X15 2450 low power high fuel consumption

[Will144]

(12-04-2023 )tree98 Wrote:  Watching your egr open and close with insite isn't going to tell you anything at all. The ECM uses a series of tables to calculate what it wants from the EGR valve and you aren't going to be able to make heads or tails of it.

Your higher fuel consumption could be a LOT of different things. Have you done an injector leakdown test with insite ?

You also need to pressurize the entire engine(block off both sides of the turbo and put 30 psi of shop air into the cold side) to check for boost leaks.

What's your regen history look like in insite? Is it trying to regen constantly? This can consume more fuel than usual.

You said you found evidence of coolant when you removed the DPF. Your DPF could be weaker now depending on how much coolant has gone through it. Liquids wash away the precious metals and make the engine regen more often, which like I said will cause higher fuel consumption than normal.

I gotta ask........ are your tires low on air? Brakes hanging up?

The egr part, I wasn't sure if that was normal. Not knowing exactly how it works. My speculation it was maybe pulling to much exhaust pressure thus acting like a leak.

I went back to the truck today and did the injector leak down test again. It lost about 200 psi in 2 min.

As far as pressuriziing the system I will have to get a better plug system. I was able to remove the cross over tube pull the intake cross heads and pressurize to 25 psi (its a homemade tester made of pvc so I'm a little scared of it. Lost pressure very slowly. I believe at the clamps, they were the only thing that bubbled with soapy water. Today I plugged the exhaust and egr pipe with plumbing plugs and shot air into the exhaust back pressure port on the manifold. One joint on the exhaust manifold had small bubbles, the old manifold was much worse.

Regening at a little over 100 hours apart. The last regen, 2nd since cleaned, was 1103 intake temp1098.3 outlet temp with 1.9 differential pressure.

Double checked tires 125 on steers 100 on drives. I did forget to shake the calipers today, but I do on a regular basis so I don't think they're hanging up.