Join Date: Sep 1999
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Re: 2.8 V6 timing
Have you eliminated the possibility that the choke might be sticking closed or that the choke electric heater connection may have come loose. Also worn spark plugs could cause rich running and lousy gas mileage.
I check the manifold vacuum with the engine warm with a gauge connected directly to the manifold. On the Cherokee with a 2.8, an easy place to connect the gauge is in the supply hose at the vacuum cannisters on the passenger side of the engine bay. My 1986 2.8L Cherokee with auto trans and 4.10 axle gears gets about 15MPG city and about 20 highway. It currently has 130k miles on it. When I check vaccum at the mainfold I get about 17.5 - 18" with steady needle at operating temp idle. Good luck!![img]/wwwthreads_images/icons/smile.gif[/img]