grundan
NAXJA Forum User
- Location
- N. Alabama
well, I ask this in another thread and have searched and couldn't come up with another situation like mine. here goes it, 87 4.0 5spd. 220kmiles.
1.all new plugs (champion and autolite) put both sets in. makes no difference.
2.new plug wires
3.checked the cps with ohm meter. about 230 ohms...BTW freakin haynes manual has a misprint on that page. 6-20, says it shoud read open (infinite)
couple trips to parts store checking some new CPS revealed this
4.engine has a continuous backfire thru the intake from the #4 cyl.
5.when I take the wire off #4 it stops the backfire and runs good(less the #4)
6. compression is 92 on #4, didn't leak down after about 3-4 minutes.
it is like that cylinder is firing when the valve is open. any ideas?
1.all new plugs (champion and autolite) put both sets in. makes no difference.
2.new plug wires
3.checked the cps with ohm meter. about 230 ohms...BTW freakin haynes manual has a misprint on that page. 6-20, says it shoud read open (infinite)
couple trips to parts store checking some new CPS revealed this
4.engine has a continuous backfire thru the intake from the #4 cyl.
5.when I take the wire off #4 it stops the backfire and runs good(less the #4)
6. compression is 92 on #4, didn't leak down after about 3-4 minutes.
it is like that cylinder is firing when the valve is open. any ideas?