, they just immediately offered a replacement or refund. We'll find out when I get the set of 8 fresh ones from rockauto on Tuesday!

@Stonewood - That's the story of my life brother! I figure putting a bit of money in this pig beats a car payment! It's been paid off for 6 years now, and it's been a pretty solid family wagon. Borrowing my mom's mustang has reminded us how lucky we are to have this huge SUV!

Will update when we get a little further next week!

I noticed the 67 Firebird in your sig. My brother in law has original 69 convertible I found for him over 40 years ago. Do for another refresh after he retires in two years. He’s gathering pieces right now. It was his first car.

67firebird455 · January 7, 2023

Same here. I’ve had it for 24 years now. It was an old 6 cylinder sprint with a Saginaw 3 speed. The only upgraded option was deluxe interior. I got it from a friend, and it had a ‘75 Pontiac 350, with ‘76 455 heads (suuuuppperrrrr low compression) and an open 2.78 rear end. Turbo LS now, TH400, 9” rear. I love that car, but stupid expensive to work on. It needs a lot of love in the body department, but still a lot of fun to drive when I get the chance!

Stonewood · January 7, 2023

Went to the garage and did a quick wax/wipe down on my 18. Surprise! nothing broke and no mirrors fell off. I have 9 payments left. It's mostly garage queen. I place the daily commute miles on a 08 Camry.

67firebird455 · January 7, 2023

9 minutes ago, Stonewood said:

Went to the garage and did a quick wax/wipe down on my 18. Surprise! nothing broke and no mirrors fell off. I have 9 payments left. It's mostly garage queen. I place the daily commute miles on a 08 Camry.

Super nice truck man. We get a new car every 10-15 years and try and pay cash. I despise having a car payment. Wish I would’ve scored the 02 WS6 I had my eye on for my almost 16 year old son… I would’ve had a backup car (despite seating four) and not having to borrow mom’s 05 green convertible 6 banger mustang. Haha

For now, to get the entire family around, we’re using my ‘21 Duramax, but 3 wide in the back seat and two teenage boys gets a bit old.

Stonewood · January 7, 2023

I wish it had more horsepower. It's 5.3 is blah. But 21 mpg on the freeway is nice.

Stonewood · January 7, 2023

1 hour ago, 67firebird455 said:

Wish I would’ve scored the 02 WS6

Have you seen the back seats in one of these? Bout as comfortable looking as a 5 gallon bucket.

67firebird455 · January 8, 2023

29 minutes ago, Stonewood said:

Have you seen the back seats in one of these? Bout as comfortable looking as a 5 gallon bucket.

I actually had a 99 turbocharged 6.0 TA. It’s not exactly comfortable in the back seat, but boy are they fun, and they get crazy good fuel mileage!

67firebird455 · January 22, 2023

Update here. After replacing all injectors, both fuel lines, purge valve, gaskets... It ran great, for a day or two, then misfiring now on #4. Compression test on cylinders 2 and 6 showed 230 and 250psi, cylinder 1 showed 240, but poor old #4 showed 150psi. A leakdown test we ran tonight shows it's leaking through the valves on #4, so I've got my work cut out for me, and wife is pissed and looking at other cars.

Thoughts or recommendations from those who have gone with a non-AFM VVT cam/lifter swap?

Edited January 22, 2023 by 67firebird455

Stonewood · January 22, 2023

I'm sorry to hear this about your Denali.

I had to search non-AFM VVT cam/lifter to learn more about your issue.

Hopefully, you can your get your questions answered here on this board, but you may have to find a different discussion board.

With my limited mechanical skills, it seems that a valve job is needed on that one head.

Perhaps both heads should be serviced?

And then consider selling the vehicle.

My poor at best mechanical skills allows me to service and maintain my 1979 Wagoneer. It is nothing more than a hobby.

Edited January 22, 2023 by Stonewood

67firebird455 · January 23, 2023

We’re looking to pull the heads this week, and have both rebuilt. TSP L86 non DoD cam is all I can find that eliminated DoD, but retains VVT without a cam phaser limiter which requires even more tuning (good ol California, checking Cal IDs and CVNs now). $1200ish for DoD elimination kit with cam, plus whatever the heads cost to rebuild.

I already had to repaint the roof and hood because of trash clear coat, now it’ll be time to repaint the whole car because the doors and fenders up near the top are worn down to bare paint and are dull. This car man…

67firebird455 · February 2, 2023

Well boys and girl, I might as well have just pulled the damn motor out... It's literally stripped completely besides crank, rods, and pistons. Being that it's 4WD, we had to remove the rack and differential.

I ordered a complete DoD delete kit with a new timing chain, all gaskets and bolts from Texas Speed & Performance on 1/24 in the evening. I was told on the 30th that it was being packaged and shipped that day. Nope. I have a new oil pump, pickup tube, O rings, gaskets/seals/RTV, water pump, radiator hoses, and the heads rebuilt with new valves and BTR springs, but can't get TSP to ship the freaking order in a timely fashion, and am now hung up waiting with the pan off this L86.

67firebird455 · March 22, 2023

Hey all, me again. We finally got it all put back together and seems to be running great (except the occasional P0430). It's on the passenger side, the one that had the bad injector on one cylinder, then turned around and had a bad lifter on #4 on the same side. It wouldn't surprise me (with my luck) that all of that damaged that converter on that side. My friend and I datalogged for 1/3 of a tank of gas today after hammering on it pretty good a few times on the freeway, and no check engine light for low catalyst efficiency yet *knock on wood*.