jeepcherokeethng
NAXJA Forum User
- Location
- Salisbury, NC
Back ground info
Rebuilt HO 4.0 with approx 70000 miles
Engine has been studdering
Replaced cap, rotor, plugs, wires which needed changing
Checked map, tps, coolant temp, dist pick-up
Issue jeep has been studdering some under light load (crusing) but not all the time, and lifters/valves seem to have gotten noticeably louder in the past few weeks. So not really knowing what else to do me and my brother (graduate from wyotech automotive school) pulled the head. We noticed oily intake ports in the head. Center ports were worse. When i changed the plugs they looked a good color but was changed when missing first started.
When we rebuilt the engine from what i remember the head got new valve stem seals and normal overhaul but no new valve guides. Could the guides be worn allowing the oil to be sucked into the ports and sometimes not allowing the valve to seat fully/correctly.
I have read posts about pcv valve being clogged and all that jibberish but no sign of that being the issue.
Any ideas before i send the head to the machine shop to be checked???
Rebuilt HO 4.0 with approx 70000 miles
Engine has been studdering
Replaced cap, rotor, plugs, wires which needed changing
Checked map, tps, coolant temp, dist pick-up
Issue jeep has been studdering some under light load (crusing) but not all the time, and lifters/valves seem to have gotten noticeably louder in the past few weeks. So not really knowing what else to do me and my brother (graduate from wyotech automotive school) pulled the head. We noticed oily intake ports in the head. Center ports were worse. When i changed the plugs they looked a good color but was changed when missing first started.
When we rebuilt the engine from what i remember the head got new valve stem seals and normal overhaul but no new valve guides. Could the guides be worn allowing the oil to be sucked into the ports and sometimes not allowing the valve to seat fully/correctly.
I have read posts about pcv valve being clogged and all that jibberish but no sign of that being the issue.
Any ideas before i send the head to the machine shop to be checked???