I had my festiva out for a test run the other day and I noticed that if i floor it and let it come up to red-line, the entire way through the power band, the engine output is in waves, like, if you were to compare it to a chart, the thrust would look like a sign wave with 3 humps, I don't know how else to explain this, um like........waaAAAaaaAAAaaaAAAAAA. weird eh? thoughts?
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mine and my budies does the same thing i think it just has a wavy power band
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Mine does it, kicks in at about 2500 rpms, kicks in again at about 4300.www.dantheoilman.com
AMSOIL dealer and window tinter.
Trust me folks, you need www.auto-rx.com
Go ahead and ask me why
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Every now and then mine will do it on a hot restart ,seem sluggish ,and feel like it pulls hard then not so then hard again , like you said wavy,on a fast scale ,it usually does it a few times then quits after a few blocks .
It does not do it all the time , I have never worried about it , I have always blamed it on poor quality fuel .------------------------------------------------
The Trigger - Midwest Festiva Inc., Illinois Chapter
Smart Passion white with H-D interior
HD2500 Duramax Chevy
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Pro Street S-10 http://www.cardomain.com/ride/2214968
Diamond white Deville 27,000 mile cream puff
Z28 LS1 power 500 +
90 Festy L daily driver wants to be modded, OK
It is being modded , a little at a time http://www.cardomain.com/ride/2214953
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Perhaps the shudder inside the mass air flow box is sticking from age and as the engine draws more and more air throughout its power band, instead of the shudder fluently moving open according to air demand, it is sticking and un-sticking as the engine goes through its power band. Any thoughts on this theory guys?
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just before it went out it was running nicely then all of a sudden it started reving up at like 4500 rpms ideling i replaced the throtal positioning sensor cost 60 bucks but this did not help. at all it jsut high reving really bad still with this new part any body got any suggestions on this
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Have you checked to see if there is something caught in your throttle plate , like a chunk of build up or a foriegn object , holding the plate open .------------------------------------------------
The Trigger - Midwest Festiva Inc., Illinois Chapter
Smart Passion white with H-D interior
HD2500 Duramax Chevy
Harley Davidson Ultra classic ..I am in love !!
Pro Street S-10 http://www.cardomain.com/ride/2214968
Diamond white Deville 27,000 mile cream puff
Z28 LS1 power 500 +
90 Festy L daily driver wants to be modded, OK
It is being modded , a little at a time http://www.cardomain.com/ride/2214953
Join me on Facebook !! ;http://www.facebook.com/profile.php?...00000295094896
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Ive been in about 4 festivas and 2 aspires, they all do this. I believe reason for is that there is basically a defined preset fuel map, and what you are feeling is the fuel map changing through the rpm's. I wouldnt worry about it, i think it is normal. My 97 does this as well. I would almost put my money on the ecu fuel map.
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Not 4,500 RPM's at a idle .------------------------------------------------
The Trigger - Midwest Festiva Inc., Illinois Chapter
Smart Passion white with H-D interior
HD2500 Duramax Chevy
Harley Davidson Ultra classic ..I am in love !!
Pro Street S-10 http://www.cardomain.com/ride/2214968
Diamond white Deville 27,000 mile cream puff
Z28 LS1 power 500 +
90 Festy L daily driver wants to be modded, OK
It is being modded , a little at a time http://www.cardomain.com/ride/2214953
Join me on Facebook !! ;http://www.facebook.com/profile.php?...00000295094896
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it happens with carbed engines as well... it's how the intake and exhaust are tuned that causes this phenom. for the FI engines i suspect the intake side is felt first and then the exhaust at higher rpms. when i had my stock B3 carb setup with stock exhaust, i used to feel a slight kick at 3800 and then it would fall on it's face, this due to both short intake runners and exhaust manifold. when i switched to the long tube headers, i started getting 2 humps of power, once at around 2500 and then again just after 4000.
for you FI guys, it's just the opposite... long intake runners and short exhaust, but the same principals apply.Trees aren't kind to me...
currently: 2 88Ls (Scrappy and Jersey), 88LX, 90L(Pepe), 91L, 91GL (Skippy) 93 GL Sport (the Mighty Favakk), 94 (Bruce) & 95 Aspire SEs, 97 Aspire (The Joker),
94 Justy 4WD, 87 Fiero GT, plus 2 parts cars. That's my fleet.
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