MyMonte.com - A 1995 to 2007 Chevy Monte Carlo Community: Cylinder 6 Misfire - MyMonte.com - A 1995 to 2007 Chevy Monte Carlo Community

Page 1 of 1

You cannot start a new topic
You cannot reply to this topic

Cylinder 6 Misfire after header install Rate Topic:

#1 cak387

Wankerizer 4000

Group: Members
Posts: 1,261
Joined: 16-March 06

Posted 19 March 2010 - 12:57 PM

Just got the car back from the shop today after the headers were installed. Everything looks good, but the car isn't running the greatest. I keep getting a cylinder 6 misfire code popping up. Also, while I'm driving, the SES light will flash under heavier to full throttle.

Symptoms include sluggish off the line under heavy/full throttle, rpm's bounce up and down by 200 right around 2500 rpm's, SES light flashes under harder acceleration and full throttle. That is all that I can think of now.

I did just put new plugs on (AL104's) and new wires during the header install. After I get off I will be pulling the #6 plug out to see how it looks. Other than the problems mentioned, cruising is just fine as long as the rpm's stay low. If I go WOT, it will be a little sluggish around the 2500 mark, but then seems to run fine on the top end.

I will be dynoing in the morning (hopefully) so I plan on getting the kinks out of it tonight.

Current- 2004 Intimidator SS L67 Sold- 1997 LS-Flowmaster Exhaust, 18" Enkei G Zeros w/ 225-35-ZR18 G-Force Sports
Performance: Headers, Pulley, Intake, Tune
Suspension: GMPP Full Suspension, Rome Brackets
Appearance: Roof Rails, HID Lows, HID Fogs, 60-60 SMT Switchbacks

#2 Dbl_D718

duh! to make room for the tuna

Group: Members
Posts: 467
Joined: 18-September 07

Posted 19 March 2010 - 01:19 PM

The SES light flashing is for the misfire, meaning it's missing bad enough to damage your cat if you still have one. Check the basics first, like plugs and wires. My car did just what you describe and it ended up being a bad plug wire.

Top Swap, Gen V 3.8", N* TB, XS Power Headers, ZZP Wires, AL 103s, 180* T-stat, Poly Upper Mounts

#3 jaybaum96

I pity da foo!

Group: Members
Posts: 1,207
Joined: 13-June 09

Posted 19 March 2010 - 01:20 PM

Maybe a plug is loose, check the connections. Worst case possible you may have gapped your number 6 plug too big...

96 Lumina LTZ Clone - L67/4T65HD SWAP ::SOLD!!!

1995 Nissan S14 240SX ::BROKEN & SOLD!!!

97 Pontiac Grand Prix GT Coupe :)

#4 ChibiBlackSheep

Mmmm Forbidden Doughnut

Group: Members
Posts: 1,060
Joined: 05-February 09

Posted 19 March 2010 - 01:23 PM

Try a different plug/wire on 6 and see if the misfire moves with it or if it is the coil pack.

2000 Monte Carlo SS | 180,000+ miles | Turbo in the Works
1998 Camaro BPM | 5-Speed | New Daily Driver

#5 me6894

I bleed Cheese Wiz

Group: Members
Posts: 6,528
Joined: 16-March 05

Posted 19 March 2010 - 01:31 PM

First stop driving your car if the engine light is flashing.

Did you look at cylinder 6 plug wire to make sure it isn't sitting up against the header melting it? Have you checked for spark?

mstrjon32, on Mar 4 2009, 08:38 AM, said:

L67 swap makes the panties drop.

#6 cak387

Wankerizer 4000

Group: Members
Posts: 1,261
Joined: 16-March 06

Posted 19 March 2010 - 02:45 PM

I don't have a cat to worry about now and all I have done is drove the car home. The plug wire doesn't look to be hitting the header. I will pull the plug when I get off at eight tonight. I will check the plug and wire then. I will test to see if the old wire will do anything different.

#7 cak387

Wankerizer 4000

Group: Members
Posts: 1,261
Joined: 16-March 06

Posted 19 March 2010 - 10:33 PM

Alright, well when I got home I switched out plug wires and still had the problem, and it was a little worse now at idle. I then changed out the #6 plug for a new AL104 and the car runs much better. The plug just must have been a bad plug because it was new as of Tuesday, along with the plug wires. I took it out and it looks fine but that was the culprit. Thanks for the help guys!