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07-16-2007, 01:12 AM | #1 |
Scooby Specialist
Member#: 68197
Join Date: Aug 2004
Chapter/Region:
South East
Location: south florida
Vehicle:2005 OBP WRX PPG + EJ257 |
Car dies when trying to idle / dying car
Just posted this over at enginuity.org, looking for more input...link: http://www.enginuity.org/viewtopic.php?p=21012#21012
Relevant mods: 850cc deatschwerks 3inch MAF 100***37; TIAL Atmospheric BOV (cannot be changed to re-circ) ACT Prolite flywheel 2.5 liter block to WRX heads Summary of problem: Once my car "catches" the idle, it idles fine. The problem is after it has been revved, or driven, it has trouble to idle. It has trouble "recovering" the idle For example, it could be idling fine at ~900rpm. I drive 1 block, come to a stop, the RPM needle will drop all the way to the way to 0 and car dies. If it doesnt die immediately, it will bounce between ~500-1300 RPM a couple times, then either settle at the 900-1000 rpm idle, or die if it dips below 500rpm. Observations: -It happens more frequently after a long highway cruise. -I am running rich because of MPG, smell, and backfires. -Before my 2.5 liter swap, which is also when I put in the ACT prolite flywheel, this only happened a couple of times, now its every time I drive the car, which makes me think its either the flywheel, or improper tuning adjustment to 2.5 liters. What I have tried: -raising idle speed with ecuexplorer -rescaling MAF and injectors Sorry for the uberlong post, just want to get anybody thats trying to help a clear picture. If anyone has any comments or suggestions please help. EDIT: Lol I just noticed that i unintentionally wrote my post in chem/physics Lab format, I guess thats what happens when taking 2 Labs for summer term B. Laughing Embarassed Laughing
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Last edited by VideoGameWrx; 07-16-2007 at 04:07 PM. |
07-16-2007, 07:21 AM | #2 |
Scooby Specialist
Member#: 47145
Join Date: Nov 2003
Chapter/Region:
MWSOC
Location: Henderson, KY
Vehicle:2012 Gas Saver |
you have the wrong spring in the TiAL BOV....
I had one customer changed it out to another brand after putting in the correct spring & it idled/recovered idle even better. |
07-16-2007, 08:30 AM | #3 |
Scooby Specialist
Member#: 68197
Join Date: Aug 2004
Chapter/Region:
South East
Location: south florida
Vehicle:2005 OBP WRX PPG + EJ257 |
thanks for the input, do u know what spring he used?
I found this http://cgi.ebay.com/ebaymotors/TIAL-...spagenameZWDVW My boost gauge reads about -0.65 bar at idle...should I be looking at the -9 psi? Last edited by VideoGameWrx; 07-16-2007 at 08:40 AM. |
07-16-2007, 08:55 AM | #4 | |
Scooby Specialist
Member#: 47145
Join Date: Nov 2003
Chapter/Region:
MWSOC
Location: Henderson, KY
Vehicle:2012 Gas Saver |
Quote:
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07-16-2007, 09:44 AM | #5 |
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Member#: 108872
Join Date: Mar 2006
Location: Philadelphia, PA
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I have a similar problem. My car idles fine, but sometimes when slowing to a stop the idle dips below 500 rpm and stalls. I think it's from the lightweight flywheel. It only happens once in a while but has been constant through 3 engines and even different ecu's (2.5 N/A, 2.0 wrx, 2.5 STI hybrid).
I have a stock BOV so that's not the issue. If anyone knows a fix through enginuity for the stalling i would be very interested to know. |
07-16-2007, 12:32 PM | #6 |
Scooby Specialist
Member#: 68197
Join Date: Aug 2004
Chapter/Region:
South East
Location: south florida
Vehicle:2005 OBP WRX PPG + EJ257 |
What flywheel are using? Mine is the ACT prolite which I think is only like 10lbs. So if this happens to you, and you have the stock bpv, that makes me wonder if its actually my spring. It could be the combination of both, does anyone know if a light flywheel can cause this?
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07-16-2007, 01:17 PM | #7 |
RIP 10/12/83 to 02/10/08
Scooby Specialist Member#: 83254
Join Date: Mar 2005
Chapter/Region:
NWIC
Location: Roy, Washington
Vehicle:98 2.5 RS 04 WRX |
It could be the TIAL, since you make more vacuum as the rpms are coming down than if you were just at a sitting idle. Also, it could be the MAF calibration. You usually only get to the very low end of the MAF scale when decelerating or when RPMs are coming down. It is a hard area to tune as well since you don't have much resolution especially with a big maf.
I'd put my money on the MAF calibration though as that is what I tweak to fix stalling issues on BigMAF or blow-thru cars. |
01-11-2008, 01:49 AM | #8 |
Scooby Newbie
Member#: 33509
Join Date: Mar 2003
Location: San Diego, CA
Vehicle:2002 chula vista NY plates |
I have the same exact problem after I installed my ACT ProLite. I also installed my ACT Street Clutch at the same time. I'm glad i read this thread. Sounds like it's the flywheel's fault. What did you do to fix the problem?
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01-14-2008, 12:25 PM | #9 |
Scooby Specialist
Member#: 95492
Join Date: Sep 2005
Chapter/Region:
MWSOC
Location: Waterford, MI
Vehicle:2003 WRX with STI goodies >:) |
I have the same problem as well except i have an ATS twin disc clutch. I am not sure the weight but it sure did feel heavy.
Bump for more info. |
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