Flashing "Service Engine Soon Light" when under hard acceleration
#1
Member
Posts like a V-Tak
Thread Starter
Join Date: Oct 2007
Posts: 47
Likes: 0
Received 0 Likes
on
0 Posts
![Hesk000 is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
Just today I was driving my car when having to pass someone to get on the interstate I had to punch my SSEi pretty hard. I've had to do this many times and for the first time today when doing this the car started to putter or misfire. At the same time my Service Engine Soon Light blinked until I let off of the accelerator and then it stopped. Any ideas on what this might be?
#4
Senior Member
![](/images/badges/Gearhead.png)
True Car Nut
#6
Senior Member
![](/images/badges/Gearhead.png)
True Car Nut
![Default](https://www.gmforum.com/images/icons/icon1.gif)
Same with mine, except on cylinder #5. I was able to determine it wasn't firing by using a mechanic'* stethoscope. Plugs, wires, coils, then injectors ... that'* the order in which I would try to diagnose a misfire.
#7
Member
Posts like a V-Tak
Thread Starter
Join Date: Oct 2007
Posts: 47
Likes: 0
Received 0 Likes
on
0 Posts
![Hesk000 is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
Thanks guys. I actually just changed my spark plugs and it ran fine for about 3 days and then this started happening. I'm probably asking a stupid question now, but based on the recommendation of checking the plugs/coils/cables, what could I have done that would cause this? I was always under the impression if I possibly over cranked a plug and cracked the porcelain that I would be hearing a loud pop when I'm driving, which I am not. Also, I put in the GM recommeded plugs, AC Delco, however I did not change the wires, just the plugs.
Last edited by Hesk000; 10-22-2009 at 11:19 AM.
#8
Senior Member
![](/images/badges/Gearhead.png)
True Car Nut
![Default](https://www.gmforum.com/images/icons/icon1.gif)
There is always the possibility of a bad plug, but I would look at the wires. When were they last changed? Check wires and coils. Instructions are in this thread:
https://www.gmforum.com/t278818/
https://www.gmforum.com/t278818/
#9
Retired Senior Admin
![](/images/badges/Gearhead.png)
Expert Gearhead
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Likes: 0
Received 29 Likes
on
25 Posts
![Danthurs is a name known to all](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Danthurs is a name known to all](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Danthurs is a name known to all](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Danthurs is a name known to all](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Danthurs is a name known to all](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Danthurs is a name known to all](https://www.gmforum.com/images/reputation/reputation_highpos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
It'* always possible you have a bad plug out of the box. Another possibility is do you have screw on tips on the plugs? Some times these get loose and cause a misfire.
#10
Senior Member
Posts like a Northstar
Join Date: Apr 2009
Location: Indianapolis, Indiana
Posts: 699
Likes: 0
Received 0 Likes
on
0 Posts
![Nobotada84 is on a distinguished road](https://www.gmforum.com/images/reputation/reputation_pos.gif)
![Default](https://www.gmforum.com/images/icons/icon1.gif)
"Clogged catalyst, if plugs/wires/coils don't fix it. I'd bet my left nut on it."
LOLOL!!! Im a little disturbed wit how quickly this cat offered up his left nut.LOLOLOL!!! Hilarious bro!
LOLOL!!! Im a little disturbed wit how quickly this cat offered up his left nut.LOLOLOL!!! Hilarious bro!