spetch
Full Member
I have an intermittent misfire problem. Scanner shows misfires come and go on #2 and #7. In each sample, the number of misfires changes, but #2 and #7 are always exactly the same number. That's too coincidental for me. Based on Sperry's explanation of how misfires are counted by measuring engine rpm variations throughout the rotation, I am suspicious.
I can't think of anything that is common to these two cylinders that would cause identical misfires.
#2 fires right after #7 in the sequence. Is it possible I only have a misfire on #7, and that the scanner is just seeing #2 as a misfire because it takes a while for the engine rotational speed to recover when #2 fires?
BTW, the misfire goes away for a while everytime I go in and remove and reinstall the wires. The wires look good, visually. I went and bought one new wire. I'm waiting for the misfire to come back, then I'll replace the #7 wire and see if it stops. If not, I'll move the new wire to #2 and check again.
I can't think of anything that is common to these two cylinders that would cause identical misfires.
#2 fires right after #7 in the sequence. Is it possible I only have a misfire on #7, and that the scanner is just seeing #2 as a misfire because it takes a while for the engine rotational speed to recover when #2 fires?
BTW, the misfire goes away for a while everytime I go in and remove and reinstall the wires. The wires look good, visually. I went and bought one new wire. I'm waiting for the misfire to come back, then I'll replace the #7 wire and see if it stops. If not, I'll move the new wire to #2 and check again.