Well they lied. The Walker cat wasn't at all what he said it was - 13"
core. It was a 13" CAN with 5"s of nipple to make it 18". Makes me
wonder what else the Walker tech was wrong about, like the temp diff
test?
Anyone know who the Manufacturer of the Dakota Cat Converter is?
Otherwise my last choice is a Magnaflow 94406 which is 18" but still
has the same 5-6" core but with a resonator. I put one on my Bronco
4x4 and it got very good scores on the smog test.
Ron
--- rws <rwsam2002@yahoo.com> wrote:
> I did some more checking and it seems that the cat converter is bad
> or
> not doing a complete job of cleaning HCs and Nox.
>
> I did the vacuum test at the intake manifold and @ idle it's 19"/hg
> when I raise the throttle quickly it goes to zero, if I raise the
> idle
> to 1500-2000 rpms gradually the vacuum goes up about 4"/hg but in
> about
> 20-30 seconds drops back down to 19"/hg. There may be a plugged up
> converter that is causing this, right?
>
> I let it warm up for around 20 minutes and did a temperature test on
> the front and rear of the converter. There is only a 25oF
> difference,
> not the 50-100oF that I'm told by the Magnaflow Tech it is suppose to
> have. Also, I may not of got it hot enough because the two temps
> were
> 275/250oF.
>
> When I asked the Walker exhaust tech he said that the temp test was
> not
> that accurate nowadays because of changes to the core materials.
>
> The Dodge converter was 20" long and heavy. The Magnaflow is 12"
> and
> 7lbs. I called Walker Exhaust and they have a longer heavier unit
> and
> their brick is 13" whereas the Magnaflow was only 6". Total length
> of
> the Walker # 15042 is ~ 18-19" Anyway my NAPA store has it in stock
> and @ $110 with my AAA card (10% off)
>
> Warranty of the converter at Walkers is 25k miles or two years, I
> believe the others are a lot less, 6 months or something like that.
>
> I haven't tried it yet but there is a site www.smogtips.com that is
> suppose to have tech feedback via email.
>
> Just looking back at my old smog test results and at one time the HC
> was down to just 1 PPM for HC. When I'm standing next to the exhaust
> pipe, I can't smell anything abnormal. When I drive on the freeway I
> can smell other cars with pollution and that's mainly when traffic is
> in gridlock, which we have a lot of.
>
> I hope to get it back up to the 18mpg it once had. Last tank I got
> 12.6mpg and driving was 25% in the city and rest on the freeway.
>
> I have a vac pump and I'll check the EGR valve but don't expect it to
> have problems sine I last replaced it. Just checked the price at
> NAPA
> and they said $115. ouch!
>
> My ignition stuff looks OK by just looking how the plugs are burning
> the fuel. Which is a nice lite tan and clean porcelain and clean
> electrodes - using Autolite platinums. Do they get good or low
> mpg's?
>
> This is OT but does a lap top PC Oscilloscope converter or adapter
> exist? I was looking at a very nice SW/HW $200 OBDII Scanner from
> Autotap.com but want it to be useful for OBD 1 also. Btw, they have
> a
> great tutorial on Sensors.
>
> Going to NAPA now . . .
>
>
> Ron in Kali
>
> ===============================================
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