94 Fzj-80 Failed Emissions

[Snowrun]

I just had my LX tested, half tank of fresh gas and 1 bottle heat, passed well with 170K on stock cats.

I'm Jealous. The second CAT should be in next week. I am anxious to get this whole mess behind me.

 

[Snowrun]

It finally passed!!!
So here are the numbers after swapping out both Cats.
I am still not happy with the CO number. It seems like that is still a bit high. (I plan on testing the PAIR reed Valve this week)
Any ideas how to drop that number? (I don't want to have to go through this again in 2 years)

 

[BobinDenver]

Glad to hear that things eventually worked out!

I'm having NOx trouble myself. After the first fail, Toy Car Care suggested new CATs. Quoted me $3,300 for P,L+T. I'm going with Plan B (then C, D, and E) before moving on to full CAT replacement. This thread and some others have been very helpful for those plans.

Thanks in advance!

 

[Snowrun]

Glad to hear that things eventually worked out!

I'm having NOx trouble myself. After the first fail, Toy Car Care suggested new CATs. Quoted me $3,300 for P,L+T. I'm going with Plan B (then C, D, and E) before moving on to full CAT replacement. This thread and some others have been very helpful for those plans.

Thanks in advance!

I may ask Treeroot if he wants to get together and make some youtube videos on how to troubleshoot each of the components involved.
I would check the EGR, EGR vacuum module and VSV before putting on cats.
All three are pretty straight forward to test and a lot cheaper than cats.

Do you have a green top or blue top EGC vacuum modulator? (The green tops have a filter that can get plugged)

3300 for cats seems very high. There isn't much to swapping them out. I ordered 2 from CruiserDan and it only took a couple of hours to swap them out.
(I had to cut off all of the bolts with a sawsall)

 

[Bikeman]

Glad to hear that things eventually worked out!

I'm having NOx trouble myself. After the first fail, Toy Car Care suggested new CATs. Quoted me $3,300 for P,L+T. I'm going with Plan B (then C, D, and E) before moving on to full CAT replacement. This thread and some others have been very helpful for those plans.

Thanks in advance!

I was quoted less than $700 for 2 cats installed from A&A Performance Muffler. Toy Car Care has always been waaay high on quotes I've received over the years.

 

[treerootCO]

The Ptarmigan passed

Sporting FJC E-tires.

Ambient temperature 55°F
Intake temperature 67°F
Engine temperature 177°F
91 octane
55 highway miles prior to the test with cruise set to 2100 rpm

Numbers from 2 years ago:

35s on an FJC

 

[sleeoffroad]

I think you should leave it like that.

 

[treerootCO]

How many lug nuts does a Prius have?

 

[treerootCO]

You're up John. When do you want to run yours through?

 

[Snowrun]

I am hoping this week. I am keeping my fingers crossed.

 

[Snowrun]

Passed on my first try this year
Myself and Treeroot cleaned the MAF,changed the oil,changed the air filter and ran a couple bottles of Red Heet with 91 octane.
Also I think it helped that it was around 40 degrees out.
(Sorry for the sideways photo) Darn iPhones.
The truck has never ran better.

 

[simps80]

Nice!!

 

[Snowrun]

Here we go again....

So it looks like a new failure has popped up this year.
CO GPM and HC are very high numbers.
Did all the normal things. Cleaned the MAF, ran a bottle of Red HEET.
New air filter and gas cap....
Cleaned up the distributor. Also checked the timing and it is still spot on.
Looks like this failure is a pretty solid failure.
Also they managed to get the truck to throw a CEL 25 during the test.
Any advise?

 

[Nemo]

Newer cats or O2 Sensors. If not one of those probably would do the trick. The numbers to me make me think you could slide with O2 sensors but hard to say if you might need both? Didn't see how many miles on the 94? Edit just saw the miles. 243 and some change. Nicely done.

 

[treerootCO]

The two O2 sensors and the two new cats have 57000 miles on them and have been installed for four years. I'm wondering if his truck has always ran lean for some reason and the cats worked to mask the high CO numbers. Too expensive to swap cats every two years.

 

[Snowrun]

Simps80 and I changed the MAF last night. (just because we had a spare). It seems to run a lot cooler. I am planning on getting under the truck today and looking at the harness wires going to the O2 sensors. I am seeing a few post on mud about wires having issue. If that checks out I am going to see about getting a couple new o2 sensors.

 

[bruce285]

My failure is on high nox, with new cats and EGR valve. See below link.

http://www.risingsun4x4club.org/forum2/showthread.php?p=275755#post275755

 

[treerootCO]

New MAF sensor

 

[bruce285]

Pulled the intake plenum off the 80 today. EGR port was solidly plugged with carbon.

 

[Snowrun]

Pulled the intake plenum off the 80 today. EGR port was solidly plugged with carbon.

Do you have emissions measurements before and after?
It would be interesting to see what effect it has on the numbers.