Whats going on everyone, I need some help to figure this out here, 2 months ago i installed a K&N typhoon cold air intake.

The performance definitely showed improvements, but yesterday, I was coming home from work and it suddenly got lazy (as if its factory). The acceleration lacked a bit.

I notciced that that vaccum sound wasnt as loud as before, so I'm starting to wonder if something had shut off. When I got home, I left the XB for about 4 hours and came back to start it. The vaccum sound in the intake was back to being obviously noticable. So i drove it down the street, and the power was back, but not for long, it went back lazy after about 10 mins driving.

So I'm trying to figure out, what is it lacking, or does the intake system ease off in hot temperature days?

K

 

Check the connection on your MAF it may be loose or a wire could be pinched or broken or something, but if you had a Scan Gauge II ,it may have picked up the malfunction for you. If you get a chance pick 1 up it's well worth the $. Good Luck

 

def sounds like the MAF...

 

check your hose clamps on the intake, you might have one that is loose and it can cause your symptoms.

 

Good 1 didn't think about that at all

 

Thanks guys, I'll look into it, I had checked the MAF and it seems to be connected properly, non of the wires look damaged and there is slack available so nothings pulling. Should i unplug it while its rrunning to see if it is indeed working, or could it be a general malfunction in the maf sensor?

 

NOOOOO!

never disconnect while the car is on.

the problem is either a connection issue between the MAF and the motor or the MAF is having issues.

normally, these problems would be present all the time and not come and go.

does this problem happen at certain RPM's only?
in a certain gear?
did you get gas from a new place?
how many miles do you have?
what does the car feel like when the power cuts out? does it cut out all at once or a slow decrease?
does the motor run rough when there is less power?
does it still rev to redline with the power loss??

 

[quote="dgHotLava"]Ok the wires seem to be fine between the harness and to the connecting plug, im not sure about inside the harness.

However, I started it once again about 30 mins ago and the intake sounds like its kicking in, I drove to grab a coffee and back to work, took about 15 mins, by the time i came back, I could barely hear the vaccum sound.
But to answer your questions:
I got gas at the place i regularly go, I'm at 6500 miles now, the car feels lazy in pick up when i give it throttle, the power decreases gradually, as i drive for a while ill notice the change when i hit the gas. Or trying to durastically overtake whereas before, I can give it gas and it will move considerably fast. I can still get it reving high tho, and the motor doesnt run rough. So its really weird whats going on.

whats your diagnosis dghotlava?

 

turn off the a/c haha. your intake is heating up, drive and when it drops off, carefully feel how hot the intake is, my ranchero, i know a 60's car, no maf, when it gets warm, and the intake gets untouchable hot from the carb, i prob loose like 25-30wheel hp because the ingoing air is so hot. go ahead and check that if not that, then well we'll think o something else

 

plain and simple, on a hot day the car just isnt going to run as hard. Its like pulling timing, it just slows ya down.

...at the same time though, sounds like you could possible have a vacum leak. I highly doubt it, BUT...check anyways. Look at the PCV line which runs into your intake and check for any air that may be escaping (i.e. a pin hole).

It makes complete since that the car feels like its dying down a little bit after warming up on an already hot day.

One last thing you could try is to pull the EFI fuse for a few minutes and then pop it back in (obviously pull the fuse while the cars off). This resets the computer, and if the computer is pulling any extra timing due to enviromental conditions, the stored "short tearm" map will be deleted, and the car will begin to work off long tearm memory and current monitors.

A little confusing, but give it a shot.

 

this might be a lame guess, but check and make sure your filter is still on it. my friend's k&n was great and then suddenly his car started shutting off. when i was installing fog lights on it we found that his filter had fallen off...needless to say, it works just fine again.

like i said, lame, but couldn't hurt to look

 

like they said ^^^.

it sounds like you have a leak in the intake (between the MAF and the motor....or you should be running higher octane fuel because of the heat (it will pull the timing back more and more as it gets hotter (this is done to prevent pinging or detonation of the motor).

you can pull the ECU fuse (fuse box under the hood) for a min or two...this will reset anything the ECU has learned...

and my favorite...the MAF could be shorting out or be dirty...did you just put on the intake??? did the filter have any oil coating on it???(this will get sucked into the intake and clog the MAF causing this kind of problem)

 

If you MAF was bad you would have a CEL.

 

Hey everyone thanx for the replies... Ok based on all your advise given I checked the hoses and they seem fine, I took off the MAF and its clean as a whistle, everything looks good . I did take off the EFI to erase what was mapped out, and put it back on after a few mins... I did get the acceleration back, but I'm still finding the tranny isnt shifting to the gears to get that specific torque when you wanna punch it to overtake or catch up like it used too... So Im still gonna look and see whats up here.
But non the less its working better then before thats for sure.

 

This might sound like a sales pitch but you should try a scan gauge II, I just love mine since I've had it a couple of my friends have had the advantage of being able to use mine also. It may bring up whats going on with your ride. Good luck once again with your problem

 

UPDATE:

Well I finally got the power restored. I took it to Toyota and they did a secondary test, after a few days ago, it was idling very rough. So they had changed the plugs, and they also changed the oil. They also used some type of toxic cleaner to clean the MAF.
they found that although it was relatively clean they still went ahead to clean it spotless. Once the MAF was put in, the plugs were changed and even the simple oil change.

Everything had come back normal, smooth idling, very good power, and no hesitation on top end acceleration.

Thanks to everyone on here who helped advise me what to do. You all are the best.

K

 

mine was doing the same, for a day or two.. run fine in the
morning and fall on its face in the afternoon, I found that the
silicon line to the valve cover from the intake pipe, after the
MAF, was getting loose in the heat of the day and causing a
post MAF leak. The little sprung clamp was barely holding on
cold, and when the hose warmed up (softened) it would
looseley slide off the valve cover end.. put a real clamp on
it.. no problems since.