This is topic major drop in mpg's any idea's why? in forum Tech Talk at Northern California Ford Owners  .


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Posted by 1989lx5.0 (Member # 3699) on :
 
89 lx pretty much stock i went from about 22 mpg to about 10 mpg fresh tuneup about 4 months ago only driven about 1 month out of the 4. it still runs good but a slight power loss what do you guys think, o2 sensers? cats getting clogged? or ?
thanks,
 
Posted by 93venom (Member # 778) on :
 
EGR valve
 
Posted by 1989lx5.0 (Member # 3699) on :
 
do you think its clogged or just bad is there any way to test it
 
Posted by Blue Oval (Member # 2548) on :
 
you could try cleaning it but new is alwalys good.the 02s are possible whens the last time they were changed?
 
Posted by 1989lx5.0 (Member # 3699) on :
 
never i have had the car for about a year put on about 20,000 miles
 
Posted by mike g (Member # 2919) on :
 
do you ever smell a fuel smell(fuel leak possibly)?
 
Posted by 1989lx5.0 (Member # 3699) on :
 
i have never noticed a fuel smell. that is something i will check tomorrow thanks
 
Posted by SFfiredog (Member # 3695) on :
 
make sure the thermostat is not stuck open.
If the engine doesn't warm up it will stay in open loop and the gas milage goes down the toilet.
This can also lead into overloading the cats with fuel and causing them to clog up and the engine will loose power.
HTH,
Mike
 
Posted by 1989lx5.0 (Member # 3699) on :
 
quote:
Originally posted by SFfiredog:
make sure the thermostat is not stuck open.
If the engine doesn't warm up it will stay in open loop and the gas milage goes down the toilet.
This can also lead into overloading the cats with fuel and causing them to clog up and the engine will loose power.
HTH,
Mike
i think you might have solved the problem i never thought of that this thing never gets hot and now that its getting cold the gauge dosent move at all, thanks for the help guy's ill try a thermastat, o2's and check out the egr i am going to be puting the spray to it real soon [burnout] so i need to make sure everything is ready
 




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