tursup

My daughter has a 93 Pickup that is stock. It did not pass smog last year. Here are jpegs of 2011 smog results (image 1):

http://i1132.photobucket.com/albums/...Pickup/931.jpg

Here is when it failed:

http://i1132.photobucket.com/albums/...Pickup/932.jpg

Here is after replacing plugs:

http://i1132.photobucket.com/albums/...Pickup/933.jpg

Here is after replacing cat:

http://i1132.photobucket.com/albums/...Pickup/934.jpg

Any advice what we should fix?

scope103

If it was me, I would start with fixing how you post photos. https://www.yotatech.com/forums/f120...-guide-237689/ The fragment that I was able to extract from your busted link is much too small to read, anyway.

We don't really need to see your VIN and owner's name; just the numbers. And for that it would probably be easier to just type them in.

93Xtra-Cab

After fixing your pics, I'd suggest moving out of California

tursup

Thanks scope 103. I don't post pictures very often on forums.

Co_94_PU

iTrader: (-1)

Oil change, inspect, clean and/or repair PAIR system.

I was leaning towards a bad cat, but if you compare the lowspeed results they consistently drop. The catalytic converter needs fresh air to work it looks to be starving at higher speeds, this fresh air is supplied by the PAIR system.

scope103

Bummer. The more you do the worse it gets.

Take a look at www.autoshop101.com / Technical Articles / Emission Analysis. Your high HC could be due to too Rich or too Lean, but your low CO suggests too Lean. Look for any vacuum leaks between the VAF (on the air cleaner) and the intake manifold (including all the vacuum lines on the passenger side of the plenum). I'm told that an unlit propane torch will cause idle to increase where it sucks in the propane.

High HC is frequently caused by misfire (you know that; that's why you changed the plugs). Get a timing light and check for regular plug firing on each plug wire. (You might as well look at the timing, but that's part of a smog check so that's probably right-on.) If one isn't flashing regularly at higher rpms, you might need new plug wires or a rotor.

It's possible you have an exhaust leak (adding air into the exhaust stream). Misfiring OR too rich will raise the HC, and the air admitted by the exhaust leak (or the PAIR) is running down the CO but not enough to fix the HC. But this is a little far fetched.

Good luck!

highonpottery

iTrader: (1)

search here or google -- 22re high HC smog (or variation on this)

you'll find many suggestions on where to start looking. high HC usually has to do with engine running rich. can be caused by a plethora of things, but since you mention swapping the CAT - did you also swap out your o2 sensors or tuneup the rest of the engine(valve adjust, timing, etc)? sounds like a great place to start IMO and remember to use Toyota/Denso sensor.

tursup

highonpottery, no we haven't changed out the O2 sensors. We will work our way to that. We want to check the PAIR and vacuum hoses first. Thanks.

Gamefreakgc

I posted this once before but I can't find it:

• PCV Valve - Reduces blow–by gas (HC)
• EVAP - Reduces evaporative HC
• EGR - Reduces NOx
• PAIR - Reduces HC and CO
• CAT - Reduces HC, CO and NOx

So, check your PCV valve (located on passenger side valve cover, a pain to get to but cheap to replace), your EVAP system and your PAIR reed valve.

Since your CO % also went up, I would also say it's most likely your PAIR reed valve. I've had little luck trying to find replacement parts for that one... so junkyard would be your best bet if you need to replace. Also... that hose that goes from the PAIR to the air chamber is a pain. I recommend the screw type clamps and ditch the tension clamps that are on there.

A note about the PCV valve, if it's never been replaced you'll need to change the grommet too. That requires taking off the air chamber and all those silly vacuum lines off. The grommet, due to heat exposure, turns from rubber to a hard plastic and you have to chip it out piece by piece .