1993 Chevy S-10 Poor Fuel Economy

PHASE181

MEMBER
1993 CHEVROLET S-10

Engine Performance problem
1993 Chevy S-10 4 cyl Two Wheel Drive Manual 160000 km.

Hi there, I have a '93 S10 pickup truck 4 cyl and I'm noticing very poor fuel economy for a small engine like this. I believe I'm getting just under 200km to 42L of fuel and I've done a tune up on the engine - new plugs, wires, cap and rotor. The catalytic converter is off now and a new muffler has been put on. Any suggestions to check would be greatly appreciated!

3 Replies

BLACKOP555

MECHANIC
10,371 POSTS

Have you changed the fuel filter?

Also check out the o2 sensors, especially if you ever had a headgasket or intake manifold leak.

Could also be an exhaust leak or a vaccum leak causing this.

No check engien light im guessing? Tires properly inflated? New air filter?

How much decrease in mileage have you noticed, and did it gradually go down?

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Sunday, December 28th, 2008 AT 6:21 PM

PHASE181

MEMBER
2 POSTS

Thanks for the insight I have changed the air filter and fuel filter recently tire pressure etc all good and the mileage has never been good since I bought the truck only about 7-8 months ago. I haven't thought of the o2 sensors yet but I have been told that the MAP sensor may also be causing this so I will change it soon. The check engine light does come on until it warms up significantly then it goes out, I tried to pull the codes with a cheap code reader but had no luck. Recently my oil pressure guage has been dipping down to almost zero when I idle not sure what that's about.

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Monday, December 29th, 2008 AT 7:59 PM

BLACKOP555

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Try taking it to an autozone they will scan it with a scanner that is not a cheap one more then likely.

You should have the map tested before replacing it as it isnt a very cheap part.

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Tuesday, December 30th, 2008 AT 9:22 AM