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PostPosted: Sat Jul 29, 2017 1:39 pm 
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Joined: Mon Sep 05, 2016 3:21 pm
Posts: 3
I have a 79 Luv 4X4.

Recently Rebuilt the stock Carburetor and removed EGR system. Before I rebuilt the carb i couldn't get the truck to idle below 1200RPMs not matter what I did. I did remove the vacuum advance and set the timing so I know that I could at least get it in the ballpark. So i know timing is good.

Now it will idle low enough for me to adjust and set the carb. After the carb is adjusted properly The truck will be idling at its normal 900RPMs, but then it will randomly begin spewing smoke and idling very rough at like 600RPMs barely staying running and continues to run rough even at high RPMs. I shut the truck off and restart it and it will go back to idling smoothly at the 900RPMs.

Any idea what could cause this??


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PostPosted: Mon Jul 31, 2017 9:18 pm 
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Joined: Mon Sep 05, 2016 3:21 pm
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UPDATE

Engine is now doing it all the time. It is definitely missing and there is a lot of black smoke. Prior to this I had replaced cap,rotor,points,plugs,wires,ignition coil, and I also rebuilt the carburetor.

Any ideas on how to proceed with troubleshooting this?

Thanks


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PostPosted: Tue Aug 22, 2017 7:36 am 
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Joined: Fri Jul 17, 2015 2:49 pm
Posts: 113
Definitely a vacuum leak somewhere, try to check the base gaskets of the carb, as that very well may be the problem. Also check the EGR under the intake manifold as this could be a culprit too

_________________
Yellow 74 LUV. Factory a/c
Blue 79 LUV. Factory a/c almost there
Silver 78 LUV. California emissions donor car now gone :(
White 79 LUV. Factory a/c

My trucks run perfect 60% of the time all the time 8)
Tucson, AZ


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