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Old 08-09-2008, 06:02 PM #1
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Observations after removing the hydrocarbon filter

So I removed the HCF about a month ago. I have a few observations that I thought I would share. First one is that the sulfur smell seems to have been reducecd significantly. I have done the TSB for it and it really didnt do much. It seems that now I can actually punch it and not have to worry that I will pass out from the smell.

My second observation happened when I went to Huntington Beach, CA which is about 290 miles from here in Las Vegas. I had 7 people on the way there in the 4R including our luggage and a hitch luggage carrier. 5 on the way back. Did about 70 mph avg and got around 17 mpg. I had over a quarter tank when I got back to Vegas which has never happened before on a trip to Cali.

No I have not done any scientific calculations on my mpgs before and after the removal. These are simply observations. The car also does not rev up then drop down when I start it.

Anyone else removed the HCF and noticed any changes?
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Old 08-09-2008, 10:43 PM #2
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Re: Observations after removing the hydrocarbon filter

Quote:
Originally posted by LV4R
So I removed the HCF about a month ago. I have a few observations that I thought I would share. First one is that the sulfur smell seems to have been reducecd significantly. I have done the TSB for it and it really didnt do much. It seems that now I can actually punch it and not have to worry that I will pass out from the smell.

My second observation happened when I went to Huntington Beach, CA which is about 290 miles from here in Las Vegas. I had 7 people on the way there in the 4R including our luggage and a hitch luggage carrier. 5 on the way back. Did about 70 mph avg and got around 17 mpg. I had over a quarter tank when I got back to Vegas which has never happened before on a trip to Cali.

No I have not done any scientific calculations on my mpgs before and after the removal. These are simply observations. The car also does not rev up then drop down when I start it.

Anyone else removed the HCF and noticed any changes?


HCF? The filter in the vapor tank (charcoal canister in the old school vernacular)? Having an effect on the smell is interesting.


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Old 08-11-2008, 12:09 PM #3
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Re: Re: Observations after removing the hydrocarbon filter

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Originally posted by CJ3Flyr


HCF? The filter in the vapor tank (charcoal canister in the old school vernacular)? Having an effect on the smell is interesting.


The Hydrocarbon filter, I used HCF for short . It is the filter after the air filter that requires removing the divets to get it out.
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Old 08-11-2008, 01:23 PM #4
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Got it, thanks. I did not understand it's purpose. Does it have a replacement schedule? Did you just decide give it a try outta the blue or did you read of someone doing it on a FJC or something?

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Old 08-11-2008, 03:49 PM #5
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I actually was reading on tundrasolutions that guys were doing this with their tundras and seeing positive results. I figured why not try it. I guess it would be the same thing as using an aftermarket cold air intake. The filter is to prevent the escape of unburnt fumes after turning the engine off.
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Old 08-11-2008, 04:00 PM #6
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Quote:
Originally posted by LV4R
I actually was reading on tundrasolutions that guys were doing this with their tundras and seeing positive results. I figured why not try it. I guess it would be the same thing as using an aftermarket cold air intake. The filter is to prevent the escape of unburnt fumes after turning the engine off.
Very cool... I might give it a go The amount of HC that can escape from a sequential fire FI that shuts the injectors off when the engine shuts off has got be near 'nil.

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Old 08-14-2008, 10:59 AM #7
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I removed my filter box and took a look at the filter.
Looks EZ to remove but I have not done it yet.
IMO it looks like it would restrict airflow.
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Old 10-19-2008, 07:39 AM #8
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Bump- LV4R, update please

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Old 10-19-2008, 11:17 AM #9
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did you drill the divets out ? was the air box still mounted on the engine or did you remove it to take the filter out? i was wondering about that filters purpose. thanks for the info.
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Old 10-19-2008, 01:00 PM #10
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Remove the box, set on a bench and drill em' out.
Thats what I will do when I get around to it.
That filter has to resticting some air.
Fook the carbon foot print
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Old 10-20-2008, 04:01 AM #11
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pics please?
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Old 10-20-2008, 10:27 AM #12
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So, am I correct in assuming that the HC filter would be eliminated by installing an aftermarket cold air intake anyway?
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Old 10-20-2008, 05:13 PM #13
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Quote:
Originally posted by RoarFunner
So, am I correct in assuming that the HC filter would be eliminated by installing an aftermarket cold air intake anyway?
Absolutely. Pretty easy removal and you can do it with it still on the engine. I just drilled one of the lower ones out then yanked it out.
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Old 10-20-2008, 05:15 PM #14
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Quote:
Originally posted by CJ3Flyr
Bump- LV4R, update please

Bought a new Sequoia over the weekend and sold the 4runner . The only thing I can tell you is that my mileage seems to have stayed the same with a possible increase in power.
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Old 10-20-2008, 05:23 PM #15
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I removed mine today.
EZ to do and took less than 30 minutes.
I removed the housing and drilled out the plastic rivets.
Drill only .125" deep so you don't ruin the housing.
I then just used an exacto knife to shear off the drillled plastic rivet.
EZ, EZ to do.
Seems like better throttle response from 60mph +
Too soon to tell if mpg will increase

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