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Old 06-23-2003, 11:10 AM   #1 (permalink)
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Smog tricks / tips

Well.......

Just post up any little tricks or whatever you know of to hlep get through smog. This is assuming everything is working, but for say a motor that's tired and burns oil or whatever.
~John
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Old 06-23-2003, 11:22 AM   #2 (permalink)
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You can do a "pre-test" at the smog place, with the comuter off-line with the DMV. This will let you know if you are going to have problems in the first place.
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Old 06-23-2003, 11:24 AM   #3 (permalink)
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rubbing alcohol in the gas tank
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Old 06-23-2003, 11:33 AM   #4 (permalink)
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depends on what the problem is.

If it is hydrocarbons, brand new clean oil and a very hot engine will help.

definitely pay for a pretest to avoid being black flagged as a gross pollutor
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Old 06-23-2003, 11:33 AM   #5 (permalink)
 
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Get your engine good and hot before testing.
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Old 06-23-2003, 12:31 PM   #6 (permalink)
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Just for clarification, an engine can burn a crap load of oil, and still pass smog, just make sure the oil is clean. In other words, buring oil does not make HC, and CO numbers higher. BUT, oil can easily be contaminated with fuel, and cause those numbers to rise.
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Old 06-23-2003, 01:19 PM   #7 (permalink)
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Yup, Change oil, Change PCV, Pretest
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Old 06-23-2003, 01:29 PM   #8 (permalink)
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Spark plugs can make a difference too. I went from fail to barely passed on my DD 84 Sentra 4banger. Next year gets a new PCV and that junk in the tank that says it'll make ya pass no mattah what!
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Old 06-23-2003, 03:19 PM   #9 (permalink)
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My tricks:

1) new plugs, one stage HOTTER put in day before test
2) run a full tank of 76 super, with a bottle of 104+ AND a bottle of "smog check" (get this at pep boys) [WARNING: this lifts your octane to almost 106, be aware you WILL knock and ping if you are out of tune. Last time I did this I was running a 6AL and still had pings]
3) after filling up, drive right to the shop, stay a gear lower than normal, you want to heat the motor up nice and hot.
4)as everyone said, PRETEST.

5) if your prestest comes out bad, you can cheat a little bit. Install a brand new catlitic converter, then bore 2 holes 1/32 in size, about 1 inch and 2 inches back from the muffler. This introduses air into the exaust. Drill them on top of the pipe, and drill NO more than 2. The test computer will pick up the mod if you run them to big..and fail you. Its a bit tricky to get the right mix of air to trick the system, but it can be done.
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Old 06-23-2003, 04:53 PM   #10 (permalink)
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Methonal

Run your tank down to about 1/4 gallon and then put about 1/2 gallon of methonal in. After it passes go fill up your tank. Works for me everytime.
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Old 06-23-2003, 04:56 PM   #11 (permalink)
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My smog trick was to buy one presmog jeep.
I plan on green stickering my other.
Then I bought a diesel truck
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Old 06-23-2003, 05:18 PM   #12 (permalink)
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Quote:
run a full tank of 76 super, with a bottle of 104+ AND a bottle of "smog check" (get this at pep boys) [WARNING: this lifts your octane to almost 106, be aware you WILL knock and ping if you are out of tune. Last time I did this I was running a 6AL and still had pings]
You are on crack. higher octane fuel does not burn completely. Try 87 octane buddy. And it's not heat the motor up nice and hot, make sure that cat's hot. Also if your pile burns excessive amounts of oil replace it, the burnt oil clogs up the catalyst. And do change the oil and make sure egr and air injection (if applicatable) are in good working condition.
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Old 06-23-2003, 06:48 PM   #13 (permalink)
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Methanol works every time for me too. I run it about 7to1 though. Seven gallaons re3gular fuel to one gallon methonal
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Old 06-23-2003, 06:51 PM   #14 (permalink)
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Quote:
Originally posted by ROK RNR
Methanol works every time for me too. I run it about 7to1 though. Seven gallaons re3gular fuel to one gallon methonal


where do you get methonal?
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Old 06-23-2003, 10:06 PM   #15 (permalink)
 
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I used to work for a brit car shop and we had to have the late 70's POS's pass the sniffer test here in Texas. Here is what we would do:
Oil change
Clean out the jets in the carb
Lean out the mixture
Retard timing
Add RXP (small red bottle, available at PepBoy's, O'reilly's etc. This stuff was actually suggested by the guys running the machines)
The car was slow as hell getting to the test center, but the number were low enough to pass.
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Old 06-23-2003, 10:06 PM   #16 (permalink)
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Quote:
Originally posted by AZRocks
Get your engine good and hot before testing.
If it is carbed, a computer controlled one will lean itself if cold - less emmissions. Therfore yank the tstat if it is computer controlled before the test..
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Old 06-23-2003, 10:53 PM   #17 (permalink)
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I always thought it was best to run the lowest octane possible to help pass. Anyways, make sure the engine is warmed up and, if you can, check that the sensors are working.
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Old 06-23-2003, 11:02 PM   #18 (permalink)
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Originally posted by Brandon


If it is carbed, a computer controlled one will lean itself if cold - less emmissions. Therfore yank the tstat if it is computer controlled before the test..
Hate to break it to ya, but a cold computer controlled vehicle runs richer to help warm it up Thats why there is open and closed loop operation.

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Old 06-23-2003, 11:04 PM   #19 (permalink)
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Originally posted by blacklabjeep
Retard timing
.
If you retard the timing, it will slow the burn, and get lower HC readings, however, when the tech checks your timing, and realizes that the timing is not in spec, you will be failed

It might work in Texas, but not in California
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Old 06-23-2003, 11:17 PM   #20 (permalink)
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My 84 had new plugs, new cat, and new oil. Still failed. Burning to much oil. So I removed the hose that goes from the valve cover to the air cleaner, stuck a bolt in the hole and slide the hose over it. Then under the air cleaner where the PVC goes to the Carb base plate i did the same thing. I think the motor had to much blow by, and when I did this it passed smog. Just barely, but good enough for me to sell.
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Old 06-23-2003, 11:22 PM   #21 (permalink)
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Sounds to my like you needed to buy a new PCV valve
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Old 06-23-2003, 11:56 PM   #22 (permalink)
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you can only retard or advance the timing 3 degrees to be in the safe area. so not enough on a stock motor to mean anything get the timing a little too far off FAIL
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Old 06-24-2003, 06:20 AM   #23 (permalink)
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Originally posted by noodles
you can only retard or advance the timing 3 degrees to be in the safe area. so not enough on a stock motor to mean anything get the timing a little too far off FAIL
2 degrees
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Old 06-24-2003, 10:05 AM   #24 (permalink)
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Another good one,
MSD timing control, this is the dash mounted knob that you can adjust your timing, you must hide this some where, don't leave out in the open,
Anyway, this guy i knew, installed it, Retarded the HELL out of the timing, this get the Mainifolds a good cherry red, then leave it running, as soon as they are ready to test, turn the knob back to set you timing back to spec's
The hot mainfold/pipe act like a pre cat and burn up a lot of the junk before it gets to the cat so the cat does not have to work overly hard to clean up the emmissions
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Old 06-24-2003, 10:10 AM   #25 (permalink)
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WHERE DO I BUY METHONOL?
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