HamHay
NAXJA Forum User
- Location
- Albany, NY
Gas leaking from exhaust manifold, cylinder #1.
1989 MJ, 4.0, 5spd, has been missing at all speeds lately. As per normal, block, head and valve cover areas nice and oily.
What I thought was oil at the exhaust manifold on the front-most cyclinder is actually gas. Pulled the plug and it was fouled with gas, checked the wire and it was OK, plug fires, too. All other plugs, wires, OK. Lots of carbon on the dist. cap posts, cleaned them, no change.
No smoke from tail pipe, backfiring, knocking and pinging or stalling.
Changed injector, and plug, no improvement.
Did a compression test with the following results:
#1 115psi (leaking cylinder at manifold)
#2 135psi
#3 140psi
#4 150psi
#5 150psi
#6 155psi
Doesn't look good, does it? Anyone have an idea of what I'm up against? The truck only has 62K miles on it, but as the second owner, I don't know how well it was maintained before I got it.
Any info or thoughts are appreciated.
1989 MJ, 4.0, 5spd, has been missing at all speeds lately. As per normal, block, head and valve cover areas nice and oily.
What I thought was oil at the exhaust manifold on the front-most cyclinder is actually gas. Pulled the plug and it was fouled with gas, checked the wire and it was OK, plug fires, too. All other plugs, wires, OK. Lots of carbon on the dist. cap posts, cleaned them, no change.
No smoke from tail pipe, backfiring, knocking and pinging or stalling.
Changed injector, and plug, no improvement.
Did a compression test with the following results:
#1 115psi (leaking cylinder at manifold)
#2 135psi
#3 140psi
#4 150psi
#5 150psi
#6 155psi
Doesn't look good, does it? Anyone have an idea of what I'm up against? The truck only has 62K miles on it, but as the second owner, I don't know how well it was maintained before I got it.
Any info or thoughts are appreciated.