silverado2000

I put the 6.0 in my truck back in 09, after 700 miles it lost all power one day. truck ran a 16.8... yeah f'ing slow. It idles fine revs good in N, but it shudders down low and has no power EVER. Wont even do a burnout. I have never got a check engine light or any codes

new partsall parts under 50 miles)
Knock sensor/harness
MAF
O'2s
several plugs
plug wires
new cam
valve springs
fuel pump walbro 255
fuel filter
injectors rebuilt all flow #42@58psi
different coils
new exhaust
coolant temp sensor(side of the block)
tried different tuners
all grounds cleaned
Compression is around 200 on all cylinders with a cold motor

(THE MOTOR HAS 9864 , MILES ON IT)

Im going to run diagnostic test on it tomorrow with a scanner, check the fuel psi, and adjust the valves. Im wondering if the evap system is messed up, or what. I have no idea what is going with this truck anymore, anyone have a recommendation of someone i could drop it off with to find the prob?

Gadgetized

iTrader: (9)

You said it lost all power after 700 miles. So it was running completely fine before that? What did the tuners say about this problem?

silverado2000

Yeah I floored it leaving a parking lot and it felt on it's face and never ran good again, my previous tuner said it was the knock sensors. I changed those with no luck, he then tried tuning it several times with no change in power and he couldn't tell me what was going on with the motor. I have changed over to my current tuner but I'll I have asked from him is a mail order tune cause I was waiting on my injectors. I'm going to logg everything and see what he says soon.

Atomic

iTrader: (42)

Check fuel pressure while running...how is your gas mileage?

silverado2000

Yeah I'm going to check it while it's running, I'm hopeinh to beable to see the gauge while driving. And mpg idk the trucks so slow and embarrassing I havnt got a chance to calculate it.

Atomic

iTrader: (42)

what I really would like to know if there has been a big change from when it ran well to now.

89LS1FOXER

iTrader: (47)

could have internal trans issue also, saying because you said it shudders?

silverado2000

The cam swap but that's been thousands of miles with it running bad, I swapped the new cam in thinking it had skipped a tooth or had some flat lobes but it was perfect. It literally fell on it's face one day like it had no timing at all. And I always was thinking the trans is on it's last leg but you can here it in the exhaust when it shudders.it will be crusing fine then it will spudder and you have to go from like 1/4 throttle to almost full to keep it moving. I'll try and post a video so you can see and here what I'm talking about. The main prob is around 2000rpm that's when it really misses and hick ups.

1FastBrick

iTrader: (17)

Need to look at the fuel pressure when this occuress sounds like its possibly loseing pressure. have you ever changed the external fuel filter under the cab???

sam5300

iTrader: (1)

sounding like a fuel issue, but i would think the tuner could see that....