UNDERDOG wrote:One thing I have found is the thermo valve that sits on top of the thermostat housing. My issue was am idle that hunted up and down at a stop once it was warm, and ran rough at a cold start.
If you are having gas milage issues, the cheapest and easiest fixers are the air filter and deffinetly the fuel filter. I would replace both of these at least every 30,000 miles! The fuel filter is on the inside of the frame rail, passanger side, and the postion should be where the rear bench seat is at.
JBH1989 wrote:That actually makes a lot of sense. How much do those run?
It's the Auxiliary Air Regulator = fast idle when cold.foo wrote:4. Whats this big thing?
Mine has one but I have yet to identify the gizmo. ???
james.oco wrote:I have an 89 Trooper 2.6l that idles pretty rough and I'm guessing that my poor gas mileage problem is related to that. I have replaced the spark plugs, distributor cap, air filter, and have attempted to adjust the idle speed(which did not respond well). It's almost as if I can hear an air leak in the engine compartment near the fuel injectors while the engine is running, though I'm not sure. I've replaced and looked over the vacuum hoses, though have found no problems there. I hooked up a tach and unplugged each spark plug wire one at a time to make sure that each cylinder is contributing equally and to see if an injector may have been clogged as well though everything seems normal. Engine only has 40,000 on it. Any suggestions?