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Unread 10-20-2013, 09:37 PM   #1
brinkerjeep
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desperately need help with CA smog.

Hi, I've owned my Jeep for two years now, and as expected I needed to get the smog done. I have an 87 4.2L carter carb. Everything is mostly stock, except I'm running 31's, and swapped in a three core all copper radiator, and new thermostat and water pump, hasn't had any overheating issues since. Everything else that I have done shouldn't affect the fuel/ emissions. I took it in the smog shop a little over a month ago after I sent in my registration fee. It failed the 15 and 25 mph test. My hc's were about twice the allowed amount, and my carbon monoxide was 7.2% the allowed amount is around 0.6%. The smog guy took my money and tolled me that it was probably the carburetor running too rich. So I did some research and confirmed that high CO usually means that the engine is running too rich. So I spent the weekend rebuilding the carburetor. I cleaned all the parts, and resembled the carb. And replaced the vacuum choke courtesy of my friend Dennis. I got the carb back on the engine, and fired up the Jeep and then adjusted the idle mix screws. In addition I replaced the fuel pump and fuel filter. The air filter is still new. I took it back to a different smog shop so they could do a pre test. With everything that I did and with some help from the second smog guy (some fine adjustment on the carb), we got the idle CO levels down to about 4.2%. Still eight times the allowed amount. I read some info on how the fuel system works, and came across a thread discussing the O2 sensor. I read that it sends out a voltage between O and 1 volts. A low voltage means it's a lean condition, and a higher voltage means rich. The form suggested to check the voltage on the sensor. The idea is that if you know you are running rich, your sensor should be sending a higher voltage so the computer can lean the mixture. However if you know you are rich, but you read a low voltage on the O2 sensor then the sensor is bad, however I went to test the voltage on my sensor and it read 0.96V at idle and dropped to 0.82V at cruising rpm. From my understanding, this means that the sensor is working properly because I'm still running rich. At this point I don't know what else I could check, our what I can do to pass smog. I really need to pass as I commute to school. I don't want to give it up out of state, it's a Jeep thing, and I know all my problems will go away as soon a I do the fuel injection conversion, which I am planning on doing once I have enough money saved up, and the time to actually do the conversion, Until then I need to pass the ca smog. Any advice or suggestions would be much appreciated. Thanks, chris.

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Unread 10-26-2013, 09:58 AM   #2
Gageraid
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How are your catalytic converters if there are any on that Jeep?
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Unread 11-04-2013, 03:17 PM   #3
brinkerjeep
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Hi, thanks for replying, I'm not sure about the condition of the Catalytic converter. The smog people told me that with those readings, replacing the cat Would not correct the emissions. Both smog guys told me it was the carb. I was told that simply rebuilding and cleaning the carb was a waste if time. I was told it needs a some kind of adjustment. I don't know if anyone has had experience adjusting the carb so that it runs optimally. Any help would be much appreciated.
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Unread 11-15-2013, 08:29 PM   #4
YJ4LIFE
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It's not just the carb. all your vaccum lines need to be in order. the EGR valve needs to be good. you might want to have the carb professionally rebuilt and or tuned (right jet size etc). Where in Cali are you?
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Unread 11-15-2013, 09:38 PM   #5
brinkerjeep
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Yeah, one of the smog guys that I've talked to recommended that I have out professionally rebuilt, add for vac lines and egr, what is the best way to test those out. I live in the san Fernando valley, but I commute to Westwood.
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Unread 11-15-2013, 11:20 PM   #6
YJ4LIFE
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http://www.sfvsmog.com/
They fixed my jeep 4 years ago all the vacuum lines were messed up. Ask for Fred. There's a carb rebuilder on San Fernando

Valley Carburator Co.
10365 San Fernando Rd‎ CA‎ 91331
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Unread 11-18-2013, 07:20 AM   #7
Gageraid
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Spray some carb cleaner in the carb while running and watch all the crap come out of the tail pipe. That should help a little.
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Unread 12-24-2013, 09:18 AM   #8
brinkerjeep
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Hey, so I finally got it to pass. Unfortunately I couldn't fix the carb, so I just paid someone to pass it for me. The whole thing was such a headache. Any way, I have two more years to either get fuel injection or figure out the carb. Thanks for the help.
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Unread 12-27-2013, 07:04 PM   #9
LumpyGrits
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Quote:
Originally Posted by brinkerjeep View Post
Hey, so I finally got it to pass. Unfortunately I couldn't fix the carb, so I just paid someone to pass it for me. The whole thing was such a headache. Any way, I have two more years to either get fuel injection or figure out the carb. Thanks for the help.
I would not admit to defrauding the state in an open public forum.
How did the PO get it to pass smog when you bought it?
LG
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Unread 12-27-2013, 07:20 PM   #10
brinkerjeep
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I purchased the vehicle from a dealer. So when I saw that it ran and had smog I thought it was a good deal. Unfortunately I barley knew anything about cars at the time, but I have learned a lot about engines and cars in the past two years. Kinda a crash course in Jeep ownership. But I don't think I defrauded anyone. I met a guy who pointed me in the direction of someone who knew carbs. I paid 300 to get it adjusted or tuned. To be honest I'm not sure what he did to fix it, but it passed. But I feel like it was probably a temporary fix. Either way I still wasn't to upgrade to mpi fuel injection, but until I have enough saved I will have to just get buy with that carb.
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Unread 12-27-2013, 07:26 PM   #11
LumpyGrits
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OK- maybe I read you post wrong then.
I would STRONGLY urge you to buy a copy of the REAL Factory Service Manual(FSM)!
Haynes and the like just won't do.
Been fight'n smog on mine since '85.
Good luck,
LG
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Unread 12-27-2013, 07:30 PM   #12
brinkerjeep
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Wow, that's a long time. I'll do that, Haynes is helpful, but it lacks the details. Any way, happy holidays.
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