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Old 07-19-2013, 05:54 PM
Flippy02 Flippy02 is offline
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Smog ?'s

Just tried to get my 87 waggy smogged with little luck. i'm unsure of the guys who smogged it because i don't know how they did it but managed to trip a CEL on my Howell tbi kit, and luckily they didn't notice it.

I figured out I need to adjust the timing, and i'm suspecting an exhaust leak from just before the o2 sensor, and i'm thinking i should always do plugs and wires.
anything else that can be suggested?


here's my set up I installed a Howell TBI kit for a stock amc 360 with edelbrock headers

a rebuilt 360 with a rv cam



I appreciate the help so much
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Old 07-19-2013, 06:28 PM
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Is this a Howell kit with a CARB number? They should help you, if it does not conform.
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Old 07-19-2013, 07:09 PM
Flippy02 Flippy02 is offline
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it does have a CARB# i shot them an email, but currently i'm looking at maybe i need new plugs and wires, check my timing, and hopefully not an exhaust leak just before the o2 sensor
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Old 07-19-2013, 07:42 PM
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It is running way, WAY rich. If the CEL was on, then the system may have been in limp mode. With those numbers, the exhaust should be burning your eyes.
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Old 07-19-2013, 08:19 PM
Flippy02 Flippy02 is offline
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I have the CEL for the kit installed under the dash, and he left the door open when running on the dyno, the CEL wasn't on for me, and hasn't been on, but i noticed it turned on while the tech was running it on the dyno, and was off again when i was leaving and hasn't come back on since, i just wish i had an obd1 cable to read the computer to see what he did. the exhaust smelled clean to me. lol
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Old 07-20-2013, 06:10 AM
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Hopefully someone else will chime in on this one but I'm thinking the test was done improperly.
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Old 07-20-2013, 11:20 AM
Flippy02 Flippy02 is offline
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I'm starting to think the same thing.
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Old 07-20-2013, 11:23 AM
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An OBD-I code reader is a paperclip, or some other sort of jumper wire.
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Old 07-20-2013, 01:17 PM
Flippy02 Flippy02 is offline
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Shows how much I know
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Old 07-28-2013, 02:54 PM
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From the NOx numbers, timing about 5 degrees too advanced. Do you have the O2 sensor? It may be reading too slow.
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Old 07-29-2013, 10:11 PM
mgmann mgmann is offline
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Timing and exhaust smell

I live in a state where smog is not an issue and no checks are done. However, I recently did some distributor work and have been monkeying around with the timing trying to get my 88 gw back to normal. I've got it running pretty well, but the exhaust has a sharp sort of smell that burns my eyes and doesn't seem quite right. I've got it timed to +12 degrees and live at abut 4,500 feet altitude. Any thoughts?
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Old 07-29-2013, 11:41 PM
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Anyone near you have a gas analyzer?
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Old 07-30-2013, 10:00 AM
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Not sure this will help, but when I got my rig smogged two months ago, the smog guy said he had to "heat the bleep" out of the cat to get it to pass. He said universal cats don't last more than a couple tests (3-4 years). Perhaps your cat is old.
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Old 07-30-2013, 03:43 PM
mgmann mgmann is offline
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No big deal......

Thanks guys. Just curious what that might be. Doesn't affect the way the beast runs and since Montana doesn't have any laws regarding smog I'm not going to worry about it. If they did I'd be in a world of hurt since I removed the air pump and all related goodies once the lines going to the exhaust manifold rusted shut. Another example of the government hurting little guys who are just trying to enjoy life a bit.
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Old 07-30-2013, 09:34 PM
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If you removed the AIR pump but not the cat, I know what the smell is!
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  #16  
Old 07-31-2013, 02:22 AM
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Well, you might want to spend some time on this even though you don't have to. We have a saying up here, "Lean is mean."

The high HC reading is costing you power and money. It will also ruin your cat. It is gas you are paying for but not getting anything out of.

The only time I have ever seen HC numbers that high has been when one or more cylinders wasn't firing. Look for the usual suspects, some of which will be:

Fouled plug
bad plug wire
bad dist rotor and/or cap
bad compression - burned valve or stuck ring
injector or carb problem

Try a cylinder drop test to find where to look.

If you're firing good on all holes you should be able to pass even without any emissions equipment, at least I have been able to on the vehicles I've had at the limits we have here.

Good luck
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  #17  
Old 08-01-2013, 11:01 AM
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An exhaust leak is not good for a TBI system. It will confuse the O2 sensor. The O2 sensor is what the computer uses to adjust fuel mixture. As you can see, the mixture is off according to the test, running EXTREMELY rich.

Do you have the actual CARB approved kit? It should have a heated O2 sensor. The sensor going cold is the only thing I can think of that would trigger the CEL during the test. But then it usually goes back out once the O2 sensor warms up again. That's odd.

X2 on checking for bad plugs or wires. Something is wrong.

How does the truck run and drive?
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