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Failed Emissions Testing


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#1 OFFLINE   Ozzker

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Posted 07 March 2011 - 07:08 PM

So, I took my 1988 Pathy in today for an E-Test as Im trying to get it on the road, and it failed pretty horribly. The readings were:

Posted Image

Does anybody have any insight as to where I should start in diagnosing and fixing this?! Engine doesn't burn oil, has 340000KMs and has just had new plugs, wires, and distributer put in.

Thanks in advance!! :beer:

#2 OFFLINE   adamzan

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Posted 07 March 2011 - 07:38 PM

Your cat is probably bad dude. That's what my numbers looked like when it was bad. A shop that does emissions work can do this test on the cat where they drill holes on either side in the exhaust and measure it.

#3 OFFLINE   Ozzker

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Posted 07 March 2011 - 07:40 PM

I assumed Cat as well. Taking it to my shop Friday for a Cat, driving it all weekend, and getting it re-tested Monday, see where I'm at!!

#4 OFFLINE   nunya

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Posted 07 March 2011 - 07:57 PM

Looks like a sad converter to me too... specially that co reading difference between idle and tached up

#5 OFFLINE   Ozzker

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Posted 07 March 2011 - 08:25 PM

Thanks!!

Converter is getting done Monday, And I will also run a bottle of seafoam through the truck prior to that, to empty out all the nastys from the engine!!

Edited by Ozzker, 07 March 2011 - 08:26 PM.


#6 OFFLINE   silverton

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Posted 07 March 2011 - 09:04 PM

a high HC count is unburnt fuel.

do a tune up, replace the o2 sensor along with it, and get a new cat.

I see they are a bit more strict there, than here in Washington state!

#7 OFFLINE   Ozzker

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Posted 08 March 2011 - 07:15 PM

They are strict up here, and for a 23yr old vehicle, it sucks.

Update: Seafoamed. After 8 minutes of Revs between idle and 4K it was STILL pouring thick white smoke, so I took it for a drive to get her to stop smoking! :P

New Cat going in Friday.

#8 OFFLINE   silverton

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Posted 09 March 2011 - 04:31 AM

with seafoam you're just supposed to maintain an above idle rpm, I usually stick it around 2000 or 2500. But a drive does the trick too.

#9 OFFLINE   87pathy

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Posted 09 March 2011 - 05:36 AM

you sea foamed your engine.

well, you either fixed it, or finished it.

#10 OFFLINE   Ozzker

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Posted 09 March 2011 - 06:05 AM

you sea foamed your engine.

well, you either fixed it, or finished it.


It runs allot nicer now, the place I notice improvement most is my acceleration. I find it easier to accelerate, like the truck has more pep to it, and its nice and smooth!! :itsallgood:

#11 OFFLINE   87pathy

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Posted 09 March 2011 - 06:08 AM

It runs allot nicer now, the place I notice improvement most is my acceleration. I find it easier to accelerate, like the truck has more pep to it, and its nice and smooth!! :itsallgood:



thats good to hear.

from what i have heard and seen, using sea foam is a 50/50.. fix it or ruin it.

#12 OFFLINE   thehuntersam

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Posted 12 March 2011 - 07:29 PM

thats good to hear.

from what i have heard and seen, using sea foam is a 50/50.. fix it or ruin it.


Is that only on the old vg30I's? or are you saying any motor in general...
I've used it once on my old vg30, Didn't blow that much white smoke but it still ran great.

#13 OFFLINE   nunya

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Posted 12 March 2011 - 08:57 PM

I seafoamed mine once, all it did was make him smoke worse for a couple weeks.

#14 OFFLINE   87pathy

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Posted 14 March 2011 - 11:10 AM

all engines.

there is no difference between the vg30i and the vg30e, except induction, flow rating in the heads and timing belt.

they are the same engine.

#15 OFFLINE   Mauitrailguy

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Posted 16 March 2011 - 07:37 PM

I have also heard some pretty nasty things about sea foam.
I had issues passing smog on my 88' before i registered it in HI and don't have to do it anymore.
What i did to pass is this:
-get a bottle of guarantee to pass stuff
-fill up to 3/4 with 92 octane and mix in Emmisions pass stuff, drive till on E
-put 1/4 tank 92 Octane
-Drive on HWY so Cat is super hot as it does nothing unless at operating temperature
-Go take test

this worked for me in Seattle
Good luck

Edited by Mauitrailguy, 16 March 2011 - 07:37 PM.


#16 OFFLINE   porsche4786

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Posted 17 March 2011 - 07:26 AM

I've heard a couple different things people have done to pass. First one was to put some moth balls in the gas tank and go thru DEQ. The other was to take a wet towel, and stuff it around the outside (if I remember correctly) of your air filter, and go thru (do this right before you go thru). But I haven't had any experience with these methods. Luckily, the only car I've had to take thru is my rx-7, and it's passed without problems, except for being too loud once. It's actually registered to my parents (don't want to pay the $200+ to switch it over to my name), and now their residence is away from DEQ, so I just mail in a check and they mail me my tags.

#17 OFFLINE   Alkorahil

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Posted 24 March 2011 - 01:17 PM

with the HC and NO so far out of spec you have a dead cat. When the vehicle is good and warmed up I would bet there is no water coming out of the tailpipe either, another sign of a dead cat.

When doing your emissions test have only 87 octane gas in the fuel tank, no injector cleaner or other stuff.
Run the vehicle at sustained highways speed to get it up to normal operating temp before taking in ot be checked.

Make sure your ignition timing is correct. If it is off you will have too much NO or HC depending on how far off you are. If you have an automatic make sure to check in withthe vehicle in neutral not park.

Make sure also you O2 sensor and engine temperature sensor are in good working order.

#18 OFFLINE   Mauitrailguy

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Posted 24 March 2011 - 01:54 PM

87 octance is dirty, can cause knock in you engine and leaves behind alot more carbon. I always use 89 for daily use. I use 92 when I go wheeling.

#19 OFFLINE   Ozzker

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Posted 09 April 2011 - 10:28 AM

Drive clean is a stupid bitch.

New Scores:

Posted Image

I have a brand new cat, brand new O2, used exhaust with no leaks, new air filter, and a seafoam job done since the last test, and I did much better this time, but idle CO% is still wayy too high.

Any ideas, anyone?! What it may be, what may fix it, any tips or ticks to get it to pass, fake e-test, ANYTHING?! Im sooo frustrated with this truck and its E-TEST!! Why couldn't it be an 87?!?! Anyone have a full set of vin plates for an 87?!

Thanks in advance for any help guys, everything is appreciated!!

#20 OFFLINE   sewebster

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Posted 09 April 2011 - 10:41 AM

Well, your emissions results aren't great in general. You almost failed HC on the driving part too.

CO I think, is caused by too much fuel. Some ideas: PCV valve stuck? maybe really badly worn piston rings? injection leak? saturated evap canister? And of course, anything causing your fuel/air mixture to be rich. Often this could be the O2 sensor but you fixed that. Do you have an ECU diagnostic mode that checks the mixture? My 91 does...




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