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RPM rises 400 when doing 3 to 4 shift [MERGE]

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Old Apr 4, 2004 | 11:40 AM
  #16  
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it sounds like the clutch is going
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Old Apr 4, 2004 | 11:50 AM
  #17  
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If you have a blow off valve, that may be causing a problem.
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Old Apr 4, 2004 | 12:21 PM
  #18  
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If you have an aftermarket BOV and it occurs just as you lift off the throttle to shift it could be compressor surge.

Speedlimit...
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Old Apr 4, 2004 | 07:00 PM
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Sounds to me like BOV problems as well.

shiv
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Old Apr 4, 2004 | 07:23 PM
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shiv, I'm glad you found this thread.

I initially thought it was my forge d/v, which is a d/v not a vta model. I took it out, checked everything, re-lubed it, put it back in. No change. I still get this but it's noticeably more often whenever it's colder outside, say < 40 degrees.

If you check my thread link above you'll see a few other suggestions. I haven't explored them yet myself. I don't see how it could be the d/v since it's such a simple device and has worked flawlessly since I got it. I mean if the d/v weren't releasing the pressure 100% like it should, that would simply cause surge. I don't know how it could affect the engine's fuel consumption/rpm level. Can you explain that a bit further? I may just be missing something. Thanks.
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Old Apr 4, 2004 | 07:31 PM
  #21  
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Originally posted by webguy330i
shiv, I'm glad you found this thread.

I initially thought it was my forge d/v, which is a d/v not a vta model. I took it out, checked everything, re-lubed it, put it back in. No change. I still get this but it's noticeably more often whenever it's colder outside, say < 40 degrees.

If you check my thread link above you'll see a few other suggestions. I haven't explored them yet myself. I don't see how it could be the d/v since it's such a simple device and has worked flawlessly since I got it. I mean if the d/v weren't releasing the pressure 100% like it should, that would simply cause surge. I don't know how it could affect the engine's fuel consumption/rpm level. Can you explain that a bit further? I may just be missing something. Thanks.
This is going to sound stupid but flip the BOV the other way around. Even if it is currently configurated "correctly". I've seen some applications where Forge BOVs work better when used backwards. No, I'm not kidding

shiv
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Old Apr 4, 2004 | 07:34 PM
  #22  
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Actually I'm already running it backwards from the stock orientation. I changed it back when I had fluttering issues, and it seems to work a slight bit better but most of my flutter problems have ceased to exist now that I have proper pedal modulation skills while on the highway.

Any other suggestions? This is secondary to me right now, top problem is currently the SES p0300 error. argggggg!
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Old Apr 5, 2004 | 07:40 AM
  #23  
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I have the stock BOV on my car but had a forge recirculating that did the same thing.

I also have stock clutch but plan to get the clutch master stage 3 soon.

Last edited by snoop; Apr 5, 2004 at 07:45 AM.
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Old Apr 5, 2004 | 08:21 AM
  #24  
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I have the exact same BOV and same problem as you... Let me know if you find anything out.

I find that also when it's cold, it happens more, like you. However, after it warms up (the car or the weather) it doesn't happen nearly as often.
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Old Apr 5, 2004 | 08:22 AM
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Fireball, precisely. Have you talked with timzcat about it at all? He suggested carb cleaner in the TB.
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Old Apr 5, 2004 | 08:37 AM
  #26  
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That doesn't sound right... it's not like my throttle is sticking at all... sounds more along the lines of the compressor surge, like someone mentioned.

Have you tried it yet?
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Old Apr 5, 2004 | 08:46 AM
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Originally posted by webguy330i
Fireball, precisely. Have you talked with timzcat about it at all? He suggested carb cleaner in the TB.

This thread is starting to remind me of the AFLAK (sp?) duck . It sound just like compressor surge . You should try and adjust your BOV spring pressure or replace it (the BOV). It is a common problem with some aftermarket BOVs.

Speedlimit...
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Old Apr 5, 2004 | 09:15 AM
  #28  
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Originally posted by Speedlimit

You should try and adjust your BOV spring pressure or replace it (the BOV). It is a common problem with some aftermarket BOVs.
Speedlimit...
The problem occurs on a stock BOV and FORGE recurculating
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Old Apr 5, 2004 | 09:58 AM
  #29  
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Yes I have eliminated my d/v from the equation already, but thanks for the suggestion.
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Old Apr 5, 2004 | 10:08 AM
  #30  
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From: NR Reading PA
Originally posted by snoop


The problem occurs on a stock BOV and FORGE recurculating
If your throttle body valve is not sticking when in gear (take your foot off gas and if rpm drops immedietly) then I would still assume it is compressor surge caused by delayed relief and or insufficient flow rate of your bypass valve. Do you have a boost gauge?

Speedlimit...
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