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Truck shakes when started, smokes blue, lots of blow by

Don't know exactly what's wrong. My check engine light came on and my code reader read PO147 which was a fuel delivery error. I changed my fuel filter right away and it seemed to run a little better right away. The truck still however smokes blue and shakes when started. I took it to a shop for a quick look and they figured I may have a hole in a piston cause of the blow by. Couldn't get the cap off when I picked the truck up, probably shouldn't of picked the truck up because of that. Could this be an injector? Truck seems to run fine once it's warmed up. Is there anything I could use to clean my injectors myself? I've tried running fuel conditioner (sea breeze), maybe it wasn't as great of quality I heard it was? Do you have to pull the injectors to test them? Thanks, Kelly.

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  • Kelly H
    Kelly H Mar 31, 2014

    Problems with my 2007 Dodge Laramie 5.9 diesel

  • Bobby Shropshire Jul 02, 2014

    Has the shop down a leak down test and compression check on the engine? If you have a hole in the piston your compression on one cylinder should be really low. My guess would be piston rings are bad causing oil to bypass the piston and be burned(blue smoke)



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Code p 0147 refers to heated oxygen sensor(HO2S) 3 bank 11 heater control---circuit malfunction====causes wiring--HO2S--- ECM
forget the hole in the piston statement as you say that it runs fine when warmed up
if there was a hole it would have a big miss at all times
shaking when starting indicates a misfire problem and running well indicates that the misfire is a problem injector
pull the injectors and have them professionally cleaned and adjusted
the smoke is from oil getting into the combustion chambers and it indicates failed valve stem seals allowing the oil around the valves to leak past the stems into the chambers on shut down
you should have a compression test done to determine ring condition and wear of the engine
Don't take it back to that shop as the hole theory indicates that they are not listening to you and have little idea of what they are doing
take it to an accredited professional service center that has experience on your make of vehicle

Posted on Mar 19, 2017

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Blue smoke on starting is a sign of oil in the engine cylinders. .
Excessive fuel would be black smoke on starting. I am concerned that it happens when starting. This is an indication of a valve issue. Bent, broken, bad spring, wallowed guides. This repair is not going to be cheap. Only way to know for sure is either a compression test or leak down test.

Posted on Mar 19, 2017


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