Question about 1993 Geo Prizm
I have a '93 Geo Prizm LSI 1.6 L with 84,000 miles. The car has been great since we bought in '94. Lately, I've had a significant loss of horsepower and the gas mileage is reduced. I had a complete tune up and that didn't help. I had to replace two cracked exhaust manifolds. My mechanic said the back pressure was high and changed the catalytic converter. That still didn't help. My rings look good and and I'm not burning oil. Any ideas?
Clean the mass airflow sensor (or replace it outright) and change your oxygen sensor. Those are very big contributors to fuel mileage. Also, verify that the new plugs are gapped correctly.
Posted on Aug 02, 2008
I to have the same issue.. I can floor the gas pedal and it has no horsepower. oil is clean and all but it acts like its being "held back" if that makes since..no check engine light so not sure if its a sensor or what but not a vac leak (i looked for that)..
Posted on Dec 15, 2009
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Posted on Jan 02, 2017
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