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smurfbus smurfbus is offline
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Join Date: Aug 2009
Location: Europe
Posts: 1,423
AFR jumps to rich on light cruise?

This just happened to me and it's the first time. also the rpms on idle jumped to 1200 from 800. AFR jumped from 14.7 to around 13 and idle from 14 to 12?

My thoughts for the reason are.

1. Some hose started to leak or unplugged
2. Cold start injector leak
3. My supposedly defective front pump started to function

What else could it be?

Wur is warm so I don't think it can go to cold start control pressure unless elec problem so
4. Wur does not get power and goes to cold control pressure

When I started it again after 30min the rpms were even higher at 1600 rpm and still very rich overall. Turning the rpm screw all the way closed did not help so there must be a leak after the throttle body, right? Are there any vacuum connections there?

I had to dial the warm control pressure and idle CO leaner and now it seems fine except high idle.

Very odd situation.

Last edited by smurfbus; 06-19-2010 at 03:04 AM.. Reason: more info
Old 06-19-2010, 12:55 AM
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