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THE timing on a 88 Comanche w/inline six cyl. is set at the factory and not adjustable.
This sounds like an earth problem check battery to chassis & chassis to engine earth connections also check earth to alternator best wishes
its a closed system, no cap. Add fluid to the plastic container. You can convert to an open system, but that's not cheap. www.jeepmj.com
sell it
i have an 88 Comanche and mine is on the driver side underneath the headlights, almost in the wheelwell
If a 1988 Jeep Comanche will not start even though there is spark and the timing seems to be correct and the fuel pressure is good, check the starter solenoid. Even though all the other factors are good, the starter solenoid might not be telling the starter to engage.
My problem on the 88 I was working on turned out to be the crank position sensor located on the driver side top of the bell housing.
The diagram to the alternator of a 1988 Sedan Deville can be found in the cars repair manual. It can be bought at an auto part store.
Last I heard, there was no such thing as radiator sealant in a commanche. If you have a hole, you need a new radiator. Try tightning down all the hoses first, though.
It could be the alternator.
Recheck the connections, you may have missed one, so its flapping about in the breeze.
Inside the alternator.Inside the alternator.