0 compression on cylinders 2,3,4, but ok on others
I was looking for a Cherokee for my daughter to drive locally over the summer. finally found that was very close and seemed to be the right price. It's 98 Chili Pepper Red that has only had 1 owner. Very solid with 1 problem and I got it for $800. The 1 problem is that the engine won't run right. The previous owner said it was being drive on the highway and just quit. They hd it towed back to his house and he kept trying to get it started. He cut off the exhaust after the cat and said he got it to run but after a few minutes it would backfire and stall.
I already have a '99 that I have been through front to back. Did an in place rebuild to fix a cracked piston skirt on that one so pretty familiar with going through an engine. Have also changed the timing gears/chain in this one too so know how to do that.
Back to the '98. First step was doing a compression check. Cylinder 1 was ~110. Not a bad start considering it hasn't run in awhile and the battery is pretty weak. Cylinder 2:0, cylinder 3:0, cylinder 4:0. I go back and check cylinder 1 to make sure my gauge is still working. Get 110 on 1 again. Cylinder 5: 110, Cylinder 6: 110
I don't see any oil in the coolant overflow and I don't see foaming on the oil dipstick. Next step will be to drain the oil and coolant to see what those look like.
I was surprised by the 0 values. Does this seem like a head gasket problem, valve timing problem or cracked head problem?
I don't hear any clanging around from the timing chain so I doubt it's a jumped chain.
this is what I was thinking for next steps:
drain oil for a look
drain coolant for a look
get a leak down tester and try that (hoping I can rent one)
remove timing chain cover and look at valve timing
remove head and start looking at valves
I'm just a little puzzled by 3 cylinders having 0 compression.
Would appreciate any thoughts anyone has on this.