Question about 1995 Geo Metro

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93 Geo Prizm Fails Both Low/High Speed TX Emission Test

This is a 93 Geo Prizm w/180k miles. I replaced the catalytic converter, tune up, cleaned injectors, and the car cannot pass. The car is driven less than 5k a year. I have looked for broken/bad vacumn lines, missing hoses, and still cannot find anything. The check engine light is not on. How can I pull codes to see what is wrong?

Thanks,

Duke

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  • Makoe Apr 13, 2009

    93 Geo Prizm failing with high NoX at low speed. Replaced spark plugs, air filter, O2 sensor, checked cat converter which is only 1 year old, checked timing.What else can it be. No trouble codes present.

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The answer is a deffinate YES, I just performed this on my 94 Prism see link provided. http://s3.amazonaws.com/2cp-images/question_images/3479/large.gif Here is a Picture of the diagnostic ports to connect with a jumper wire (TE1 and E1) This will cause codes to flash via the check engine light when the key is turned to the on position. Count the flashes there will be a couple second pause between numbers.

Posted on Sep 08, 2014

  • Martin Marvich Sep 08, 2014

    My bad is a metro will look but question is so old problably not needed anymore

  • Martin Marvich Sep 08, 2014

    Updated here is a link that may helphttp://www.jeffsgeometro.com/geo-metro-e...

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If the car is driven less than 5k a year than it sits for awhile, so there could be carbon buildup in the engine and intake this would cause the emissions to be bad but wouldn't through a code. you can do things like run a can of seafoam through the vacuum lines and through the gas tank. read the directions on the can and check the vacuum diagram that should be under the hood of your car to make sure you put the seafoam in the right line. to answer your question about the codes, NO you can not pull codes if the light isnt on. unless the light is burnt out and you just dont know its on. you can check that when you first put the key in the accessory position the check engine light should come on for a few seconds and then go out - so you know if the lights bad or not.

Posted on Mar 27, 2009

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I have a 93 Geo Prizm I can drive at normal speed for 15-20 minutes then I will immediately lose power and when I mash the accelerator I cant go 5 mph but after the car sits for about an hour it will drive...


lots of things, 1.6L or 1.8L engine?
never tuned up.?
bad spark.?
low fuel pressure (3 causes) {pump,reg or voltage pump low)
ECU sees all major sensor errors, sets the CEL glow driving?
insert the diagnostic jumper and drive with it planted.
then when 5mph happens does the CEL flash an error code?
im just might.
http://www.fixkick.com/PRIZM.html
click the link there Diagnostic jumpers.

car is really a Corolla. !

more?
Map sensor plugged up

the CEL means CHECK ENGINE LIGHT, what does it do?

each cause as simple tests. ask.

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What would make my 93 GEO WILL START AND IDLE BUT AS SOON AS U GIVE IT ANY GAS IT ACTS LIKEW IT WANTS TO DIE....IF U FAN THE GAS PEDAL IT STILL WANTS TOI DIE (WHICH IT DOES)


Geo what? metro,sidekick,prizm, Storm?
which engine? is in it?
Sounds(soundless) like, many things. (seen them all)
1: timing belt slipped, low compression (gauge it)
150psi good 80 bad. a 60k mile tuneup item (on the list) lost it?
2: needs a tuneup, spark parts are toast.
3: serious fueling issues.? takes tools , ask. (low fuel pressure
4: EGR valve suck open, a 50k service check.
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6: bad fuel, is fuel odd, this thing sit a long time?

all can be discovered in hr, work by any tech.
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http://www.fixkick.com/INJECTORS/PUMP/stalls.html

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Failed asm emission test


Improper Ignition Timing

Defective Ignition Components
(ignition coil/s, distributor*, distributor cap*, distributor rotor*, ignition wires, and spark plugs - NOTE:*Distributor-less engines do not have these components)

Lean Fuel Mixture

Defective Catalytic Converter
(Some symptoms of a bad catalytic converter:
Major loss of power over 15-25 mph.(does this speed sound familiar to you?)
Strong sulfer or rotten egg smell emitting from the exhaust.
Loud rattle being heard from inside the catalytic converter.

Defective Air Injection Components

Faulty smog pump if fitted.

Low Cylinder Compression.

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hi.
i know this may sound obvious, but have you changed the air filter.

this is the most common reason for high emissions on any vehicle, and is very often forgotten, especially on bikes.

also, make you get the engine and exhaust up to temperature before an emission test as the catalytic converter will not work until quite a high temoerature has been reached.
i take my vehicles for a 10 miles run before an emission test, and if i am waiting for too long before the test, i will start the engine about 5 minutes before the test is done to make sure everything is at the right temperature

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Jose, I don't know if this will give you the answer you are looking for because there are many things to consider here. The exhaust gas recirculation valve (EGR) is one of the main things involved in reducing NO emissions. This valve is controled by the power control module. (PCM) This is your vehicles computer. The PCM monitors the vehicles speed and will command the EGR to open when the vehicle attains a certain speed, which is why the ASM test being done is recorded at two different speeds. At 25 MPH your vehicle failed the hydrocarbon (HC) emissions limit and this could be for a number of reasons. When is the last time you car was tuned up? Old spark plugs, wires, clogged air filters, oxygen sensors, leaking injectors (personal experience) or the PCV valve could be contributing to the results of the test. I guess that the easiest way to go is to tune up the engine replacing the spark plugs, wires, air filter and the PCV valve and don't forget to have the oil changed at the same time. Only then should have the vehicle retested and see what the results are. Should it fail again you may have to consider having the EGR or the catalytic converter replaced depending on what portion of the test fails. If the NO fails I would consider the EGR. If the HC fails then I would consider the catalytic converter. Good luck with this.

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