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Engine smoke #2730095
01/04/20 07:45 PM
01/04/20 07:45 PM
Joined: Feb 2009
Posts: 773
Crofton, Ky.
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rattler Offline OP
super stock
rattler  Offline OP
super stock
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Joined: Feb 2009
Posts: 773
Crofton, Ky.
My 5.7 hemi swap has me puzzled. The engine doesn't smoke at all on startup,but once it comes up to temp, it starts smoking out the left bank. I never saw this engine run before the swap. I replaced the heads and one piston/rings due to two dropped valve seats. The cylinder walls in all cylinders looked great with some factory crosshatch still visible. I also have a miss, but how do you find it in a computer controlled engine? Will a scan tool tell me witch cylinder is not firing? I don't have much experience trouble shooting computer controls. Help.


1957 Dodge truck, Snakeskin Green with a little stroker motor. 1964 Plymouth Savoy wagon ( my new project)
Re: Engine smoke [Re: rattler] #2730192
01/05/20 09:05 AM
01/05/20 09:05 AM
Joined: Jan 2003
Posts: 7,489
Tulsa OK
Bad340fish Offline
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Bad340fish  Offline
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Joined: Jan 2003
Posts: 7,489
Tulsa OK
Unplug injectors while it is running, see which one doesn't make a difference. You can do the same with the coils with no worries of getting lit up lol.


68 Barracuda Formula S 340
87 "Chrysler" Conquest
Re: Engine smoke [Re: Bad340fish] #2730327
01/05/20 04:03 PM
01/05/20 04:03 PM
Joined: Oct 2018
Posts: 124
Conroe , Texas
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iapco103 Offline
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iapco103  Offline
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Joined: Oct 2018
Posts: 124
Conroe , Texas
smoke? or steam? correct diagnosis will depend on what is coming out the tailpipe. Paul

Re: Engine smoke [Re: Bad340fish] #2730358
01/05/20 06:16 PM
01/05/20 06:16 PM
Joined: Feb 2009
Posts: 773
Crofton, Ky.
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rattler Offline OP
super stock
rattler  Offline OP
super stock
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Joined: Feb 2009
Posts: 773
Crofton, Ky.
Well, I found the cause of the miss. I made a rookie mistake on this engine. Number 3 intake pushrods was not in the rocker pocket. I ran a compression test and was surprised to see no compression in that cylinder. Pulled the valve cover and found my mistake. The smoke started clearing up after it ran for a few minutes. But, I think I might have thrown the computer into limp mode. Ranking it with the coil packs laying on the intake while I was cranking it to check compression. Starts fine, but doesn't want to rev over 1200 rpm now. I'll deal with that tomorrow.


1957 Dodge truck, Snakeskin Green with a little stroker motor. 1964 Plymouth Savoy wagon ( my new project)






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