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Old 07-23-2002, 11:53 PM   #1
bartalbee001
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Unhappy Cold Air Intake HELP!

I installed a K&N cold air intake on my '96 2.2L Legacy and I have been having a problem ever since. The intake is great, I love it, and the is a noticable difference in power. My problem is that when I stomp on the gas full bore the car hesitates. It just kind of surges and wont accelerate. The problem is some what hard to explain. I also will lose power on occasion when i accelerate out of a corner. If I accelerate smoothly the car can just get up and go. I Have tried many things but none of them have helped, like reseting my ECU, replacing my plugs and wires, cleaning my injectors and throtle body, I checked for vacume leaks, and my fuel pressure. I think it could be my timing because just before I Installed my intake I replaced my timing belt. I need help with this and I appreciate every little bit I can get. this problem is becoming very frustrating. Thank You.
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Old 07-24-2002, 12:11 AM   #2
moogooob
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Many people have tried the single point ground with good results(myself included) from this sort of hesitation. Take a look at the spg hesitation thread, that may be of some help.
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Old 07-24-2002, 12:24 AM   #3
Prez&SUS
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Many cold air intakes sacrifice low end torque for high end power, thats how they "work"
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Old 07-24-2002, 12:25 AM   #4
obyone
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I still say it's that slow rev action.

Situation: Cars at idle, I stomp on the throttle, and a half second later the engine finally starts to rev.

Situation 2: Cars at idle, I lightly press on the throttle to bring the revs to 1000, stomp on the throttle and the engine revs instantaniously.

Weird huh?

Oh yeah, I did a semi Single point ground job. (I was beginning to run out of uninjured fingers, so I stopped halfway through the mod.)
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Old 07-24-2002, 04:37 AM   #5
danci1973
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Quote:
Originally posted by obyone
I still say it's that slow rev action.

Situation: Cars at idle, I stomp on the throttle, and a half second later the engine finally starts to rev.

Situation 2: Cars at idle, I lightly press on the throttle to bring the revs to 1000, stomp on the throttle and the engine revs instantaniously.
I have a very similar problem. With my car it can happen at even higher RPM (up to 2000). For example, if I go up the hill and stomp on the throttle at 1500-2000 RPM, the car will bog down and loose power - I feel it would die if I wouldn't release the throttle (can't bring my self to try that).

The moment I ease off the throttle, it starts accelerating. After it's past 2000-2500 RPM, I can go nuts on the throttle, but it's OK then.

My setup is also similar to yours - stock intake tubes from the TB to the MAF, where I have a K&N cone filter inside a big (125mm dia) tube that goes to the fender wall.

I plane to re-install the stock airbox with stock filter to see, if it will make a difference. Lastly, I will re-install the silencer (of course, only to see what's up)...


D.
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Old 07-24-2002, 04:36 PM   #6
bartalbee001
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Im going to try the SPG and see if that works. from what I've read that maybe my problem. My intake consists of the K&N cone air filter and I replaced the factory tube. Another thing I should mention about the hesitation is my car will not go any where when it hesitates. It just kind of revs a little then boggs down over and over till I let off the gas. If I stomp the gas after 1000 rpm the car seems to work fine. So as I said I'm going to try the spg and I will let everyone know if it works. Thanks for the help.
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Old 07-24-2002, 05:55 PM   #7
danci1973
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Quote:
Originally posted by bartalbee001
My intake consists of the K&N cone air filter and I replaced the factory tube.
What did you do with all those hoses connecting to the factory tube (vacume, ...)?
Do you have a pic of your intake? I guess since my car is a '95 Legacy, it should look pretty much the same...

Quote:
Another thing I should mention about the hesitation is my car will not go any where when it hesitates. It just kind of revs a little then boggs down over and over till I let off the gas. If I stomp the gas after 1000 rpm the car seems to work fine. So as I said I'm going to try the spg and I will let everyone know if it works. Thanks for the help.
Yeah, that's EXACLTY what's going on with my car - I just *think* it happens below 1500-2000 RPM (not quite sure).
I have done the SPG mod already - no change. I might have chosen some 'wrong' grounding points and I will retry...

