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-   -   Straight intake causes a rough takeoff (http://www.focusfanatics.com/forum/showthread.php?t=302148)

Cupooterluvr 11-12-2012 11:06 PM

Straight intake causes a rough takeoff
 
I took out the resonator and the MAF tube and replaced it in that little corner with a straight pipe and a cone air filter. I cut a rectangular hole in the piping for the MAF and sealed it in pointing the right direction.

Initially I had the check engine light but I was told I should disconnect the battery to reset the emissions settings. That fixed the light (I drove around for about ten minutes and it didn't come back on), and it seems to have power still, though I'm not sure if it's the same amount or more or less.

Anyways the problem I'm seeing now is that from a takeoff if I go slow like you normally would just driving around at about 2000 RPM it jerks a bit like it's starving for air or something. Could this be as a result of the filter?

Give me until tomorrow and I can post pics.

koke'sfocus 11-13-2012 02:37 AM

The maf adapter it has to be the same size as the oem or can be fixed with a tune the u can put inside a velocity stack or something so it can be the same sizes or the maf is not gonna read good the inner size is iirc 2.5"
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sam fisher 11-13-2012 02:52 AM

put the maf back in the tube it goes in and put the filter on the end of that . but thats only if u dont mind dremeling ur maf tube a little:D

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AllCarFan 11-13-2012 08:40 AM

wait until you drive the car a second time...that CEL will be back. what is the code?

1turbofocus 11-13-2012 09:43 AM

If you want to keep that set up you made you will need a custom tune , let me know if I can help

Tom

Cupooterluvr 11-13-2012 11:29 AM

Quote:

Originally Posted by AllCarFan (Post 4453066)
wait until you drive the car a second time...that CEL will be back. what is the code?

P0171 IIRC, "Engine too lean" is what the reader said.

I think I might try the "stealth" intake mod but I need to know if that runs a risk of getting wet since it rains so much here.

mikebontoft 11-13-2012 11:53 AM

I'm sure it would be less risk than the tube you made.

how big is the tube anyway? that's your problem though I'm sure

Cupooterluvr 11-13-2012 12:01 PM

Quote:

Originally Posted by mikebontoft (Post 4453386)
I'm sure it would be less risk than the tube you made.

how big is the tube anyway? that's your problem though I'm sure

It's a 3 inch tube I think. Basically same diameter as the flexi-tube that comes straight out of the throttle body.

sam fisher 11-13-2012 12:44 PM

doesnt the diameter of where the maf goes in need to be the same ? or am i trippin?

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mikebontoft 11-13-2012 12:51 PM

is the inner diameter the same though? someone mentioned it might be 2.5" ID. those rubber intake tubes are probably a 1/4" wall so that would make sense.

its reading lean because the inner diameter is bigger than stock so its letting more air in than it thinks.

try to find a smaller or thicker tube... match up the I.D. and give it another try.


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