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Old 07-02-2018, 11:40 AM   #11
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Join Date: Jul 2013
Location: So Cal
Posts: 3,471 may not need a cat.....

If you are curious and it's not close to smog-test time, as mentioned just take it to a smog station and have them do a practice blow with a sniffer.

..Otherwise, just enjoy the ride until the next smog test is required.

2008 E350 RB passenger 4WD SMB penthouse
2013 KTM 350 EXC
2008 KTM 250 XCF-W
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Old 07-03-2018, 05:30 AM   #12
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What model year is your E350? Is it the extended body with raised roof?

I ask as I have an '05 E350 with raised roof, formerly a wheel chair lift equipped Club Wagon---that was the first year of the "fly by wire" throttle system replaced the cable opening from years previous (1997>2004).

I'd characterize its performance as "sluggish" especially from a dead stop. When at freeway speeds in top gear its responsive enough for a big vehicle.

Certainly not doubting the cat could be an issue but could just be the nature of the vehicle too---that's a lot of sheet metal and fiberglass to move down the road.

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Old 07-03-2018, 03:22 PM   #13
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Originally Posted by lashidalgo View Post
The dealership suggested me to run a cat test to verify their hypothesis, at that point, after been charged a lot of money and having a really bad experience there, I didn't want to keep been ripped off so I took the van out.

The van runs, and I get about 350-400 miles per tank (stock one). It also has a fiberglass high top which makes it less aerodynamic I guess.

I do think that the performance should be better, I take a while to accelerate.
Again, the van engine is running smooth, It's not burning extra gas or oil, it just feels underpowered. I've driven it over 2k miles after the fix without any issue/lights.

So I would be looking to bring it somewhere for a cat test, based on that Ill probably go with the Magnaflow direct fit CARB compliant one.
Do what I did. Put on a cat bypass which amounts to a straight pipe. Made
my 6.0 run free and easy. If you keep the van you'll never have to smog it again anyway. Another good thing you won't be starting brush fires along the
highway. I live in Ca.
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Old 07-03-2018, 03:52 PM   #14
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Originally Posted by Beasty Boy View Post
If you keep the van you'll never have to smog it again anyway... I live in Ca.
In CA it depends which smog district you live in.
2003 E-350, 5.4 V8, 2x4, LSD 4.10, WeldTec 6" lift, SMB, Penthouse
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Old 07-03-2018, 05:06 PM   #15
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I personally would drive the snot out (many tanks of fuel) out of it so the cat gets very hot and burns off the junk buildup. But if it didn't clear up I'd find a stock cat from soneone selling and DIY

2001 E350 PSD w/ a bunch of stuff.
And had three other E350s...
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