D.
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Old 07-25-2002, 04:30 PM   #8
mattjb
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Quote:
Originally posted by danci1973


I have a very similar problem. With my car it can happen at even higher RPM (up to 2000). For example, if I go up the hill and stomp on the throttle at 1500-2000 RPM, the car will bog down and loose power - I feel it would die if I wouldn't release the throttle (can't bring my self to try that).

The moment I ease off the throttle, it starts accelerating. After it's past 2000-2500 RPM, I can go nuts on the throttle, but it's OK then.


I have this *EXACT* same problem in mine. If i just mash the gas it almost dies, but if i let up for a split second and hit it again it goes like a bat outta hell.


I've done the grounding mod and that didn't really help this problem out but it fixed some other stuff.

-MB
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Old 07-25-2002, 11:09 PM   #9
Reciprocity
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Fuel filter perhaps?

NC
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Old 07-26-2002, 03:37 AM   #10
danci1973
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Quote:
Originally posted by dcrawford
Fuel filter perhaps?

NC
Wouldn't that cause even more problems at higher RPM where there is more fuel required? I'm just guessing... I'll check it out.

D.

PS: Where is the fuel filter?
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Old 07-27-2002, 12:29 AM   #11
bartalbee001
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[quote]Originally posted by danci1973
[b]

What did you do with all those hoses connecting to the factory tube (vacume, ...)?

There are three hoses coming off the factory tube. The large one I put in the same spot as it would be factory, The next hose fitting goes to a T-connector that is on the hose coming off the PCV. The third hose took a little work but wasn't hard. If you look at the factory tube. The hose for the the vavle covers goes into a T-connector that is attached to the factor tube all I did was cut that T off and ran my new hose to that and zip tied into a secure spot. You can also just go out and by a T if you don't want to cut the T off the factory tube. Hopefully I helped you out danci1973.

I did a spg yesterday, with six grounding pionts, but it didn't help my problem. so it looks like I'm back to the drawing board. If any one figures out the solution please post it here. The fuel filter is not the problem because I replaced mine last spring. I'm think the problem could be that my intake is allowing to much air to enter all at once, or I have a fuel problem but I check the fuel pressure and it seemed to be fine, I also had my Injectors cleaned. If I do ever figure out what is wrong I will be sure to post it, so all of us will be able to fix this horrible problem.
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Old 07-27-2002, 12:32 AM   #12
Costas
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stick bolts in em and close them off...

C
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Old 07-27-2002, 12:33 AM   #13
Costas
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Sorry I didnt read it fully...


Check for air leaks..

C
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Old 07-27-2002, 12:35 AM   #14
bartalbee001
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I already checked for vacume leaks and I checked my vacume pressure and I found no problem.
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Old 07-27-2002, 12:47 AM   #15
nomorefocus
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do those cars have a MAF? I had a similar problem in my Focus that I had after cleaning it with some rubbing alcohol the hesitation went away. I had over oiled my K&N filter and some got on the MAF sensor.
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Old 07-28-2002, 05:54 PM   #16
danci1973
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Quote:
Originally posted by nomorefocus
do those cars have a MAF? I had a similar problem in my Focus that I had after cleaning it with some rubbing alcohol the hesitation went away. I had over oiled my K&N filter and some got on the MAF sensor.
Mine does, but I'm pretty sure this was happening even before I installed the K&N. But I'm not so sure whether it was happening befor I removed the intake silencer.Hmmm...

D.
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Old 07-28-2002, 07:36 PM   #17
Prez&SUS
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My 95 impreza hesitated/surged really badly, i thought it was a fuel problem after changing the fuel filter and no fix i checked the spark plug wires and plugs, turns out i had a bad wire. as if the 1.8 isnt weak enough, try driving a three cylinder!


hope you can fix your problem
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