Toyota MR2 Message Board - View Single Post - Help - failed smog test

tstoney82 · 08-04-2009, 02:31 PM

here in NC we used to do those test a lot and i used to have to fix these types of issues so here is my 2 cents........

a good fix for carbon build-up is seafoam. go to the parts store and get two cans. (i think they are about 16 or 20 oz) put a full can in the gas tank with a full tank of gas and with the other do the following:

1. disconnect one side of one of the vacuum lines going into the intake manifold. make sure you dont disconnect the side that is connected to the manifold, but the other side.
2. let the vacuum from the line suck the contents of the second bottle out. you will also have to keep the engine revving about 2000 rpm to keep it running. dont let it suck too much at one time or else it will create problems.....just let it take in a little bit.
3. there will be smoke.....thats normal. the check engine light may even come on.....again normal....
4. when its done, reconnect the vacuum line and drive the car for about 30-40 miles to "purge the system". if you notice large smoke clouds its ok....its gonna happen. its just carbon being burned. make sure you rev it high a few times while driving to allow it to clean good.
5. after that is all said and done and the CEL (if it came on) is off, go get your test done again.

might cost a total of 15-20 bucks.

08-04-2009, 02:31 PM	#3 (permalink)
tstoney82 one hitter quiter.... Join Date: May 2009 Location: clayton nc Posts: 638 Thanks: 16 Thanked 18 Times in 16 Posts iTrader Rating: (4/100% )	here in NC we used to do those test a lot and i used to have to fix these types of issues so here is my 2 cents........ a good fix for carbon build-up is seafoam. go to the parts store and get two cans. (i think they are about 16 or 20 oz) put a full can in the gas tank with a full tank of gas and with the other do the following: 1. disconnect one side of one of the vacuum lines going into the intake manifold. make sure you dont disconnect the side that is connected to the manifold, but the other side. 2. let the vacuum from the line suck the contents of the second bottle out. you will also have to keep the engine revving about 2000 rpm to keep it running. dont let it suck too much at one time or else it will create problems.....just let it take in a little bit. 3. there will be smoke.....thats normal. the check engine light may even come on.....again normal.... 4. when its done, reconnect the vacuum line and drive the car for about 30-40 miles to "purge the system". if you notice large smoke clouds its ok....its gonna happen. its just carbon being burned. make sure you rev it high a few times while driving to allow it to clean good. 5. after that is all said and done and the CEL (if it came on) is off, go get your test done again. might cost a total of 15-20 bucks.