1979 250 I6 Running Rough
#1
CF Beginner
Thread Starter
1979 250 I6 Running Rough
Hello, my 79 250 I6 starts easily, but runs rough until it is warm, and seems to lack the power it should have. When shifting, I am hearing popping (but not a true back-fire). Upon shut-off, it “diesels” a bit (engine chugging while the key is off).
This engine has vacuum lines running everywhere, and I replaced obvious cracked and broken vacuum lines, checked the PCV valve (it is ok). The exhaust smells like all the fuel isn’t burning.
Any thoughts on the next steps? I thought about new plugs and wires. It has 67k miles on it.
Thanks in advance.
KSBandman
This engine has vacuum lines running everywhere, and I replaced obvious cracked and broken vacuum lines, checked the PCV valve (it is ok). The exhaust smells like all the fuel isn’t burning.
Any thoughts on the next steps? I thought about new plugs and wires. It has 67k miles on it.
Thanks in advance.
KSBandman
#4
CF Monarch
Since you said it diesels when shut off, an engine/carb that old might not like what gas you are using. That would be the first thing I would look into. Rough idle might be something different, and I agree with replacing vacuum lines.
Trending Topics
#10
CF Monarch
What plugs are in it now, and are these the same direct replacement? Does the idle change with air temp, and as suggested by oldchevy, when cold, is the choke plate closed?
Last edited by kevinkpk; December 29th, 2018 at 1:23 PM. Reason: addition