1976 slant six 225/904 all stock.
About two weeks ago I had to take a trip on the highway at around 60 mph for 30 minutes. Once off the highway at the stop light she began running rough at idle. Never shut off on me but a distinct hiccup and I can distinctly hear it popping through the exhaust when idling. It happens mostly in Drive or Reverse, not so present in Park on Neutral.
It’s been like this for two weeks as I use my car almost daily and haven’t had a day off to look into it, because once it’s driving it’s just fine.
Tonight I went to check the timing and to my surprise I can’t check the timing. Number one cylinder is firing so erratic that I can’t get a steady strobe stream off the light. Number one cylinder is misfiring bad.
I did check the strobe output on all other cylinders and they were a steady flash stream.
New wires, cap, rotor and it still does it. So I changed the spark plug and it’s a little better but still popping and misfiring.
Should I re-lash the valves? I did them about two months ago and had no problems till my highway trip.
Any and all suggestions appreciated.
About two weeks ago I had to take a trip on the highway at around 60 mph for 30 minutes. Once off the highway at the stop light she began running rough at idle. Never shut off on me but a distinct hiccup and I can distinctly hear it popping through the exhaust when idling. It happens mostly in Drive or Reverse, not so present in Park on Neutral.
It’s been like this for two weeks as I use my car almost daily and haven’t had a day off to look into it, because once it’s driving it’s just fine.
Tonight I went to check the timing and to my surprise I can’t check the timing. Number one cylinder is firing so erratic that I can’t get a steady strobe stream off the light. Number one cylinder is misfiring bad.
I did check the strobe output on all other cylinders and they were a steady flash stream.
New wires, cap, rotor and it still does it. So I changed the spark plug and it’s a little better but still popping and misfiring.
Should I re-lash the valves? I did them about two months ago and had no problems till my highway trip.
Any and all suggestions appreciated.