Question about Cars & Trucks
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Posted on Jan 02, 2017
SOURCE: my rx7 blows blue whight smoke
As a rule:
The test should show high and fairly close compression (100psi or more) on all cylinders. If any of them are significantly lower, something is allowing the gasses to escape. Since piston ring failures would produce blue smoke, not white, that leaves the head gasket.
If you feel comfortable doing it yourself, testers are available at any auto parts store for under $30.00. If you don't, any shop can do it in under half an hour.
All this is to pin point the problem. Then you know what you are dealing with.
Comment me back with your findings.
Posted on Feb 03, 2009
'07 cummins engines are not to smoke at all. Cold, hot or upside down. If its smokin, its broken is the motto. '07 's are common rail fuel systems. I think you may have the DPF and the DOC exhaust system needs looked at. If no codes, have the dealer double check with ENSITE or comparable programs to check the engines crank and cam possitiion sensors to make sure they have the same rpm. you could have one going out. If just at startup you have smoke, may just be valve seals leaking. Good luck hope this helped.
by the way unburned fuel is black not white, thats oil...
Posted on Dec 02, 2009
hmmm...This kind of problem usually is due to cam shaft/valve timing issues. Sometimes, the cam shaft is not properly positioned and is not in sync with the distributor thus the exhaust valves open early releasing unburnt fuel. This will cause the engine to definitely run bad.
I suggest that you try to adjust your engine's timing first (cam and distributor) and then see the results. Also, remember that there is a limit to the rpm that an engine must do- about 6,000rpm is enough for high or max hp. Another information, a camshaft will only work best at a given rpm range so if you run your engine too low or too high, the engine will not work properly. In fact, there are special cam shafts for engines intended to run at high rpm while sacrificing lower rpm levels (the engine runs grumpy at low rpm levels).
Worst case, however, is that white smoke sometimes indicates that oil enters your combustion chamber, this will cost an expensive rebuild if such is the fact.
Posted on Jan 17, 2011
SOURCE: my 94 cummins runs rough
yes it could be an injector, also check the fuel filter. when we see white smoke from a Cummings it is al-wise a lack of fuel, black smoke is to much fuel, white smoke is a lack of fuel, also there is a fuel enrichment diaphragm in the injection pump. it is located on the back of the governor housing ( there will be a line going from the intake to the governor housing cover ) remove this cover and check to see if there a hole in the diaphragm if there is replace it, here at work ,all we run are Cummings 4b's which is a 4cylinder version of your 6 cylinder and we replace 5 or 6 of these diaphragms a year and when they go bad the trucks smoke white and have no power. you also might want to check the injection pump housing pressure it should not be any higher then the fuel transfer pump pressure if it is you will need to replace the injection pump. just to let you know how common this is we keep 2 pumps in stock at all times hardly a week goes by that someone in one of our depo's is not changing a pump......good luck let me know if there is any thing else i can do for you.....THANKS for using FixYa
Posted on Jan 25, 2011
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i believe the engine is running too lean as if it was running too rich it would blow black smoke If it was blue smoke it is oil related eg valve stem seals,valve guides and or piston rings all of these things will create blue smoke if one of the above is worn out
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