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Blue smoke, shaking engine, oily plugs...help!! |
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Ram Air Rick
Supporter of TheAMCForum Joined: Jul/04/2007 Location: United States Status: Offline Points: 2668 |
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Pull the plugs and check to see if any of the electrodes are bent.
I had a similar experience once ,and it wound up that something small,never found out what,was ingested into the carb.. Same exact thing as you described happened to me. And you did mention having the carb worked on.
Pulled plugs and found three bent plug electrodes. Looked further and found bent pushrods.
All cylinders effected were sharing the same plane in the intake,so it was figured that the whatever foriegn matter it was got pushed back into the intake and sucked into another cyl. till it screwed up three cylinders.
Hope this isn't your issue ,but thought I'd throw it out there.
Good Luck..
Rich C.
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budryzer
AMC Addicted Joined: Mar/15/2012 Location: Toms River, NJ Status: Offline Points: 758 |
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X2 on uncljohn's post. I too broke seven ring landings with the detonation issue. If all seems fine with your pvc and returns...... a compression test and a vacum test will reveal solid mechanical status. If they are good??? then you need to look for flaws, such as why or how oil is being introduced into the combustion chambers only on the one side of the block. Good luck.
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1968AMX Stroked 369
"UNCLE SAM" tribute 04 H2 04 BMW 325 A/W 95 Ultralight Hobbycopter 85 CR500 x 2 and 13 other open Class Bikes 77 Hercules Chinook Flt Lead Prev 1970AMX390/4spSonicw/mask&3Gremm's |
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mmaher94087
AMC Addicted Joined: Apr/01/2008 Location: Arizona Status: Offline Points: 1690 |
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"I had a similar experience once ,and it wound up that something small,never found out what,was ingested into the carb.. Same exact thing as you described happened to me. And you did mention having the carb worked on."
I got a nice '70 390 block free because a mechanic couldn't find one of the carb nuts. A head and a piston were toast but everything else was good. Mike
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Mike
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Nightmare2013
AMC Fan Joined: Jan/29/2013 Location: Astoria, Oregon Status: Offline Points: 24 |
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Thanks! I checked the carb and whatnot, I did the tuning but it was just changing the idle and choke. Been wrestling with that damn ps pump in the Tahoe and the waggy is sitting patiently.
Would risolene oil conditioner cause such a response? |
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SKeown
AMC Addicted Joined: Jul/30/2009 Location: Texas Status: Offline Points: 3085 |
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Are you saying all the plugs on one side are oil fouled and none on the other side?
SKeown
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Nightmare2013
AMC Fan Joined: Jan/29/2013 Location: Astoria, Oregon Status: Offline Points: 24 |
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Skeown, yes. Pull all plugs, driver side oil fouled, passengers side light tan. Pulled valve cover and gasket appeared either melted or it was a cheap rtv job. Rockers appeared fine, no bent or snapped bridges. I put into risolene oil conditioner about 40 miles ago before this occured. When driving no oil pressure drop and temperature was good, and my mystery misfire was gone, but now it shakes at low rpm (like driving over grates) and got blue smoke. Did not hear any pinging or detonation but I am deaf as anything. Didn't feel anything out of the ordinary before this occured either.
Btw tail pipe was black and wet when I got home. |
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73hornut
AMC Addicted Joined: Jul/03/2007 Location: Southern Oregon Status: Offline Points: 3130 |
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What do the valve guide seals look like? Have you replaced the cap and rotor?
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71 Javelin
74 Gremlin 79 Spirit AMX Rogue Valley Rumblers Like Us on FB https://www.facebook.com/groups/1602825606650796 |
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jcisworthy
AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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Intake gasket? Maybe it failed and oil is going directly into the ports. Pull the carb look in the intake runners and see if there is oil on the cylinder head port floors.
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SKeown
AMC Addicted Joined: Jul/30/2009 Location: Texas Status: Offline Points: 3085 |
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With the origional dual plane intake that makes no sense. If oil is getting into one port it should be dispersed to two cylinders on each bank to some degree. I would remove the intake and do a compression test, most likely something will jump out between those two things.
SKeown
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jcisworthy
AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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Thought he said all plugs on drivers side had oil so I figured it was easy enough to pull the carb and look for oil. Oil directly into the ports would smoke like he said and could the foul plugs which would account for the running rough and shaking.
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