I have an 86 pickup reg 2 wheel drive with a 22R and its a 4 cylinder. About a week ago it started running like crap and blowing black smoke out of its exhaust. Also a little bit of liquid was coming out. It doesn't run rough all the time it seems that when I get going for a little bit it will run normal and smooth but still blows a little bit of black out. I already replaced the spark plugs, plug wires, distributor cap and rotor. Cleaned the coil and igniter and when I checked the spark plugs they were sparking a yellowish color. I'm lost on what could be making it run this way and blow the black smoke out. Anyone have an idea?

 

Blowing black smoke indicates your running too rich, which may mean a carburetor rebuild is in order, but what also got my attention is that you mentioned your spark being yellow. It should be a blue/white color could mean a weak coil/igniter.

 

Yah I checked the ohms of the battery and its putting out 18-20 too. I don't know if maybe the altenator burnt up my coil and igniter or what. But you think my problem is the carburetor?

 

Good luck!

 

Lol yah... I don't know about rebuilding. But I think I'm gonna try the pick a part for a new one. There's nothing else it could be?

 

My '87 did that and it was the SAP (secondary accelerator pump) which is an easy fix. Google it as there is lots of info on how to check and/or replace it.

 

x2 ---^

On Auxiliary Accelerator Pump diaphragm leaking excessive fuel into the intake.

 

I read in my manual that to check it it has to be at a cool temp. So I'm gonna have to wait a sec. It says to pinch the line then release and shut off truck and if gas comes out of the valve(which I couldn't figure out where that was). Then repeat when the truck is hot and if gas comes out there's a problem. If I open it up what does it look like inside? Is there a gasket or anything I can damage?

 

 

Well we took and replaced the diaphragm in the aap but now it won't stay running. Gonna do a carb rebuild today! Wish me luck.. -.-

 

Well now it stays running. But it still was running rough. We took off the air filter and it ran fine. But ran extrely hot. I wonder if it could be the mixture control valve? Any ideas?