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Registered
Join Date: Mar 2004
Location: Republic of Texas
Posts: 2,674
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Wits end with misfire
Just did a valve job on an 09 r55 and the problems just dont seem to end. The thermostat developed a crack, and throttle body was returning a code for weak return spring. I seem to have these issues sorted out but I have a persistent misfire on #4. I have eliminated the coil, plug and injector as a possibility. Compression seems to be in line with the others. When cold its fine, but as it nears operating temperature is starts to misfire and gets worse as the temperature increases. This only happens at idle. I'm using Bavarian Tech diagnostics and it appears the spark plug firing time is dropping out whenever it misfires. Has anybody ever seen anything like this before? Is there anything else I can test?
PS: checked compression and now the misfire has moved to #1
__________________
james www.gruppe9autowerks.com Its not how fast you go...its how you go fast |
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01-18-2020, 05:42 PM
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Registered
Join Date: Mar 2004
Location: Republic of Texas
Posts: 2,674
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Nobody has a clue?
__________________
james www.gruppe9autowerks.com Its not how fast you go...its how you go fast |
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02-05-2020, 10:24 AM
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