Hey everyone, So last couple times I've driven my car it seems to have a random misfire at idle, especially in gear, but when on the throttle I can't notice anything. My vacuum is a steady 19.5"hg and I can't seem to find any kind of vacuum leak. I grounded each cylinder to see if I could isolate it but no luck on narrowing it down. Any suggestions? Thanks, Ryan
Have o2 sensor and my idle is right at 13:1, but I have still tried bother leaning and richening up the idle
Bad set of wires? You can try filling a spray bottle with water and soaking the wires down. See if it get worse
I vote for a bad wire. How old are your wires? Or your cap could have a crack in it, and its full of carbon.
If it is really misfiring, you will absolutely see that on a vacuum gauge. Leave the gauge hooked up and tape it to the windshield, then drive the car.
Wires are relatively new and are MSD streetfires. Cap and rotor are all pretty new too and are accel brand. By pretty new I mean last year but very little miles on them. Cylinder balance was pretty good last time I checked all were right around 120 psi. And having a steady vacuum is throwing me off too. Initial timing is 12 degrees but I was thinking of playing with the timing to see of it helps.
I'll check compression again. The Holley I had on the car previously had the needle and seat get stuck so it flooded the engine pretty good and haven't checked compression since.
Well then you haven't looked at the plugs since either. Bet they are fouled. Check the oil for a smell of fuel. Might want to change it.
I have to agree, sounds like plugs. I badly flooded my engine once when a float got stuck. Drained the oil and it spilled out like water. Plugs we're black. Bet it gave the cylinder walls a nice shiny clean down too.
