Mysterous flashing check engine light

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Jul 10, 2005 | 03:04 PM

Phil99vette

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From: Port Tobacco, MD

Mysterous flashing check engine light

I have a car that we're touching up the tune on and from time to time the check engine light flashes. Its a stock bottom end + magnacharger + alky. When your driving under very light load/cruising, the check engine light will flash about 6-10 times. If you quickly go to the code portion of the DIC there is no set code and I had a scanner on it and didnt throw a code there either. Any ideas?
Phil

Jul 10, 2005 | 03:06 PM

HumpinSS

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From: Waldorf, MD

Usually that is indicative of multiple misfires...

Jul 10, 2005 | 03:40 PM

CAT3

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From: Sierra Vista, AZ

Agree, if there is a misfire, you get the flashing SES, and if the SES doesnt set a DTC then either the limits are off, or otherwise not setting. Interesting enough, I also have a car I am working on, we put in the new CheaTR cam, and around 4500-6000 randomly, the SES will flash, after enuogh times it finally set with Misfire, but was immature, so cleared the log, and scanned again, no more issues after the next few runs.
Good luck with it Phil and post up, or pm me your findings please.

Jul 10, 2005 | 06:32 PM

Phil99vette

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Man, this is a weird problem. I was driving home from my mothers house and doing about 30 with the rpms relatively low <2k and throttle < 20% the CE light starts blinking. Scanner shows nothing...
Phil

Jul 10, 2005 | 08:10 PM

NicD

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From: Chandler, AZ

Disable the misfire test completely. On a lot of larger cammed cars I have seen you cannot just loosen the test up by filling all the misfire tables with 32767.

Jul 10, 2005 | 11:59 PM

TXCAMSS

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From: On the Bumper!

Phil I had the same problem after the install of my 244/612 cam. I just had to fill in the misfire tables with 32767 at the effected rpms. I had the idle rpm tables set already, but i had modif the lower cruise tables as well and now it's doing great. I left the mid/uppers as a back up for a real misfire issue. Mine would flash when I was cruising with light throttle or when I accelerated softly from an intersection. If it flashed , I could blip the throttle and it would clear temporarily. This indicated a designated rpm/load range false misfire.

I hope this helps. It is wierd since there is no code stored. Good luck!