1993 Honda Accord EX

[compguy786]

Hey People,
I have a 93 accord ex, i bought the car at 173,000 miles, and now have 198,000. I have had the car for a year..and now my gas mileage, and performance has dropped significantly. I get about 320 miles to the tank, versus 370 previous. I am down to 21-22 mpg compared to 27+ mpg. I have no clue what is causing all these problems....car mechanically seems fine, but something is hampering it. I think im going to do seafoam on the car soon...what you guys thing ?

Also, are radar detectors a good investment ?

 

[evident]

could be the yearly winter fuel mixture change(aka 10% less efficiency assrape) at the gas stations.

 

[compguy786]

nah...its been like that since june now

 

[woodie1]

Have you looked at your air filter and spark plugs?

 

[T2urtle]

did it just randomly drop. or did it go slowly down?

a failure in a sensor, broken vac line or something important could be it.

 

[compguy786]

1. Checked air filter, still is clean
2. spark plugs were changed in june, but i think i will change them again soon
3, no CEL, sensors seem fine, i think my cat is gone, because i hear a ratttling noise right near the firewall

before that, i was getting good mileage, the timing belt was changed last year, and other belts. i am using synthetic oil now as well.
I might change my air filter to a KN type.

 

[bamx2]

Have you adjusted the valves when due . Also try a DIY throttle body cleaning . Google for the Honda Accord enthusiast forums for info .

 

[LTC8K6]

I might change my air filter to a KN type.

That won't help any...

 

[compguy786]

i think my thermostat is shot
my engine was "cold" the whole duration of a 15 mile drive.....that is impossible.
prob going to change that then, and see what happens

 

[LTC8K6]

Yep, that'll make you use more fuel.

 

[compguy786]

yeah......
i got new stuff today
1 X thermostat
1 X KN oil filter
4 X NGK ZFR5 GP platinum sparkys
ordered a KN air filter
gonna seafoam it tomorrow
and change oil...

i think all this should do it.

 

[thomsbrain]

I'm guessing the thermostat was the cause. I had to replace mine in my old 91 Accord at roughly the same mileage as you.

 

[compguy786]

tomorrow im doing a full tune up
change all the above
and SEAFOAM IT !!!

 

[Kromis]

Do you *really* need a radar detector?

 

[compguy786]

hahah
why do you say ?/

 

[RU482]

had the same car a few years back, with the same problem.

changed the O2 sensor and spark plugs, and mileage went up.

 

[AMCRambler]

Another vote for air filter if the thermostat doesn't fix it. Also look in the airbox underneath the filter. I had chipmunks filling mine with acorns all the time. When I got it from parents there must've been like a hundred in there and they had been eating on the paper of the filter element. After that I checked it every time I did the oil and pulled out like 5 or 10 each time. I suppose I could've tried to get the intake out of the fender and put a screen over it but it was easier to just pull the acorns out frequently.

 

[Overgloc]

New Plug wire also.