25 mpg

[bhazard]

How bout you let me have the car since its obviously not perfect enough? ?? ? ?

[neanderpaul]

It's going to Canada for a heart transplant.

If I had solved this issue before my road trip I would have saved about $65. That's enough to gripe about and try to solve.

[Damkid]

It's going to Canada for a heart transplant.

:evil4::evil4:

[neanderpaul]

[JohnGunn]

93 Auto. Was getting 33 in town, highway ac no ac. Took it on a road trip. Ran it hard. I.E. floored up mountains. Started getting 25 mpg. At that same time developed a slight miss - slight rough idle. No loss of power. New in the past 5000 miles: oil, oil filter, fuel filter, air filter, plugs, wires, dist. cap, rotor button.

So is this the O2 sensor? Maf? How do I test those things? Something else?

Just took this occasion to re-read the whole of this thread. Interesting to observe that for me the more obscure the problems seems to be, the more interesting it becomes.

Since my original suggestion -- to replace your plugs, even if you are sure they're alright -- I have come to believe that the failure of my Bosch Fusion plugs with less than 5,000 miles had been due to my having used too much anti-seize on them. I had basically filled all the threads and screwed them in. All that extra compound was pushed up to engulf the washer and, I suspect that acutely restricted current flow and heat exchange away from the plugs. If this sounds like something you might have done, clean the plugs and try again or just replace them, using no anti-seize or much less.

Since your problems started after a grueling run up mountains at full throttle, do you recall whether the engine overheated during that trip? In that case, your thermostat, under extreme stress, might have gotten pushed out of position so hard that it no longer moves freely, e.g. that it no longer is able to fully close. In that case your engine might be running too cold and making your computer think it is still warming up and in need of extra fuel.

The mileage on my 5-speed Aspire is not what I think it should be and I've begun to suspect my thermostat. Here's what makes me think that.

I live in San Diego, where it never gets really cold, but I've noticed when cruising on cool nights that the temp. gauge will drop considerably. My thinking is that with the temperature no lower than 50 degrees the temperature of the engine should be better regulated to the point at which the thermostat fully closes. If your temperature gauge acts anything like mine does, maybe you should consider replacing the thermostat.

In any case, please don't give up. There is an explanation. One that will probably make you want to hit your forehead with your open palm.

[bhazard]

Actually I wonder if you might have burnt a valve or something.

Check compression at all?

[Movin]

leaky injector

[tripod808]

I know this is an old thread and I'm not sure if your problem has been solved, but I would look for a vacuum leak.