Cut vacuum hose on my 300's carb?
09-09-2013, 03:49 PM
#1
Cut vacuum hose on my 300's carb?
I've been having issues with my 1983 f150 4.9l 300. it's been running rough, Ive got it timed right and the carb is adjusted and Ive fixed all the vacuum leaks I can find, i discovered a cut hose at the carb base that has a bolt in it. I have no idea where it should hook up and I think that could be the issue. Any ideas where it should attach. the hose is yellow if that helps.
09-09-2013, 07:22 PM
#2
Update: I was mistaken. The hose is red and at the top of my carb. It's just a straight through hole it's connected to. I did a tune up and pulled the bolt out of the hose and it smoothed out the idle. Still would like to know where it's supposed to be connected though.
11-01-2013, 07:16 AM
#4
Senior Member
I think what youre looking at is a return line from the exhaust. Look behind the 2nd converter where the exhaust turns back tword the tranny. There should be a pipe comming off the pipe back to the engine. Its possible your exhaust has been redone over the years. You may need to adjust the air fuel mixture some. Back in the day it was tuned as screw the screw all the way in then back it off 2 full turns. Tune from there out and in in small increments. Also check timing to verify its set at 10*.