What's your A/F on Overrun?, 'Nother D-Jet A/F Question |
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What's your A/F on Overrun?, 'Nother D-Jet A/F Question |
BeatNavy |
Mar 12 2017, 12:28 PM
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#1
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Certified Professional Scapegoat Group: Members Posts: 2,924 Joined: 26-February 14 From: Easton, MD Member No.: 17,042 Region Association: MidAtlantic Region |
For those with D-Jet, what are you typically seeing for A/F ratio on a medium to hard overrun? Based on what I've read here mine seems too rich - like in 10's and 11's. Once the RPM's drop closer to idle it bounces back up to normal idle A/F ratios. Does A/F on overrun even matter?
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mgphoto |
Aug 17 2017, 07:19 PM
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#2
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"If there is a mistake it will find me" Group: Members Posts: 1,339 Joined: 1-April 09 From: Los Angeles, CA Member No.: 10,225 Region Association: Southern California |
According to Porsche/VW the fuel cut off caused the cylinder walls to get hot, no fuel cooling, when the fuel returned there were atomization problems causing the hydrocarbon count to go up, not good for the environment and counter to what VW was trying to accomplish with FI.
Back to the OP, I think you may have a problem with leaky fuel injectors, overrun is the highest vacuum, that could cause fuel to be pulled from the injectors causing rich numbers on overrun, as mentioned this will not hurt your motor at all but your fuel economy will decrease. Check the condition of your spark plugs, color will tell you a lot. |
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