92 Geo Metro convertible running rich, hesitation. Bad mpg - 32-35. Comes and goes.
I have become very frustrated with this little car, I initially had oil leak from front main seal. So I changed timing belt, cam seal and crank seal, set timing and it got a little better temporarily. Would come and go, replaced wires and distributor cap, got better... for a week. Then noticed leak at distributor mount, aha.. PCV plugged big time.. Replaced. Got better for a day. unplugged coil wire.. replaced got better then 24 hours later same, replaced all wires, it got better then worse. Running cold initially good acceleration, good idle, runs great. Warms up runs like you know what. So I cleaned the Mass Air flow sensor, ran great, then went to you know where.
Thinking one of a dozen things.. TPS, EGR, Fuel filter, burnt exhaust valves,etc. ran some seafoam through the throttle body ran better then worse.
My mother in law drove it for 15 years gave it to us with 67,000 miles, I drive it too and from work 60 miles round trip. interstate some country road, so it has some demand. Now has 107,000 miles just 15 months later. Am I just driving it too hard? Rarely take it above 65, most times running 55-60 even on interstate.
Last year it was getting anywhere from 36-42 mpg, this year lucky to see 34 mpg. Have loud exhaust, probably from a hole at muffler inlet hard too tell, I did have the resonator taken off and replaced with straight pipe but that was right after we got it due to an exhaust leak that was smelling up the interior.
Any help would be appreciated. Hope Joel see this I have read a lot of his stuff and he seems to have an insight.