Question about 1993 Geo Prizm

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1993 Geo Prizm lack of horsepower

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?

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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

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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 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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1 Answer

Does a 1993 geo prizm 1.8L lsi have two temp sensors?

buy the manual. and RTM,
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joint venture, GM/toyota with 3 engine used.
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I need a picture diagram of a 93 geo prizm pulley system

alldata dot com
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which is yours.
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1.6L all 4L GE and FE, and GE 105 or 130HP.
in 93 the option of
a driver airbag, and a new 1.8-liter 4-cylinder engine optional on LSi trim.

when working on any engine, first ID the engine.
if posting, tell the helper the VIN or the Engine ID>
all GM cars have a RPO tag on the glove box door.
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there are the options.
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Jan 20, 2013 | 1993 Geo Prizm

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Dec 28, 2012 | 1993 Geo Prizm

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I was doing an oil change on my car 93 geo prizm lsi and i noticed i drained the oil from the wrong pan what did I drain if not the engine oil??

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Mar 24, 2010 | 1993 Geo Prizm

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1993 Geo Prizm Lsi Harmonic Balancer

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Cranks sometime

You have burnt/pitted contacts in the starter solenoid, very common on Nippondenso starters, which the Geo uses. If you can get just the contacts rebuild it, otherwise replace the solenoid and or the starter, if you have really high miles it is better to replace the whole starter with a rebuilt unit from any quality rebuilder, Delco is a real good one, The best price I found was at, $72.00 for a Delco rebuilt unit. Contacts are availiable from

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