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Old 02-07-2002, 03:40 PM   #1
fig
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2002 WRX
silver

Question Intakes?

I just had a question about cold air intakes.
I just put in a APS intake and the car runs rough at idle and the acceleration isnt so smooth either. I havent run the car alot since I put it in , but is this normal , Will the car smooth out after a while. Its almost like the car is dumping too much gas in to make up for the added air. Any info?
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Old 02-07-2002, 04:09 PM   #2
AKSubie
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Could be that it just needs to "learn" with the new intake. Did you make sure to reset your ECU and then let it sit and idle for ~10-15 min for it to recalibrate? That would be the only thing I could recommend.
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Old 02-07-2002, 04:30 PM   #3
WRXnFX
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You need to reset your ECU after installing the intake. Here is how you do it:

Method One
With the engine at operating temperature, turn the engine off. Place gear shift lever into park (auto transmission) or out of gear (manual transmission). Locate the two ECU check connectors, for most cars they are located under the steering column and consist of a black plastic male and female connector, and a green male female connector. The exact location of the connectors varies with the different year models, but generally they are located under the steering column on the drivers side (note: sometimes they are still taped over with some small amount of plastic tape). With the ignition OFF connect black to black and green to green. Turn on ignition, do not start the engine, (and for auto transmission, cycle the gearshift lever from park to neutral and back to park ), depress the accelerator pedal to full throttle and hold for a few seconds, and then release. Start engine and then drive for at least one minute, keeping road speed above 10mph. ECU is now re-set. At this point the check engine light should start to flash the all clear signal (steady 1/2 second interval flashes). If the check engine light does not flash, or indicates some other sequence, there is a fault present in the system, and should be professionally checked for necessary repairs. Stop the car, turn off the engine, and disconnect the plugs.

Method Two
According to conventional wisdom, you need to disconnect the battery for at least 30 minutes. Reconnect the battery after this time, and then idle the car until the cooling fan cycles at least once to reset the timing maps (approximately 10 minutes). Drive the car as usual.

Winslow
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Old 02-08-2002, 11:22 PM   #4
RallyX13
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Just when I think I know a thing or two about Subies, Winslow comes along and humbles the hell outta me!!

Kris
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Old 02-09-2002, 12:00 AM   #5
AK_2002_WRX
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Exclamation

is it the APS-COBB one? on their site it says that their intake shouldn't be used without a UniChip. if the ECU reset doesnt work, this may be the problem.

heres the thing from the site
Quote:
This system was designed to be used with a properly tuned Unichip system. Installation of intake without a Unichip properly tuned on your vehicle may result in less than optimal results.
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Old 02-09-2002, 03:02 AM   #6
RawCode
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From my Ganzflow intake....

PROCEDURE TO RESET ECU, TO QUICKLY RE-TRAIN AIR/FUEL RATIO CALCULATIONS:
1. Be sure you have your favorite fuel in the tank and running through the engine (after about 40 miles driving after a
fill up if you changed grades or brand)
2. You may first try to use 87 Octane, unless you are running a high compression engine or you are at a very low hot
altitude. This is what I was told.
3. Disconnect negative battery terminal and let the vehicle sit for 1 hour.
4. Reconnect the battery, start the car (don't even think of touching the gas!!).
5. Let it idle for at least ten to fifteen minutes, I usually let it idle for 20 to 30 min +.
6. Turn engine off, turn back on and go for a hard drive. Bounce it off redline once or twice in 1st and 2nd. After that,
a wide mix of driving styles (fast, slow, medium, city and highway) is fine.
7. Over the next few weeks, the ECU will continue to learn, and any immediate drop in gas mileage (city driving) is
temporary and should improve to normal. Highway mileage doesn't seem to temporarily drop.
So, that's it. Install and enjoy!
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Old 02-09-2002, 04:06 AM   #7
fig
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silver

Unhappy intakes

Not sure if its the cobb one or not, but I did reset it the disconnecting the battery method and it runs ok ,but then after only about 3 or 4 miles the check engine light came on. The car runs good and there is a definite change with the intake. If I take the intake off the check engine light goes out and all is back to normal. I will try resetting the ecu the 1st way winslow said ,but I cant find the other black connector, I found the 2 green ones, but only one black one.
I might just need a properly tuned unichip.
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Old 02-09-2002, 04:08 AM   #8
KapaFool
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Cool

Hey Matt, I would check on that APS intake stuff if ak_2002_wrx is correct that might be bad. Where do you get this experimental stuff anyway? What do you have next unstable high octane race fuel?

