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Old 12-02-2010, 07:36 PM   #1 (permalink)
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Question smokes like my mother-in-law

My emissions are ridiculously out of whack. I've done a thorough tune-up to my 88 Sammy including:
new: vacuum lines, O2 sensor, spark plugs, cables, distributor cap and rotor, oil, oil filter, fuel filter, some fuel lines, etc . Air filter is clean btw. replaced hoses on venting engine to to PCV valce, cleaned PCV valve, cleaned carb.

I just took it into Smog in CA and it failed beyond belief. The CO levels were fine but the HC and NO numbers were more than double. The tailpipe blows white smoke intermittently and black when you gas it. The ground beneath the tailpipe has a 3 foot long streak of black emissions from running it in place.
I'm not sure if it's related but the old spark plugs and 02 sensor were blackened like I've never seen before.

I know that it most likely needs a new catalytic converter, but that deals with the product and I think the problem is with the input so I'm going to wait until I fix the input problems before I change that one out.

Other than that, runs strong, shifts tight, and looks great.

Any helps as to why my Sammy smokes like a mother-in-law?
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Old 12-02-2010, 09:10 PM   #2 (permalink)
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how many miles are on it? Have you ever had the timing belt changed. Did you check the timing, valve lash, compression?

Black smoke is from too rich mix, might also be burning oil. The white puffs would frighten me. Those indicate water getting into the intake, possible head warp or crack?
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Old 12-03-2010, 05:03 PM   #3 (permalink)
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Default Soon to find out

I decided to take her in to a Sammy specialist, having done all the tune-ups I can myself. Here's the thing, after I tuned it up, I ran it in the drive-way for about an hour and revved it up to get it hot. All the while it was still blowing black smoke, sometimes white. But, when I hit the road this morning, it was blowing white for about 5 minutes but eventually burned off. By the time I hit my destination, after 45 minutes of driving, 30 min at 60mph, it was blowing clear and didn't have any scent. I let it sit fifteen minutes at the shop while I arranged a diagnosis, but then fired it up once more, still clean, scent and smoke are gone.

Maybe it just needed some high speed road driving to kick start the tune-up? The issue seems to be partially due to poor ignition misfiring, so maybe the timing needed a high rpm road test to kick in?

I'll post what the outcome is from the 2 hour diagnosis from the machine at the Sammy shop.
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Old 12-04-2010, 01:25 AM   #4 (permalink)
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could have been anything from water in your gas to a sticking choke mechanism. Hopefully the problem worked itself out, but that is very rarely the case.
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Old 12-05-2010, 01:10 PM   #5 (permalink)
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Default sticking choke

You're right, the diagnosis came back that the choke mechanism on the carb is bad along with 2 "microswitches" on the carb. He quoted me to replace the whole carb, but is it possible to rebuild those two components myself?
I'm even thinking of swapping the carb off my 87 just to pass Smog. How hard is that?

The tune up of everything relating to ignition and timing did perform wonders however. I highly recommend that for anyone with gross polluting issues.
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