intermittent black smoke and power loss

[odie]

Hi new here,I have a 1998 k1500 s truck.180000km, all stock,Have started to have problems with loss of power and black smoke.seems to happen when engine is up tp operating temp,but doesnt do it all the time .Have changed wastegate control solenoid,but didnt help,no other problems, idles fine starts good,no codes,have 15-17 inches vauum at wastegate actuator,but cant tell if boost is dropping while driving.ordered boost gauge,will be here next week,any ideas what could be happening?oil conumption fine no coolant loss,any ideas would be appreciated.

 

[Mudbath]

Hi new here,I have a 1998 k1500 s truck.180000km, all stock,Have started to have problems with loss of power and black smoke.seems to happen when engine is up tp operating temp,but doesnt do it all the time .Have changed wastegate control solenoid,but didnt help,no other problems, idles fine starts good,no codes,have 15-17 inches vauum at wastegate actuator,but cant tell if boost is dropping while driving.ordered boost gauge,will be here next week,any ideas what could be happening?oil conumption fine no coolant loss,any ideas would be appreciated.

Welcome to the Truck Stop. Black smoke is usually tied to a turbo issue. The vacuum gauge will be helpful if you can run it into the cab seeing that it is an intermittent problem. When it happens a quick glance at the gauge should tell you if you have lost vacuum to the actuator. If so then move the gauge back to before the solenoid to see if it is lost there too. I would also try with vacuum gauge hooked up and under the hood to flex all the vacuum lines from the pump to the actuator. Plastic connectors and brittle vacuum lines break and cause vacuum lose.

One last thing is be sure your air filter is clean, black smoke is cause by not enough air for the given amount of fuel. Good luck.

 

[odie]

thanks will try your suggestions

 

[vegtech]

sounds like a bad ground

 

[Brooklyn Tow]

sounds like a bad ground

X2.....You replaced the the WG solenoid, but it sounds like you have sparadic power loss to the solenoid.

Same problen I had when the WG solenoid plug/wire was bad.....She would just loose contact and WG would be left in the open position untill she powered back up, closing the WG.

2 Cents