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has any body had any problems with the amzoil air filter? i think i have traced hesitation problem between 3400 and 4000 rpm(feels like the ecu is pulling timing there) to the filter . iam going to put the stock filter back in again and see if itsmooths out one more time. i also have the gasket in the 'big air box' so i have experiment there as well. hopefully some one out there can save me a lot of time and tell what will work the bestin my99s???? :( :confused:
 
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Well it's not filter-specific. IIRC my '01 had that hesitation with the K&N, and it's got it now with a Cobb/PRM filter too. I think it had it with the stock filter, but that was so long ago I can't recall. It's too much work to go back to stock just to check so I'm not going to bother, besides, it pulls HARD everywhere else and is a bit faster. I'm going to stick it on a dyno in a couple of weeks to check it out. :)
 
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Possibly the mystery of bad gas. :) I think we get the worst crap for gas around here. And we pay more for it.:curse:
 

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Weather changes probably. The Cobb shouldn't hesitate in that range, mine pulls all the way to red. It had the usual lag at 3k rpm with the stock filter...
 
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All I know is that my car feels like it's got variable timing, with a switchover at around 3400rpms. It pulls pretty well until then, then it lunges and pulls hard from then to the fuel cutoff. Almost like turbo lag.
 

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13 Years of RS
2005 Toyota Corolla :(
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That little hesitation is normal with the 2.5, at least in 00-01 models. Maybe it has something to do with the MAP sensor? I don't know if the 98-99 have the same hesitation or not. It was there with the stock intake setup, and I have the GanzFlow w/ K&N drop-in filter, and it is still there, but it's not very noticable at WOT, but is noticable at partial throttle.
 
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