PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

s.e.s light flashing.

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Old Apr 12, 2004 | 05:18 PM
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Default s.e.s light flashing.

guys, got my cam, headers, and exhaust put on last week +had it mustang dynoed, put on about 75 miles on the car since the mods where done and today while I was coming home sitting at the light, the s.e.s light was flashing ,but as soon as I took off it went away. didnt seem to run any different. any suggestions.
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Old Apr 12, 2004 | 05:26 PM
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missfires detection. even if p300 is off, if it detects too many misfires, the ses light will flash, just not throw a code.
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Old Apr 12, 2004 | 05:39 PM
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whats causing that to happen.?
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Old Apr 12, 2004 | 05:44 PM
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lots of things.

broken spark plug, bad wire, bad coilpack, bad connestion on the coil pack.

get someone with atap or efi live and find out wich cyl is missfireing.
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Old Apr 12, 2004 | 05:50 PM
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you need to desensitize the misfire system. esp if this is at low load/idle. The tuner disabled p0300 so it wont store the code.

if you wanna really trip out watch cyl 1-8 current misfire counts in efilive
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Old Apr 12, 2004 | 06:02 PM
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can they still tell even if the ses light is not flashing.?
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Old Apr 12, 2004 | 06:08 PM
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the engine will constantly missfire, thats how the pcm makes a ls1 run so smooth in stock form.
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Old Apr 12, 2004 | 06:11 PM
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Yellowbird, did you get your idle fixed? If not the offer still stands if you want to bring it by my shop. I would also be happy to look at this problem for you. Just give us a call and we can get you in.

Thanks
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Old Apr 14, 2004 | 01:19 PM
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Last time my SES light was flashing i had a crushed valve spring, but that one was obviously solved!
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