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Old 08-11-2010, 01:23 PM   #1
kaisersouse
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Member#: 85900
Join Date: Apr 2005
Chapter/Region: NESIC
Location: Maine
Vehicle:
2001 Forester S
White

Default Exhaust popping at 4.5k, absolutely no rev over 5k. WTF

As stated, once I approach 4.5k revs the exhaust starts making popping noises, the car stops accelerating w/ each pop. Once revs hit 5k it start popping w/ machine gun rapidness, pretty much no power at that point..keeping it there results in a HUGE boom out the tail pipe.

Otherwise...car runs fine.

It does this both parked/neutral and under load. Does it from the moment I start driving till I turn the car off.

I've changed the plugs, checked the wires, cleaned the intake track, made sure all applicable sensors were connected etc, reset the ECU (its not throwing codes for this tho).

It just started doing this out of the blue, and has been doing it for a week or so now. The day before it started everything was great, the next morning....yeah it starts this crap.

Haven't had cats for a year+ now (they clogged, I gutted them) and I haven't backed the rear 02 sensor out. I was going to do that anyways...but i don't think it will help whats going on now.

What should I look at? I have OpenECU and even tho my ECU is too old for it to read codes...I can still do data logging. What should I be looking for in regards to "odd" values when I'm revving the motor w/ laptop attached?

any tips would help. Thank you!

Last edited by kaisersouse; 08-11-2010 at 01:47 PM.
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Old 08-11-2010, 01:32 PM   #2
kaisersouse
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Default

Oh and after doing some further Googling....my speedo is reading the correct speed. I read that if there was a problem w/ the ECU reading the vehicles speed it will restrict the car from going much over 4500 rpm.

I did recently change a faulty TPS w/ a used one from a donor car. Its not shifting horribly like it did when the original TPS went bad...but maybe I should investigate that as well?
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Old 08-11-2010, 02:06 PM   #3
Dr. octagon
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Quote:
Originally Posted by kaisersouse View Post
Oh and after doing some further Googling....my speedo is reading the correct speed. I read that if there was a problem w/ the ECU reading the vehicles speed it will restrict the car from going much over 4500 rpm.

I did recently change a faulty TPS w/ a used one from a donor car. Its not shifting horribly like it did when the original TPS went bad...but maybe I should investigate that as well?



^^^^^^
Yes, unless you have launch control or anti lag under all driving conditions.
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Old 08-11-2010, 02:11 PM   #4
kaisersouse
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Its a 99 OBS w/ a 96 motor....so im fairly certain I dont have any of that fancy-pants stuff

I'll check the TPS. That something I can verify w/ openecu or should i just manually adjust it and see if things get better/worse?
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Old 08-11-2010, 03:37 PM   #5
kaisersouse
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Also checking the EGR valve, cam position sensor and might pop that rear o2 sensor out and let if swing in the breeze jsut to see if things get better/worse.
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Old 08-25-2010, 11:45 AM   #6
kaisersouse
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2001 Forester S
White

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Not the TPS or EGR or cam/crank sensors.

http://madoshi.net/99imprezalog.png

*sigh*
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