flashing ses light but no codes??

**VENOMOUS** · 12-09-2008, 12:46 PM

Okay I am getting the occasional flashing ses light but have no codes to refer to.( p300,302,303 etc.) I have checked all the threads and found no solution. Changed plugs, wires, o2s cleaned MAF, NO luck. Please help!

**BlueMagicSS** · 12-09-2008, 09:30 PM

A flashing SES or MIL light indicates you have a catalyst damaging malfunction in your engine. It could be a misfire or a rich running condition. If you have cats your best bet would be to shut the car off and get it to a shop ASAP. what mods do you have done or what did you do right before this problem started occurring?

**VENOMOUS** · 12-10-2008, 06:12 AM

Originally Posted by BlueMagic08

A flashing SES or MIL light indicates you have a catalyst damaging malfunction in your engine. It could be a misfire or a rich running condition. If you have cats your best bet would be to shut the car off and get it to a shop ASAP. what mods do you have done or what did you do right before this problem started occurring?

I understand what the light means after searching days of threads, but can't get a code to find out what might be the culprit. It's a daily driver for the most part and NOTHING was done prior to the flashing SES. I had noticed it got richer and richer over the past few months to the point of about 14 mpg when I could squeeze 20 -22 from her. Changed plugs, O2s , checked all wires and extensions, switched to the Corvette rears O2s, cleaned MAF, checked plug wires ( OHMs). Everything I could think of and was recommended by the members here and LS1TECH. Even replaced header gaskets with same results?

Any other help is appreciated.
No I don't have cats and am running an factory 346,tr230 rev. split, Hooker 1 7/8LT and catback with dump, UD pulley,MSDs, TR55@.055, 918 springs.

**Sarge91** · 12-10-2008, 08:17 AM

Did you get the Cats error code deleted?

**VENOMOUS** · 12-10-2008, 08:48 AM

Originally Posted by Sarge91

Did you get the Cats error code deleted?

From what I understand Yes. But after looking at a freeze frame I do show stft and ltft form 3&4 which I thought were post cat O2s?

**BlueMagicSS** · 12-10-2008, 10:01 AM

So it's adding fuel.... that's interesting.... I was gonna say check the injectors for a leaky one until you said that..... but now I'm kinda at a loss.... That's real odd....

**mrr23** · 12-14-2008, 05:51 AM

a flashing SES light means there is a misfire. plug, wire, coil.

**BlueMagicSS** · 12-14-2008, 08:25 PM

It just occured to me... did you check the history and maturing codes or just the current codes?? Also if you have a scanner you may want to let the car run for a few while checking the data and see if you see anything irregular

**Frost** · 12-15-2008, 05:56 AM

Originally Posted by VENOMOUS

From what I understand Yes. But after looking at a freeze frame I do show stft and ltft form 3&4 which I thought were post cat O2s?

There is no 3&4. There is B1S1, B1S2, B2S1, and B2S2. The rear O2s (both S2's) have no effect on fueling.

Originally Posted by mrr23

a flashing SES light means there is a misfire. plug, wire, coil.

Agreed.

If it smells rich and you are losing MPG, the misfire is real. The fresh (unburned) air from the misfiring cylinder appears as a lean condition to your narrowband O2's which causes the car to [incorrectly] compensate by pouring in a ton of extra fuel in an attempt to 'make up' for a lean spot that isn't a lean spot at all...

**mrr23** · 12-15-2008, 11:07 AM

i think he meant the 3 & 4 being the % for the stft and ltft. so, it's adding fuel. being +/-4 is really good.

**VENOMOUS** · 12-15-2008, 01:40 PM

Originally Posted by mrr23

i think he meant the 3 & 4 being the % for the stft and ltft. so, it's adding fuel. being +/-4 is really good.

On the scanner I looked at the fuel trims and it showed stft and ltft for 1-4 and stft 3,ltft 3, stft4 and ltft 4 were in the + 50's and 60's?

**Frost** · 12-15-2008, 07:25 PM

+50-60 is maxed out; thats a hard and steady misfire.

**VENOMOUS** · 12-16-2008, 07:02 AM

Originally Posted by Frost

+50-60 is maxed out; thats a hard and steady misfire.

Injectors or wires left. I've changed everything else. MSD wires are about 30K old but looked over them and saw no flaws. Ohmed 4 and got 22-23 ohms? I'm starting to think injector. I swapped complete coil pack bracket off of known good car and no change? ANy ideas?