AC burning oil I'm clueless
#1
AC burning oil I'm clueless
My buddys 94 inline 6 now my parts truck. Any ways when u would run the AC it would blow black smoke like a diesel and motor go to knocking like it's got no oil check it and it's low. Don't run the AC an it never smokes. It makes no since to me at all. Any ideas?
#2
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#5
Try the computer thing, but another thing that makes no sense is that blue/grey smoke is oil, black smoke is fuel. If the A/C compressor did put a load on the engine and the computer is overcompensating, that could explain excess fuel consumption.. But not oil usage. I am curious. Wish this was something I could physically look at.
#6
#7
Unplug the wire to the compressor clutch--two pin connector that plugs in right behind the belt pulley on the compressor. Then start the truck and turn the AC on like usual. The compressor won't run and system will not get cold, but it will still send the idle speed change to the computer and run the HVAC fan inside the truck. If it still does the same thing as before, then you know it has something to do with the electrical signal to the computer from the AC controls since the compressor is not running.
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#8
If that test reveals that the truck runs normally with the AC turned on, but the compressor disconnected, my guess is you have an overheating problem. Have you checked the water temp when you are running the AC and experiencing this heavy smoke problem? The AC puts extra heat load on the cooling system, and if there is a problem that makes the system marginal, then turning the AC on could put it over the edge and cause overheating.
#9
If that test reveals that the truck runs normally with the AC turned on, but the compressor disconnected, my guess is you have an overheating problem. Have you checked the water temp when you are running the AC and experiencing this heavy smoke problem? The AC puts extra heat load on the cooling
system, and if there is a
problem that makes the system
marginal, then turning the AC
on could put it over the edge
and cause
overheating.
system, and if there is a
problem that makes the system
marginal, then turning the AC
on could put it over the edge
and cause
overheating.
#11
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