Last edited by KapaFool; 02-09-2002 at 04:07 PM.
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Old 02-09-2002, 03:18 PM   #9
SQUAD_907
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yah...how did u get that prodrive ecu?
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Old 02-09-2002, 03:32 PM   #10
fig
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silver

Lightbulb ecu

I got it and I might have to get it back. The intake is supposed to run with it. I'm pretty sure of that. The intake sucks in massive amounts of air. I returned the ECU, and I can get it back , but if there is another solution besides getting a different intake , that would be good.
Matt
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Old 02-09-2002, 05:20 PM   #11
WRXnFX
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How did you go about buying this stuff and not know anything about it. THE PRODRIVE ECU IS BAD!!!! You put that in your car and you might have more problems than just a CEL. The APS intake is a COBB product. That is why you see APS/COBB products on their site. The intake doesn't need to be used with a Unichip. If you do use it without a Unichip then you'll get the maximum performance benefits. It will work without it. You failed to mention that you had MAF problems before. Didn't you take your car in for service because of a previous CEL light problem related to the MAF sensor on the intake? What did they do to your car? Also, when you were talking to me you called it an O2 sensor. Which was it? The O2 sensor or the MAF on the intake? When doing any maintenance in the MAF area, you should make sure not to be rough with it. You might have a bad MAF. One way we could check this would be to replace your MAF with another member's MAF. If it works then go to Subaru and order another. It's quicker than putting your car in for service. Winslow

Last edited by WRXnFX; 02-10-2002 at 12:13 AM.
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Old 02-09-2002, 08:06 PM   #12
RawCode
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The reason why the cobb intake need the Unichip to get full performance is because the intake has a different Diameter than the stock one. The unichip send a compensated signal to the ecu so it will be more accurate with the airflow signal.
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Old 02-09-2002, 09:18 PM   #13
SQUAD_907
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yah...what rawcode said...that's probably why he's getting the cel...
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Old 02-09-2002, 10:22 PM   #14
KapaFool
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ditto....
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Old 02-10-2002, 12:14 AM   #15
WRXnFX
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He had MAF problems with the stock intake before the aftermarket install.
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Old 02-10-2002, 02:33 AM   #16
whtdvl
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I'm running no intake right now. Sensless restriction.
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Old 02-10-2002, 02:50 AM   #17
KapaFool
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I would suggest you take off your panty hose and use that as a rough air filter.
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Old 02-11-2002, 02:09 AM   #18
AK_2002_WRX
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Question

Quote:
I'm running no intake right now. Sensless restriction.
are you really running no intake what about your MAF sensor?
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Old 02-12-2002, 02:53 AM   #19
whtdvl
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velcro'd it to my intake midpipe.
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Old 02-12-2002, 10:34 PM   #20
AK_2002_WRX
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Question

have you guys had problems with your injen or AEM CAI ? what kind of performance gain did you notice?

Quote:
velcro'd it to my intake midpipe.
hows it perform/sound?
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Old 02-13-2002, 02:46 AM   #21
WRXnFX
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I haven't heard of any problems except for the APS/COBB problem that fig is having. I'm not sure if the tumble I hear when the BOV blows off is related to the intake or the BOV. It all started when we changed the intake. You'll have to ride in my car. I know it isn't just my car that makes that noise but Eugene's car does the same thing. I noticed some butt dyno performance gains down low. The car seemed to be able to come on boost sooner. Winslow
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Old 02-13-2002, 02:39 PM   #22
fig
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Default Cobb tuning

I talked to Cobb Tunning today and they said the check engine light was because of the intake and they have a fix for it coming out in 4 to 6 weeks.
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Old 02-13-2002, 07:57 PM   #23
AK_2002_WRX
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Talking

a ride in your very fast car would be nice
Quote:
. You'll have to ride in my car
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Old 02-13-2002, 08:41 PM   #24
KapaFool
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I would like to try everyones car just to see the difference. WrxnFx74, WHTDVL, Fig (if he ever gets his parts workin). I also heard that someone has a Stage2 TXS. I can't forget Jakes subie because I want to see if his suspension setup is as good as I think it is.

Last edited by KapaFool; 02-14-2002 at 12:39 PM.
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Old 02-14-2002, 05:53 AM   #25
WRXnFX
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I met a guy named Min last weekend that drives a silver WRX. It has a TurboXS stage 2 kit and it is very fast. He has the MRT intake with no problems.

Fig, glad to hear that you figured out your problem.

I hear WHTDVLs car is really fast, too.

Winslow
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