Magnus604

Hey pal, you ever end up doing a write up about this? I have a set of 03-05 or so Escalade cooled seats I’d like to upfit to my 2000 silverado

Hey pal, I just dealt with a similar issue, minus the 02 sensor. Turn d out I had leak down happening with my fuel injectors. These engines are very sensitive to fuel pressure! Check that it’s 55-60 key on engine off, and 50-55 engine on. You can check additionally by pulling your fuel regulator vacuum hose while it’s running, should jump right up to 60 psi.

I’m sure you’re already done, but the 1500HD springs will absolutely bolt on to the 1500. I swapped my leaf springs for HD’s a few months ago. Capacity is just over 2000lbs, and raises your rear end roughly 1.5”

You’ve had some great reply’s on this. The Lm7 is a great engine, if you have the money to spend on it (lo and behold, 4K plus IS a lot of money to most), just beef up all your internals, these engines can take 1000hp+. Problem with going high horsepower, it makes the truck basically undriveable anywhere other than the track. If you want a high horsepower daily driver, you’ll want to max out around 450hp. This requires a LOT of add ons (ie cam shaft, lifters, springs, basically full internals, not to mention upgraded transmission, torque converter, high flow cats, exhaust, headers, cold air intake, fuel injectors, basically everything). If you don’t upgrade the whole drivetrain your truck will just rip everything apart from the extra power. ONLY two engines that will be direct swaps without dumping many many thousands into everything, are the LM7 (iron block 5.3 with 295hp at its best stock) or the L33 all aluminum high output (325 hp). Even swapping the Lq4 or Lq9(lq9 is better) 6 litre into your truck will need upgraded trans, as the 4l60e that was usually paired with 5.3’s can’t take the extra torque from those. IF you’re wanting to build a badass daily driver, boy oh boy you’re gonna be dropping some dollars bro! 4K will NOT cut it. A supercharger alone is MINIMUM 5-6k, and upwards of 10. The labour to have everything installed will probably be 5-10k (remember, literally everything around the engine lol). If you don’t want to have to spend 10-20k rebuilding a high hp daily, just do the gaskets, maybe drop a stage 1 truck cam, valve springs and a cold air intake for some easy hp gains that won’t go too expensive

If you’re having leak down it’s probably your injector seals. my 2000 Silverado had poor fuel pressure causing a hard start (turned over for several seconds before firing) and misfires in 1 and 7. I chased this for six months, replaced fuel pump twice, egr valve, the solenoid, the vapour canister, brought it to a shop (they replaced one injector, got rid of misfire for one month than came back). I ended up replacing all 8 injectors with remanufactured injectors, finally cleared it up. turned out I was having bad leaking seals in 2 injectors. these engine are very sensitive to low fuel pressure.