Hi everybody, I'm new to the forum, and I'm the owner of a 87 Toyota pick-up, 22R (carbed), 2WD, that has about 104K on the odometer. Anyway, my truck has never really given me any trouble until about two or three weeks ago when It started skipping and blowing out black smoke when its warming up in the morning, yet running fine once it warms up. After I changed out the PCV valve, the smoke went away, but my engine still sounds like its skipping. Well, about a week done the road, the problem came back, so I changed my plugs+wires, cap+rotor, oil+filter, and blasted the PCV valve with some Carb cleaner, and once again, the problems gone, but my engine still skips when its warms up. So is it a timing problem? Or possibly a sticky valve? Or did the shot PCV valve just foul ou my fuel system?

Any comments are appreciated

 

Check the auxillary acceleration pump on the side of the carburetor. It can cause it to run rich and smoke. I do not see how a PCV valve could pull in enough oil to make lots of black smoke since it is on the top of the valve cover with a plate below it. By skipping, do you mean it misfires? Does it do it all the time or just at idle? How did the plugs look?

 

Thanks for the input. I'm assuming that it was the PCV valve, since the problem stopped as soon as a changed it, (the valve wasnt making a clicking noise when I shook it, so I figured, what the hell, its a 3$ shot in the dark, so might as well) but now its starting again, just not as bad. As for the "skipping" what I mean that its misfiring, but only when its warming up, and once its warmed up, it runs just as good as it always has (infact better since I changed the plugs,wires, cap and rotor). When I pulled the old plugs out, there was some carbon fowling, and I was planning to check the new ones I just put in by the end of the week.

So at this point, I've ruled out a sticky valve, or a bad valve seal, since it doesnt burn oil ever, and there arent any oil deposits on the plugs I pulled out of it. And since its black smoke that wreeks like gas, its definately running rich when it warms up, so it has to be a problem with my fuel system, I just dont know where to begin. Another thing I was wondering is if it could be a fuel sensor, or at least thats what the guy at nampa auto told me, but then again, he did sell me the wrong oil filter twice, and plug wires for a V8.

 

A carbureted 22R does not have a fuel sensor that I know of. If the smoke smells like gas then it is a fuel problem. It sounds like it is the auxillary acceleration pump to me. It is where that vacuum hose connects to the carburetor above all of the temperature senders behind the thermostat. A BVSV controls it, so when it warms up it shuts off. Just unhook and plug the vacuum hose going to it and see if it runs an better.

 

Awsome, thanks for the help, I'll probably get to that tommorrow when I got some time before work.

 

time to give it a 'seafoam' treatment.
carb rebuild after that

 

Hmm, a carb rebuild. Where's a good place online to pick up a rebuild kit, and how long would it take to get it done, if need be?