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How to tune up a 1995 Geo Prizm? not passing smog, They told me to tune up and get new cataylic converter, but wont guarantee it will pass smog test.

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  • Geo Master
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Posted 4 times this is #3, again, no smog sheet posted, why:?
what they told you is a wild guess,
what will be, will be, is the truth.
if you ask folks to guess, they may try, why ask>?
as they say be careful what you ask for, you might get it (lies,guessing or worse)

Get it fixed, then you tell us what was wrong,
I can name 50 things possible, what be the point of listing here, (i have the list on hand)

if lucky ,it only needs spark plugs.
lacking a scanned copy of your smog fail report
any answers here are useless.
to a fault.
we can quote statistics, but your engine dont read those, it does as it please (fate)
all spark part's filters and and a new cam belt
covers the tuneup. (same as all rubber band engines) the 60k list is good... to follow.
a new cap /rotor and wire set would be a good start.

next is to read the smog chit.
see those numbers, those numbers have meaning.

which one fails and by how much, ?????

they will tell you to do fresh engine oil
on the idea that it's full of gasoline.
check PCV valve to make sure its not clogged
no vacuum hose leaks
check engine timing.
check that ECU goes to closed loop status , it idle
and at light medium cruise speeds.
takes a specials scan tool you dont have.
make sure injectors are not leaking or partially clogged, (tests)
new 02 sensor, id do that with the new sparks.
there is only one on this car. easy to find.
no exhaust leaks hear said 02 sensor. or it fibs.
after a tune up the mech checks for misfiring
if the engine misfires the CAT may not be able to eat up all that smog... (fully catalyze it)

Your car gets a real sniff test.
so there is no fooling the sniffer. ever.

now ill answer in way 2.
lets say NOX test (sniff) only failed.
the mech finds the EGR valve dead, fixes that.
a $50 part and it passes smog.
or it was only a cracked hose to the EGR, a 50 cent fix. omg, really. only 50cents, YES.
see NOX needs a good EGR and a good cat to be clean.

like I said, what will be ,will be...
Life is like a box of chocolates. you never....

Posted on Dec 29, 2016

  • Anonymous Jan 01, 2017

    the only guarantee in life are 2.


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  • Geo Master
  • 76,846 Answers

A tune is just replacing the spark plugs every 100,000 miles and the air filter every 30,000, clean oil is also a help in passing smog, the new converter is what will most likely do the trick.

Posted on Dec 28, 2016


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HOW To: tune up Geo Prizm 1995, myself.

wow ,no posted smog report, (the failed gases) now that makes this 10s harder, and for sure more expensive.....
many post,. why not just add to one post
click comments and add.
or edit one. post.
all engines that fail smog run fine. (so says all owners)
(fine means zero,) in the real world.
what's worse is owning a 1995 in USA, and must get sniff tested.
(cant fool that method) no report by you, (paper)

ignore all statements by all smog testers,
only one statement (it fails!)
all others are lies, guessing and BS.
after all if they were fully trained and skilled they'd have a real job.
a fact. (or they get huge retirements from the state?)
The car needs to be check by a pro.
it needs to be scanned, with a custom scan tool that is not sold in any auto store until 1996 happened.

but if that NOT IN THE CARDS./ no money for a real ASE tech?
then yes, do a tuneup..

1: spark plugs. and new wires, cap and rotor.
2: filters. and fresh engine oil, (the oil can be full of gasoline is why)
3: the cat may be ok, is spending a fortune on that good?
on a wild guess,? like your smog guy quipped?
that be your call. no? (shot gun method or testing) your call.

in a shop they would get the engine running perfectly.
in closed loop hot and light cruise.
A NEW front 02 sensor for sure.
then they test the cat last, the CAT is always last.
i think this car has 3 way cat too, so is really 3 cats in one.
all 3 must work. or you fail... (for sure)

what if only NOX gas failed.????
if yes, we fix EGR first. then CAT last. (they work as a team)
what gases failed matters
and was not stated by you.
in a real shop they can sniff front of cat and rear
and tell you ,
bad engine, or bad cat. in minutes.
or both, sure.

bad engine means
1:engine is bad.
2: EFI controls failing, (fuel or spark)
3: misfires. (even some humans cant hear, omg)
4: and many more. but no smog sheet posted, no savvy.

a pro shop knows the pre cat gas levels that are normal.
if they are, then the cat is bad.
end story.

Dec 28, 2016 | 1995 Geo Prizm

2 Answers

My 1992 Geo Storm wont pass smog because of emission problem what can I do and how much will it cost

hard to say as to why it did not pass, but it sounds like you have a problem, most emissions are caused by too much hydrocarbins coming out the tail pipe, new cat converter,

Mar 24, 2015 | 1992 Geo Storm

1 Answer

Pass smog test

change your oil and oil filter. Add a bottle of octane boost to the fuel tank then top off with fuel. Drive vehicle for about twenty minutes then have emissions tested. Unless you have a bad catalytic converter, you should pass emissions.

Apr 15, 2014 | 2001 Mitsubishi Eclipse Spyder

1 Answer

My 1999 kia sephia wont pass smog test

You will need to get it scanned and get the codes for the problem. If it failed the test due to emissions I would almost guarantee it will be your oxygen sensor or cat

Jul 31, 2012 | 1999 Kia Sephia

1 Answer

It wont pass smog and the mechanic told me it was the egr valve i changed it and it still wont pass

it can be complicated to pass the smog test! check your gas cap. thats the most common reason for a fail! they will not tell you that. you can have it code read at any autozone or advance auto for free if your check engine lights on.[only] otherwise you're at the mercy of the only garage you trust. it may be a bad 02 sensor,you have 2 [cost around $75.00]each. it may be stopped up catalytac convertor,do you smell rotten eggs when driving or at idle? thats a sign of bad convertor. good luck and thank you for choosing

Jan 22, 2011 | 1995 Chevrolet Monte Carlo

1 Answer

My 1995 geo prizm lsi engine light came on it runs fine however it failed emmisions testing because nO was twice the limit what could it be

You need to find out what is causing the check engine light, to go any further in fixing you car. Most likely you have a bad sensor, but you should go to a local auto parts store, as most of them, like auto zone, will scan your car for free and tell you what part is most likely bad. a little luck and you will get a cheap fix and pass emissions!

Jan 19, 2010 | 1995 Geo Prizm

1 Answer

85 Pontiac Fiero - passing a smog testing

Could be vacuum or O2 sensor maybe using cheap fuel.

Aug 03, 2009 | 1985 Pontiac Fiero

1 Answer

1994 Geo Prizm

try checking plugs and wires, the drisributor cap could be washed and if yours is like my geo the coil is in the distributor. but just check those and go from there

Jun 08, 2009 | 1994 Geo Prizm

2 Answers

Cannot pass inspection. emissions.

go to a place like autozone or pepboy autoparts
tey will the code retriver myth have a factory code
that service is free,if they are code they will explane
wath next

Apr 19, 2009 | Geo Prizm Cars & Trucks

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