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New intake makes my car slow!

 
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Old 01-13-2014, 04:29 PM
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New intake makes my car slow!

Sorry to start with a long question but here goes: I just put an AEM short ram air intake on my '97 Prelude over the weekend. I'm positive I put it in correctly, although the included instructions were not all that helpful I was able to look up some tutorials online.

I got the coupler onto the throttle body and plugged in the intake pipe, clamped it on both sides. I connected the line from behind the valve cover to the small port on the intake, put the sleeve on and clamped on both ends of the sleeve. Put the filter on the other end and clamped it onto the pipe where it is right behind the headlight (I had not removed the resonator when taking out the stock intake, btw). Also bolted down the intake in one of the holes where the stock intake box bolted down. All there is to it, right?

Went to drive it for about 20 mins and it seemed to run fine. Next day I took it out and I was unable to push the engine over about 3500-4000 RPMs. After that the throttle would not respond (RPM would either stick at 4000 or drop back down). I was able to top out about 60mph on the highway in 5th gear, but no faster than that.

I put the stock intake back on and it continued to do the same thing. Before trying to change the intake in the first place I'd had no problem exceeding 4000RPM or 60mph.

I called AEM to see if they had a suggestion, although at that point I didn't suspect it was their product. They were very helpful on the phone and he said the car might be going into "limp mode" and that unplugging the ECU fuse and plugging it back in might be worth a try. Only after he asked me some questions did I remember to mention that I had an engine light on because of a known bad catalytic converter. He said the cat might be clogged and so the increased airflow is causing it to go into limp mode.

I think at the end of this all I'm going to just have to get my cat-converter fixed but is there anything else I should try first?
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Old 01-13-2014, 04:32 PM
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Re: New intake makes my car slow!

fix the reason why the CEL came on and take it from there
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Old 01-13-2014, 04:50 PM
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Re: New intake makes my car slow!

could be vacuum leak, check your lines and Throttle Body.. also def get the CAT fixed, that may be the reason its going into limp mode... like SoFlaKidd said, adress the CEL issues then go from there
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Old 01-13-2014, 06:00 PM
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Re: New intake makes my car slow!

Cat-man-do
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Old 01-13-2014, 06:40 PM
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Re: New intake makes my car slow!

I vote for the cat. Mine came apart on the highway one day and created a blockage. The car was absolutely gutless. Made all the right sounds, but had zero power wouldn't accelerate past 100 (or 60mph). No CEL for me though, I found that odd.
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Old 01-14-2014, 04:17 AM
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Re: New intake makes my car slow!

Might want to check your CEL again, there may be a new code you are not aware of, because if you already had it for the cat, and it drove fine, there should be a reason why it's in limp mode now.
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Old 01-14-2014, 01:20 PM
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Re: New intake makes my car slow!

Figure out what code(s) your vehicle is throwing before diagnosing anything else.
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Old 01-14-2014, 01:45 PM
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Re: New intake makes my car slow!

And if I also remember correctly, since you did add something different to the vehicle, the ECU may not recognize that new volume/denisty of air going into the throttle body, so you may to unplug your battery for a certain amount of time for your vehicle to go into "learning mode". Just do that and drive your car normally as you would for 1-2 days. I may be wrong, but I had a similar bottle-necking issue before and that fixed it. Mine wasn't my cat. But it can vary I guess.
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Old 01-14-2014, 02:18 PM
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Re: New intake makes my car slow!

I took some pics with the AEM intake on, in case anyone sees something incorrect that I don't see...
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Old 01-14-2014, 03:53 PM
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Re: New intake makes my car slow!

PGMFI cars have a map sensor which reads the pressure in real time. Changing the intake does not change the volume of air, nor the speed of the air entering the engine.

Plus the short ram intake is no different than stock other than it being metal with a cone filter.
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Old 01-14-2014, 04:56 PM
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Re: New intake makes my car slow!

Hot air is less dense than cold air!
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Old 01-14-2014, 09:01 PM
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Re: New intake makes my car slow!

Did somebody say cat?
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Old 01-15-2014, 09:33 AM
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Re: New intake makes my car slow!

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Originally Posted by Qluder View Post
Hot air is less dense than cold air!
Correct. But that has nothing to do with this.

Did you take any sensor connectors off during the install?
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Old 01-15-2014, 11:06 AM
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Re: New intake makes my car slow!

Been trying to post these pics of when it had the new intake, though I put the old one back on since then. I'm pretty new to working on cars so I'm not sure what the sensors look like but I don't think i took any off. There is the plug that goes in by the throttle body but I got that plugged back in.







Anyway she's in the shop now and they're gonna look at the cat...
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Old 01-15-2014, 11:41 AM
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Re: New intake makes my car slow!

X2 on the sensor question.

CAI vs oem air box makes a slight difference. But it should not make the car suddenly become slooooow.

However a bad cat will.

Did you plug the vacuum line on that little black box that used to be hooked to the stock intake near the battery?
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I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

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Last edited by bykfixer; 01-15-2014 at 11:44 AM.
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Old 01-15-2014, 01:48 PM
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Re: New intake makes my car slow!

Not sure why mods won't let me post images, will try these as links. This was after installing the new intake (though I 've since put the stock one back in). Car is in the shop now they're looking at the cat.

http://s8.postimg.org/g8awxjhxh/image.jpg

http://s8.postimg.org/e2gm31eh1/photo_1.jpg

http://s8.postimg.org/kipkt4n0l/photo_3.jpg
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Old 01-15-2014, 02:30 PM
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Re: New intake makes my car slow!

Just stating the facts!
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Old 01-15-2014, 03:14 PM
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Re: New intake makes my car slow!

Again, did you remove the connectors on either or both the tps or map sensor on the throttle body
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Old 01-15-2014, 04:22 PM
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Re: New intake makes my car slow!

Can't belive the thread got this far and OP didn't clear the CELs. How about that first?
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Old 01-15-2014, 08:04 PM
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Re: New intake makes my car slow!

Don't know what tps or map sensor are, will have to research. There was an electrical connection on the throttle body which was unplugged and then plugged back in upon completion. Have disconnected the battery to reset several times and CEL went off but problem persists. The CEL for the cat would go on and off sometimes before I had this problem.
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Old 01-15-2014, 08:57 PM
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Re: New intake makes my car slow!

Throttle position sensor tells the computer how far open the throttle is. It is located on the back side of the throttle body. The map sensor reads the absolute pressure of the incoming air and is the main sensor in the programmed fuel injection system and is located on top of the throttle body. The TPS and MAP sensor share the same connector and can be plugged into each other. It happens all the time with new guys. The engine will idle perfect but it runs terrible upon giving it throttle. Doing so will also not give a check engine light.

If you took pictures of the connectors which show the wire colors I could tell you if its right or not or you could just swap them and see what happens.
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Old 01-15-2014, 10:39 PM
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Re: New intake makes my car slow!

Damn I'll have to check that out, but it's at the shop now so I'll go ahead and have them look at the cat. It's true it was idling fine and nothing else funny but the throttle response
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