• Hi Guest, welcome to TCG 2.0. Please refer to the FAQ in User Support before you do anything else. It will make the transition MUCH easier.

    IF YOU ARE SEEING AN "OOPS" ERROR PAGE, IT IS LIKELY BECAUSE YOUR BROWSER HAS NOT UPDATED YOUR CACHE. YOU CAN EITHER CLICK FORUMS AT THE TOP LEFT OR VISIT THECHICAGOGARAGE.COM AND BOOKMARK THAT. - Love, Mook

Misfire and ticking noise.

Joined
Aug 1, 2007
Messages
1,811
Reaction score
0
Location
Berkeley, IL
03 Regal GS L67. mods in sig. car has 115k on it now

I was driving it tonight and when i pulled up in front of my friends house and was waiting for him, i noticed that beteween 1200-1500 rpm the car felt like it was misfiring slightly. when he got in the car he said it didnt sound good, so i rolled down the window and sure enough the engine is ticking at idle/any rpm.

Any throttle above 25% causes one hell of a misfire and the SES light starts flashing.

im thinking either a loose rocker arm bolt, blown lifter or something similar. this is definately not a rod knock sound. sounds valvetrain related.

any ideas guys?
 

Eagle

Nemo me impune lacessit
Super Moderator
Joined
Mar 1, 2008
Messages
62,545
Reaction score
19
Location
Woodsticks, IL
Sounds like you need to get in there and check for any mechanical issues first.

If the SES is blinking, it means you're having multiple misfires @ the same time so I'm guessing more than just one cyl is having problems. Pull the codes and see what they might tell you.

I don't have sigs turned on so I can't really see the mods you have.... too lazy today to turn them on to read.
 

Turbocharged400sbc

Welllllllllll ya knowwwwwww.....
Joined
Jun 16, 2007
Messages
26,499
Reaction score
12
Location
hangover park IL
if you did any work to it recently the oem wires may have broken internally and you may only now be feeling it as the candle (spark across the break) burns outward from the middle

to isolate it take a timing light and determine if the noise is valvetrain speed at the same time it might tell you which cylinder is missfiring (feel for the stumble/strobe to sync as you move the wire sensor from cyl to cyl.)

i'm betting the tick may be exhaust related (DP flex?)

grab a 3-4ft length of rubber hose (and beat yourself with it) then listen around for the leak/noise location
 
Joined
Aug 1, 2007
Messages
1,811
Reaction score
0
Location
Berkeley, IL
Found the problem.

Defective spark plug. the porcelain/electrode seperated from the metal threaded part and was just flopping around causing all kinds of hell.

ill never use autolite plugs again. back to ngk it is.
 

Turbocharged400sbc

Welllllllllll ya knowwwwwww.....
Joined
Jun 16, 2007
Messages
26,499
Reaction score
12
Location
hangover park IL
its an OE problem.....operator error, like i said it likely could have been fractured when it was initially gapped

you just dont know your own strength lol
 

Create an account or login to comment

You must be a member in order to leave a comment

Create account

Create an account on our community. It's easy!

Log in

Already have an account? Log in here.

Top Bottom