22R88

My 1988 22R reg cab seems to be rich. I say this because when it is idling, the fumes are fairly stout. I recently bought this truck back from my neighbors. Before I sold it in 2002 a buddy of mine ( Toyota Tech at the time) did a Timing chain, valve guide and we installed a 286( I think) Competition cam. I know that it was mild cam nothing radical. He also re- jetted the carb. The engine runs fine and starts easy, it just seems to be rich. I checked the the mixture screw and it was a little over six turns out, so I set it to 3 and half turns and tuned it per the manual then set the idle to 750 RPM. It still seems rich. Could something in the carb be bad like a rubber diaphram ? The carb has never had anything done to it other that the jet. I am just hesitant to tear it apart as it runs fine. Any help or tips is greatly appreciated.

Thanks,
22R88

22R88

ttt !! Any ideas. I have verified that the choke is 90 degrees up and down.

Kiroshu

Sure its not leaking gas anywhere? Whats the timing at? The 22r naturally runs a little rich but so much as to where you can smell gas. Check oil? Gas in the oil? Prob leaking fuel pump diaphram....