Belching blue smoke!

[paxton91]

My truck has had an random miss with it for awhile, a few thousand miles. I figured it was time for new injectors being these in it now are the originals that were rebuilt just over 100,000 mile mark. A few weeks ago I installed 185 Bosch injectors and it runs the same. Sounds no difference. Tonight I started the truck, it starts right up but sounds like it has air in the fuel system. This last maybe a minute then runs like its normal self, with a random miss. (This miss is not like I were to crack an injection line at one of the injectors. Not that pronounced but I can see the engine rock and hear it. ) So anyway, I jump into the truck take off and was about four blocks away when all of the sudden it starts to miss really bad or like it was not getting fuel and it wanted to died. I look at my right rear mirror and this thing is belching blue smoke! As I turn onto my street it dies, and now it won't start. I crack each of the injectors and fuel comes out when turned over but still no start. Will not even try to fire. Any ideas?

 

[Wayno]

You might want to check your lift pump . If I remember right mine acted like that once and it was the lift pump going out . I do remember that it was blowing blue smoke real bad and it acted like a gasser does when it is running out of gas .

 

[cerberusiam]

Could be the lift pump. Could also be the injection pump has finally given up. Mine did about the same thing when the injection pump gave up up. Intermittent missing and lots of blue smoke. If the pump is gone it can pump fuel to the injectors but the timing and delivery is so far off it won't start. You should be able to get a pressure gauge on the lift pump and spin the motor to see if it is developing enough pressure. Just don't crank it for more than 30 seconds and allow a couple minutes cool down time between tries.

 

[hdm48]

Here is something that happened to me.



The nut holding the gear on the pump came off and the grear came loose from the taper. When this happened, the timing key got sheared. The wiered part is, the pump would still turn and pump fuel making me think the pump was OK. And just like you, it belched lots of blue smoke because the timing was so far off. It would sound like it wanted to start but just couldn't quite do it.

I figured the KDP got me and started to open up the motor to fix it and stumbled on the gear thing. I was lucky.

You can look down the oil fill tube and see the nut. I think it's worth a look.



Good luck



Dave

 

[paxton91]

Thank you everyone for your input. At work all day thinking the worst, complete head rebuild.



I did replace the lift pump about a month ago. But that does not mean it is good or producing enough pressure. Things to do list after work tomorrow is find a fuel pressure gauge. Local industrial supply should have one.



I have on my list a new injector pump. Maybe it has moved itself up to the top of the list. Don't know why but I blamed it for the missing. I'll check that nut also and post my finding. Probably will be this weekend when I get at it.

thanks again



Daniel

 

[Clarkoh]

Easy to get a good look

If you want to get a wide open look at that nut, gear and end of the injector pump shaft. The whole oil filler tube(s) come off very easily. The upper piece is threaded in to the elbow piece and the elbow piece is threaded into the timing cover.

 

[CAROLINA CUMMINS]

Hope you get her fixed. I haven't ever seen any blue smoke, just gray. Can't seem to figure it out, it comes out BLACK- but instantly turns to gray. Definitly not normal.











Steve