PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Strange fueling issues...........

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Old Jul 19, 2011 | 08:52 AM
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Default Strange fueling issues...........

Anyone else see unequal injector duty cycles when all trimming is disabled?(bottom left in the screen shots) This is an OLSD tune. Also noticed in the logs that my dynamic airflow values take random dips for no apparent reason while at constant RPM, MAP and IAT??



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Old Jul 19, 2011 | 12:55 PM
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Looks like my Roadrunner PCM is bad because replacing it with the factory PCM cleared this up.
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Old Jul 19, 2011 | 02:07 PM
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DrX,

That did look pretty odd...

glad you found the problem, please let me know how the RR gets repaired (what went wrong in it);

do you remember anything traumatic that happened to the RR...?
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Old Jul 19, 2011 | 03:00 PM
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Don't recall anything specific. The RR looks fine physically inside and out. Going to see if I can actually get this thing running properly now without it before sending it in. Still have some issues to sort out like WOT stutter and heat-soaked starts needing a ton of additional air to prevent a stall, but it seemed to cruise a lot smoother today even in the crazy heat.
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