Question about 1991 Pontiac Grand Am

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I have a 91 ga sle, manual with a 4 valve 16VOHC. I keep failing emissions. Will just a tune up fix this? Car has 91000 miles

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Maybe. depends on how badly you failed. new plugs could make the diff. so could new air filter and an oil change. oil stores a lot of hydrocarbons. if you failed by a lot more costly action may be necessary.

Posted on Aug 30, 2010

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Failed NOx emissions test


First up-- run the fault codes to determine where the tune up needs to be done to save money on unnecessary parts replacement. The CPU and ECM constantly keep en engine tuned up and will continue to do so until a sensor gets out of parameters . By previously driving at a speed to fix a fault indicates a sensor problem .. When you have the code/s come back in a comment box and may be we can give you pointers on where to attack the problem

Mar 22, 2014 | 1990 Cadillac Deville

2 Answers

1995 honda civic failed emissions (GA), what needs to be replaced?


Usually changing the spark plugs, air filter and an oil change will fix your problems. If your oil is old, you can get the high carbon. I don't usually change the spark plug wires and I just take the distributor cap off and clean the contacts.

Nov 27, 2013 | 1995 Honda Civic

1 Answer

My 1991 jeep comanche sputters when in 3rd at bout 3 grand.does it have a revlimiter?


no , but if in limp home mode (ECU) yes.

if the cel is out , running its not in limphome.

my guess? car was never tuned up, in last 60,000 miles or ever.

i had a 91 Comanche and ran it 250,000 miles, (5speed)

classic fails:

the bottom exh tube under my bell housing , the clamp breaks every 6 months ( i welded up a life time clamp) this allowed the

exhaust down tube, to flex and whole exhaust to act as silly pendulum. this put stress on my SST headers causing crackes.

this in turn let fresh air suck in to the header and slam the oxygen sensor to the rails, (car ran rich a s pig and could not keeps spark plugs clean.)

also the 91 has recalls on the CKP sensor. causing misfires.

its on the top left top of bell housing, very hard to see.

there is no scan tools for this Renix system. so can pull scan DTC codes, is your CEL glowing running?, BINGO.

my 99 Cherokee had none of this (well except sloshing fuel starves the fuel pump at 1/4 tank, design flaw.)



sputter is misfire.

the 91 does not have misfire detection in the ECU,

not till 1996.

so you are the detector.

do a full tune up.

then look at spark tips.

are the cream color or black.????????????

if black, post back.

i still miss and loved my Comanche. (im 1/8 real Comanche blood)

Nov 10, 2013 | 1991 Jeep Comanche

2 Answers

I have a 91 tercel that will not pass smog, unable to read codes, idles too high that if you put the car in gear before it warms up its jerks hard, appears to idle normally after warmed up, smokes pretty...


The smoking is probably due to worn valve guides.. the oil from the top..the head.. is leaking past the valve stem into the cylinder.. next morning or a few hours later when you start the car.. it burns this oil up..and the problem although still there is much less noticeable.. cause the amount leaking is minute..it's being burned as you drive.. otherwise it takes a while for it to accumulate.. It could mean a minor head/top end rebuild to a minor overhaul..

The emissions problem and the idle problem may be linked.

First make sure your throttle cable is clean and working properly. They can get dirty.. sticky..or even a weak spring.. but dirt rust and grime..biggest culprits.

There is an IAC (Idle air control) valve attached to the throttle body.. you may be able to spray carb cleaner into the closed throttle body to clean it.. You may need to replace this part. It can really get clogged with carbon.. and cause this high idle problem.

Next.. replace or remove/clean/reinstall the EGR valve...probably better off just replacing it.

Check all vacuum lines for cracks..replace as needed..vacuum hose is cheap.. and lastly.. do a minor tune up.. plug wires.. plugs (properly gapped of course). air filter and fuel filter..

Your car will probably pass the smog check even with the cold startup burning oil issue.. that's not what's causing it to fail..it's the EGR valve and possilbe lack of recent tune up.

You can continue to add oil between changes.. use a heavier weight.. and check often.. Once consumption gets more than a quart or so between changes..you can contemplate the real fix... or start pouring anything with the word miracle into it.(grin).

Great little car.. Best of luck!

Apr 22, 2011 | 1991 Toyota Tercel

2 Answers

My 1997 Honda Civic failed it's Emissions Test. See below the ASM Emission Test Results. What do you suggest I do to get the car to pass the smog test? ASM Emission Test Results: 15mph - RPM = 1587...


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.

Apr 05, 2011 | 1997 Honda Civic

1 Answer

Would like a list for a tune up on a 2005 chevy tahoe with 91000 miles it has the 5.3 V8. thanks


you will ned a set of platinum plugs,wires should be ok.pcv valve,air filter. coolant is also due to be changed if it has not been done and transmission is due for service

Mar 10, 2011 | 2005 Chevrolet Tahoe

1 Answer

1995 riviera supercharged with 91000 miles has a


check compression possible burnt valve check fuel pressure check ignition componants

Jul 10, 2009 | 1995 Buick Riviera

1 Answer

Can not read ecm code for emission check in GA


Normally if you can't get a reading from the ecm the ecm is dead, and goes to default mode meaning it will run ok but is at base timing and won't kick in to closed loop having the 02 sensor controlling fuel and timing, they did this because if the past if the ecm failed the car was a pull toy so you sat on the side of the road so the ecm could be bad. You could have someone do a pin out on the ecm but it would take more time than it would cost to replace the ecm.

May 30, 2009 | 1997 Hyundai Accent

2 Answers

Emissions failing with high NOx


Change the lambda/oxygen sensor in the exhaust.

May 21, 2009 | 1994 Mitsubishi Galant

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