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Old May 12th 07, 02:32 AM posted to rec.autos.tech
Steve W.
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Posts: 237
Default Failed Smog - Any Clue in the Numbers?

Blake wrote:
> Thanks for the tips. This was very helpful.
>
> After reading them, I did some checking. The bottom line (so far) is that
> the engine idles normally with the EGR valve removed and a big gaping hole
> in the intake. I suppose it must be plugged with carbon.
>
> I can see a couple of knock-out plugs on the EGR passages on the intake
> plenum. I guess I'll knock them out and see how much carbon I can clean out.
> Beyond that, is there anything else? Any magic solvent that cleans out the
> carbon from those hard-to-reach places?
>
>
>



Well there is a way to remove some of the carbon BUT if the passage is
blocked it probably won't remove it all.

Hit a GM dealer OR a GOOD parts store and grab a bottle of GM Top Engine
Cleaner (liquid not the spray can version), the proper amount of the
correct oil for your vehicle and a good filter.

If you live in a crowded area go visit an open area or do this at night.
It WILL generate a LOT of smoke and whatever the exhaust is pointed at
is going to get REALLY crappy. DON'T do this procedure INDOORS.

Then run the engine till it hits operating temperature and shut it off.

Disconnect the air intake hose from the intake manifold IF it is after
the MAF sensor, if not find a vacuum line and disconnect it. (power
brake booster line works pretty good on most vehicles)
On your engine you can also pour a small amount into the EGR passage.

Start engine. It may run crappy but don't worry about it.

Slowly pour half the bottle of cleaner into the intake connection. Keep
the engine running while you do this. If you need to use a vacuum line
just stick it into the bottle halfway and let the engine suck it up.

Now dump the remaining half bottle into the intake connector. If your
using the power brake line just use a funnel and dump it in quick.

This should shut the engine down,(if you used a small vacuum line shut
it off). Allow the engine to sit and the cleaner to soak for 15 minutes
or so.

Reconnect the air intake or the vacuum line. If this is a newer vehicle
you will likely set a code or two doing this.

Start it back up and watch the cloud of smoke form... Then jump in and
take it for a spirited drive to blow out as much crud as it can. Just be
prepared for people to yell that your vehicle is on fire! Did I mention
that this stuff makes a LOT of smoke?!

As soon as you get back change your now VERY dirty oil and filter.



--
Steve W.
Near Cooperstown, New York
NRA Member
Pacifism - The theory that if they'd fed
Jeffrey Dahmer enough human flesh,
he'd have become a vegan.
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