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05-22-2023, 01:11 PM | #1 |
Scooby Specialist
Member#: 221364
Join Date: Aug 2009
Chapter/Region:
MAIC
Location: Baltimore
Vehicle:2002 Wrx EJ207 Ver 8 Wrb Dccd jdm 6 speed now! |
Ej207 cold start
I have an 02 wrx with a ej207 swap Version 8 engine and trans. Anyway when it first starts the boost gauge flutters like crazy . If I attempt to drive right away it feels like it has no power and will barely go 20mph. After a few mins of warmup it drives normally but still has the boost gauge flutter. I have changed almost all of the pcv hoses . My car does have a ver1 Crawford AOS, with the pcv valve removed and blocked off per the instructions. What could cause this
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Last edited by 666stars; 05-22-2023 at 02:46 PM. |
05-22-2023, 11:05 PM | #2 |
Scooby Specialist
Member#: 110078
Join Date: Mar 2006
Location: Long Island N.Y.
Vehicle:02 Bugeye JDM STi OBP BLACK |
I let my single avcs engines idle 3 minutes before I take off but cold idle cycle is smooth and normal. My ver 7 STi engine started to cold idle rough and turns out compression is low on cylinder 4. Possibly a leaking exhaust valve is what was diagnosed in my case.
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05-23-2023, 05:41 AM | #3 |
Scooby Specialist
Member#: 221364
Join Date: Aug 2009
Chapter/Region:
MAIC
Location: Baltimore
Vehicle:2002 Wrx EJ207 Ver 8 Wrb Dccd jdm 6 speed now! |
That’s what I was afraid of. Leak down test time
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05-23-2023, 08:36 AM | #4 |
Scooby Specialist
Member#: 283429
Join Date: May 2011
Chapter/Region:
South East
Location: Down yonder.
Vehicle:2016 Fuji Sunfire 03 Silver |
That could indicate a stuck/tight valve, or burnt valve.
A boost gauge is nothing more than a vacuum gauge that also reads positive pressure. One of the most overlooked diagnostic tools (and essential for us folks that grew up tuning engines with carburetors) is a vacuum gauge. Here's a chart to help you. |
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