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Re: Failed emissions test...again [Re: huskyohilux] #930079 02/24/09 12:17 AM
Joined: Apr 2006
Posts: 658
wsquaredodie Offline
Rock Warrior
*****
$20 on a used cat in Sweden???? Send all you can to me. Our scrap yards pay lots more......


trafdlo
From the Off-Road World
Re: Failed emissions test...again [Re: wsquaredodie] #930080 02/24/09 01:24 AM
Joined: Jan 2004
Posts: 383
Stevie Offline
Mudrunner
Amen Brother!
Around here, guys & gals go out to their cars/trucks in the morning to find that some low-life CUT THE CAT OUT AND SOLD IT to crooked scrap dealers. <img src="/forums/images/graemlins/ignore.gif" alt="" />


'80 4X4 Longbed
Re: Failed emissions test...again [Re: huskyohilux] #930081 02/24/09 03:17 AM
Joined: Apr 2002
Posts: 3,567
Snowtoy Offline
Roll Me Over
Quote
I got an aftermarket, but bigger than the one I had before.
Still cheap, $100
I think I'm currently the world record holder in changing the cat out! Baught it at a shop 3 miles from home. Got home, removed the old one, cut off the flanges, welded them on the new cat, mounted it, took an emission test in another shop nearby and back to the guy who sold it in less than 1 hour. He paid $20 for the bad one...so $80 in total for the new cat
HC down in the 30 ish!


If you can find a stock one that is still good, pick it up for the $20, chances are by the next test the new one wont be working as well.

I put a hi-flow magnaflow on my truck in '04 after I rebuilt the top end. It past in '05, but the HC's & CO were much higher than any test in the past. In '07 it failed the first attempt for idle, everything else was fine, adjusted the idle and it barely passed. This month it failed again, not the HC's but the CO was .05 too high. I put the old oem cat back that had been sitting outside exposed to the elements four 4yrs on and retested it, and it passed w/o issue. The CO was 70% less, and the HC's were 45% less.


More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed
Re: Failed emissions test...again [Re: Snowtoy] #930082 02/24/09 07:04 PM
Joined: Nov 2006
Posts: 96
H
huskyohilux Offline OP
Getting the Wheeling Fever
I'm hoping for a life time of atleast a couple of years on this cheap one. The OEM probably cost 10 times as much, ofcourse they hold 10 times longer but it feels expensive to put out that much money at once. Probably better in the long run...but I'm a cheap bastard!

Re: Failed emissions test...again [Re: huskyohilux] #930083 02/24/09 07:30 PM
Joined: Sep 2003
Posts: 1,686
Staceman Offline
Body Damage is Cool
Still got the old one? Did it run OK before you swapped it out? If so, you could put the old one back in, then just put in the new one to get you thru emissions next time. Not that I would do it, but just a thought.


85 4Runner - With NEW Marlin 4.7 Gears!! It's a whole new beast!
Re: Failed emissions test...again [Re: Staceman] #930084 02/25/09 01:13 AM
Joined: Jan 2004
Posts: 383
Stevie Offline
Mudrunner
Now that the test is done and passed, a state EPA ramp checker would have a coronary right on the spot if he/she would look under the hood and chassis of this truck I know.
Headers, no smog pump, a bored-out cat. Wonder what mpg he gets? I'll ask him in a few months.


'80 4X4 Longbed
Re: Failed emissions test...again [Re: huskyohilux] #930085 02/25/09 04:11 AM
Joined: Apr 2002
Posts: 3,567
Snowtoy Offline
Roll Me Over
Quote
I'm hoping for a life time of atleast a couple of years on this cheap one. The OEM probably cost 10 times as much, ofcourse they hold 10 times longer but it feels expensive to put out that much money at once. Probably better in the long run...but I'm a cheap bastard!


I meant picking up a used oem one from a yard.

I did a little comparison between the oem one I have and the Magnaflow one. The catalyzing chamber of the oem one is 3.75 times larger(245 cubic inches to 65.625 cubic inches) than that of the Magnaflow, even though the oem one only looks like it is twice the size(it is twice the weight.

Here is a pic, the "X" is the size of the catalyzing chamber from screen to screen.
[Linked Image]

I think the hi-flow cats operate at the edge of efficiency in favor of performance.

I haven't measured the size of the catalyzing chamber on a standard after market replacement yet, but I know they are a lot lighter, and is why they don't last as long.


More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed
Re: Failed emissions test...again [Re: Snowtoy] #930086 02/25/09 07:42 AM
Joined: May 2006
Posts: 457
D
Davepet Offline
Mudrunner
By law in the US, OEM smog parts carry a very long warranty (75K miles sticks in my mind, but not sure), so they over-engineer them to last even longer than needed.

Better for the car company to charge the buyer a lot for a better cat than it is to have to replace a bunch for free.

Dave

Re: Failed emissions test...again [Re: Snowtoy] #930087 02/25/09 03:22 PM
Joined: Nov 2006
Posts: 96
H
huskyohilux Offline OP
Getting the Wheeling Fever
Well the problems continues...
the emissions test I took last weekend wasn't official and I went for the real one today and flunked again!!!
HC around 400-500, the others were good.
So I'm back were I started except I know it's not the cat that's the problem, except maybe it burns out really quickly because of the unburned fuel passing.

So what can cause unburnt fuel passing through to the exhaust?

Re: Failed emissions test...again [Re: huskyohilux] #930088 02/25/09 11:48 PM
Joined: Apr 2002
Posts: 3,567
Snowtoy Offline
Roll Me Over
If I read correctly you have done:
Tune-up and valve adjustment
Checked for vacuum leaks
fairly new O2 sensor
new cat.

The only other things could be timing, leaking injectors, leaking cold start injector, it could be the cam but I am not sure.

When you tightened up the exhaust manifold and down pipe connection, did you replace the gasket, or just tighten it up? You could still have a small exhaust leak that is allowing fresh air to be drawn into the exhaust and causing the O2 read lean and the ecu is richening the mixture.

Is it failing at both stages of the test, idle and highway rpm's?


More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed
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