Help me out with a misfire pro

[slacker69]

I rebuilt and reinsalled the Upper Valvetrain Inc. Heads rockers, lifters, and new valve seals. And when i start her up for the first time. She has a Misfire and Flashing SeS light. I checked all plugs wires and replaced the plugs but its still there any help would be appreciated.

[Wicked 3800 V6]

You need a scan tool bro -- it will tell you which cylinder, and then you can specifically check the plug, wire, and coil on that cyl.

Got the wires on the right plugs? Got tons of knock? (but I doubt that would make it flash)

[RallyRed 98]

flashing SES means that your emissions are 1.5 times the acceptable level. be sure to check upstream of the plugs and wires too, like your coil packs, ICM, etc.

[Jerriko]

Originally posted by RallyRed 98:
flashing SES means that your emissions are 1.5 times the acceptable level. be sure to check upstream of the plugs and wires too, like your coil packs, ICM, etc.

A flashing SES light signifies a misfire. Misfires screw up emissions but not all causes of increased emissions are misfires.

[RallyRed 98]

good point, but i'm also right.

[ January 17, 2005, 08:20 AM: Message edited by: RallyRed 98 ]

[Den69RS96]

If your sure you have a misfire and dont' want to spend the extra coin on a scanner, buy a sparkplug tester and a ohm meter. Its basically a spark plug with clip welded onto it. Use the ohm meter to check the resistence in the wires. Make sure they fall within the specs listed in a service manual. Then check each spark plug wire with the spark plug tester. Have a budy crank over the engine and watch for a spark. If your not getting a spark on one cylinder, you narrowed it down to either the coil or the Ignition control module. I would switch locations with the non firing coil with one that works. If the same coil is bad in a different location than the coil is bad. If the non firing coil fires in a different location, then the ICM is bad. Good luck

[Seppo Kaitainen]

Sounds like a bad coil to me. But your initial focus should be plugs, wires, and coils...

[pgriffith]

Flashing SES is also a multiple misfire. If your misfiring on one cyl. it will be a solid light. If your missing on more then one cyl. it will flash.

[l1tech]

A flashing ses light means that you have a misfire so bad that it is going to damage the catalytic converter...and that's all it means. The ohm meter check on the plug wires only works if the cable is physically broken inside the insulation.