How To Prepare Cars For Emissions Smog Test Things To Check Get Ready Pass

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This Page Contains information about How To Prepare Cars For Emissions Smog Test Things To Check Get Ready Pass By edwino85 in category Blogs with 12 Replies. Last Upated: Thu May 15, 2014
this year i also had to get my car ready to the bi yearly required emission smog test set by the state and the department of motor vehicles (DMV)

every year its panic mode because you never know if you car is going to pass. so to make sure, or atleast increase the chances of your car passing i am writing this little guide to maybe help you get your automobile ready to pass the required emisions test. here is a list of things to check

EASY ONES- least expensive:
1. change your oil

2. change your oil fileter

3. change your air filter

4. change your fuel filter, if you havent changed it for more than 5 years

5. Change PCV (positive crankcase valve), these have a little valve that you can test, if you shake the valve and you hear "clicks" then you know its good, but these little suckers are know to get stuck, so if you shake it and you don't hear any clicks, they you defenetly need to change it, but i recommend anyway to replace before you go to the testing station

MODERATE - More expensive

6. Check/Change spark plugs. I usually just change them.

7. Check/Replace spark plug wires

8. Replace distributor rotor, if you have distributerless car, then you don't have to worry about this step.

9. Visually Check for worn or torn vacuum lines

DIFFICULT - more expensive:

10. Oil leaks around the engine, an oil leak means that you are losing oil pressure. The PVC valve is also responsible to recycling these fumes, and if you have a leak, then your emssions system may not be working right. This can be simple or a difficult thing to do depending on you make and model car, but generally, engines leak around the valve covers, and all you need to do is replace the broken gaskets with a new gasket. These gasket are usually made of rubber, and when rubber mixes with heat, the more time rubber is exposed to heat, the rubber gets brittle and it breaks.
the gaskets would cost you around $10 dollars each.

11. Check for Exhaust leaks, How do you know when you have an exhaust leak. Well, you will know by the sound, since there is a leak, the exahaust is not being muffled (silenced) by your muffler and your car will come noisy as you exelerate the engine.

12. Check Engine Light (Lamp) is On - if you have the check engine light on and you have an emissions related code, your chances of passing the test are very, very low, if not impossible. so you defenetly need to check as to why you have. You can take it to a shop to tell you what's wrong with it. or you can take it to your local auto parts store, they usually provide this service for free. or you can buy a code scanner and connect it to your car's computer. There are alot of sensor in you car's engine that make your engine run effiently and cleaner, but if one of these sensor malfunction, then the computer is not getting accurate reading and it will make your car not run very well as it should.

13. check vacuum leaks

14. throttle body cleaning

15. Fuel injection cleaning

16. Check for EGR valve is working correctly

17. Check the exhaust, if your tail pipes are dispersing white smoke, you may have a water coolant leak, this will be very expensive to fix. If the smoke is black, you may have in oil leak inside the engine due to a bad head gasket, this will also be expensive to fix, starting at around $300 dollard and up. If the exhaust smell like gasoline after the engine has reached normal temperature (its normal if it smells like gasonline when its cold because the catalytic coverter is not hot enought to burn the exhaust fumes) but if your car has reach its normal operating temparture and it still smells like gas, they you have have a problem with your emissions or even your catality converter, but usually catalitic converters do go bad, they last pretty long, like ten years i would say, or it could also mean that your car is running too lean (more gas, less oxigen), then you will need a tuneup to fix this, which brings me to the next check;

18. Tune-Up, a when a mechanic does a tuneup, he/she should check all the things i've have listed here. they have special equipment to heck all these things, so remember, they've invested money on tools to check for symtoms in your car, so i guess that's why its costs alot. for an average 4 cylinder car, it would cost like $150, the bigger your engine gets, the more expensive it gets, like v6 or v8s.

19. The last you can do to make you chances better, is to drive your car for atleast 30 minutes before taking it to the station, this is what i do:
go 15 minutes on the freeway/highway, then 15 minutes on the street, then go to the station, and while i am waiting at the station, let the car idle until its time for the station do the test, buy this time you car's engine and catalytic converter should be running at optimal for burning harmful gass to the environment.

20. if you don't pass, the tech might suggest to check your engine. on some states its illegal for them to tell you what's wrong, they'll just tell you whether you pass or not, and you have to take it to special shops for repairs. but some might suggest what could possibly has gotten wrong on you car, things like your egr valve, catalitic converter, etc..

I hope though you have pass, but if you have not, remember my tips, I've only NOT passed once, and it was because I had a bad o2 (oxigen) sensor, once i replaced it and went back to the station shop, i passed with flying colors!!

Good luck
Pathfinder
Last month my tags expired and i read your post here and followd your advise, I am glad to say that i passed my smog test inspection with flying colors. thanks for the great information. I have 1998 N
Lolly
thank you!
i have a 96 toyota corolla. this information will be very valuable before going to get the smog check.

thanks a million!

Frank
does this program comply with california's smog laws. ?
jack
do you have to smog test your car before you sell it? california
Bill
you can sell the car, but the person registering it needs to pass a test...unless that person is a close family member.
Lloyd
ok. there are a number of things yxx% incorrect about your post
being a licenced california smog tech, i will tell you that some of them ar enot only wrong, but misleading as well
starting with number 4
i know of several vehicles that, if you shake the pcv, it will rattle. does not mean its broken, just means it rattles
#yx. yes, if you are leaking oil it may effect emissions. more than likely it would fail visual, but either way, it does need to be fixed. also, if its valve cover gaskets, felpro gaskets start at about 3x-4x$, and may take hours of work.
#yy. more than likely you will hear a noise, but if its cracked just a little, your nox will not be reduced, but the other emissions may stay below the allowable limit
#yz. if your check engine light is on, it will fail, and the smog tech has the right to send you away before the test the mil is on. also, if you are getting codes, do not just clear it, find what the peramiters are for the code and check around as best as possible
oyo
if you leave your battery not connected, you have to drive 60 miles at least before smog testing, for the obd codes to set, or you'll get a failure test result. $$$
Frank
Great information --- '88 S10, 2.5L, 195,000 mi. --- I did everything you
recommended and it passed the lst
time. Thanks
jorge
hi,i got troble with 4 code; 2 oxigen sensor ho2s lf and rf of my 1997 mazda truck, i fixed , and take to autozone , if still got them, i do not know if i have to disconet the batery to recect the cumputer,please help me
BMW
Did run the car for 20min before going to emission. A friend told me to put in Premium fuel, and passed with great number!
e39v8
I used SEAFOAM through the intake on my 97 BMW e39 and I PASSED the smog test after that. Check out the video for complete results youtu.be
Jorge
my car just fail the pvc test because of a broken oil dipstick, not missing just broken.
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