Removed the Cold Start Valve now its rich?
Thread Starter
Pro
Joined: Dec 2002
Posts: 522
Likes: 3
From: Rolling Meadows IL
Removed the Cold Start Valve now its rich?
I suspected my Cold Start valve was leaking ( hard hot starting) so I got rid of it. I disconnected the valve, plugged the fuel rail, modified the Crank Fuel Pulse Width vs Coolant Temp table. Starts great and no gas leaks.
Now the problem. At WOT I went from ~12.5% A/F ratio to about 11.5% A/F on my WB02. If anything I thought I would have been leaner not richer. My O2 sensor is on the driver side header collector if that matters. Any clue why it got richer.
Now the problem. At WOT I went from ~12.5% A/F ratio to about 11.5% A/F on my WB02. If anything I thought I would have been leaner not richer. My O2 sensor is on the driver side header collector if that matters. Any clue why it got richer.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
No, the 02 doesn't matter since at WOT it's feedback is ignored.
I suspect it has to do with the PROM programming you did. The cold start injector only fires during cold cranking.
Are you sure you modified the correct table?
Jake
I suspect it has to do with the PROM programming you did. The cold start injector only fires during cold cranking.
Are you sure you modified the correct table?
Jake
