Failed once, had it checked out and the EGR valve, EGR solenoid, and oxygen
sensor were replaced and the throttle body cleaned out. After that, it came
close but not quite. A guy at the testing station told me he heard that
when those new parts are put it, it takes a while for the computer to adjust
to them ???? I had the work done last Friday and the test on Saturday
morning. He said I should drive it this week then have it tested again next
Saturday. Sort of makes sense to me but I am wondering if anyone knows for
sure if this is correct.
The car failed back in 2002 but after replacing the convertor I got a
waiver. The mechanic that worked on it then told me it had so much oil
blow-by that it would never pass. The guy that worked on it this time said
that was not true and I tend to believe him since he got it within a few
points of passing.
Thanks for any input!
There is a reason you don't listen to people at testing stations that
are not repair techs. Most of them could not fix an emissions system if
they tried. Hence why they work in testing stations.
Take your car back to the guy that just repaired it, with the print out
of why it failed. He may have missed something like a cracked vacuum
line, or a blocked passage.
Getting emissions wavers does not correct a problem, that will only
get worse with time. In places with emissions testing, cars that will pass
have a higher resale value.
Was this another motorist making this comment or was it one of
the test station droids?
Actually, it doesn't make sense. You're going to use up your
third test, #s 4 and after will have to be paid for by you.
You'll still have to fill out the back of the VIR from the last
failed test, what are you going to put down as the performed
repairs? (drove some more doesn't count)
Again, what were the CO, HC and NOx readings?
So now it either has to meet the emissions standards or you get
it off the road. Waivers are just postponed problems.
Within a few points doesn't mean much considering how lenient the
test cut points are compared to what the car was capable of
meeting when new.
I have a 92 Caprice which is essentially the same car.
I have about 340k on the motor and transmission due to the fact that I
maintain my cars myself and am very fussy over even the most simple
Chances are you have an enormous amount of blow-by which would be pretty
normal for a car of that vintage unless it has low miles on it.
Start the engine and pull the PCV valve out of the rocker cover on the
Do you see the little pintel sucked into the valve or is it sitting at the
end of the valve?
If at the end, the passage, hose, throttle body is clogged.
Remove the hose from the throttle body and the idle should increase a lot
and if you put your finger on the port you should feel vaccuum.
If you don't, spray some carb cleaner in there and keep spraying until it
Get a new PCV valve as well.
Next item you might want to try is some GM Top Engine Cleaner.
This is basically and enema for your car and is real nasty stuff, but it
DOES work wonders.
Follow the instructions on the can TO THE LETTER and warn your neighbors
because it creates clouds of thick, smelly smoke but it does work rather
Other than that, post your readings.
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