View Full Version : LAUNCH STUTTER,PLEASE HELP!!
JEFF69Z28
06-04-2009, 02:07 AM
CAR STUTTERS ON LAUNCH AND THEN CLEARS UP,DRIVING UP PIT ROAD I CAN HEAR A MISS,I HAVE A 6AL BOX WITH A BLASTER COIL AND A MSD 8555 DISTRIBUTOR.I HAD THE BOX CHECKED LAST YEAR AT A SPEED SHOP WITH MSD'S CHECKER AND IT SAID IT WAS OK. MY CAR WAS DOING THE SAME THING WITH THE OLD MOTOR AND CARB.GOT NEW CARB FOR NEW MOTOR FROM PRO SYSTEMS 2 PASSES AND NOW IT STUTTERS ON LAUNCH.
IM LOST!!
MY H2O PUMP,FUEL PUMP,ELECTRIC FAN AND STARTER ARE ALL ON THE SAME REDTOP OPTIMA BATTERY.
itsabird
06-04-2009, 02:53 AM
i would start by checking grounds, makeing sure they are good, look for shorts, check fuel system, fuel pressure, fuel line for kinks, good luck.
JEFF69Z28
06-04-2009, 02:58 AM
DO I NEED A GROUND STRAP FROM THE ENGINE BLOCK TO THE FRAME OR IS THE ONE FROM THE BODY TO MY ALUM.HEAD GOOD ENOUGH.
hammertime
06-04-2009, 04:11 AM
DO I NEED A GROUND STRAP FROM THE ENGINE BLOCK TO THE FRAME OR IS THE ONE FROM THE BODY TO MY ALUM.HEAD GOOD ENOUGH.
I run one to the frame also on each side, grounds are your friend on these things. You do have your coil/dist wires not running together correct ? Have you checked all you plug wires to make sure they are ok ?
JEFF69Z28
06-04-2009, 04:51 AM
WIRES ARE BRAND NEW ULTRA 40 FROM MOROSO,I USED THE OLD MSD COIL WIRE DID'NT HAVE TIME TO CUT TO LENGHT THE NEW ONE.
chevyfireball
06-05-2009, 05:31 AM
The coil wire is going to take a crap before any of the plug wires. Change it.
StrokersGraphics
06-19-2009, 09:59 PM
there are many things that could cause your car to fall on it's face and then clear up. i agree with what everyone has said but i must add, check on these items as well.
-fuel pressure?
-needle and seat clean?
-check your float level
-are you running power valves and if so has your car ever back fired thru the carb (must change power valves every time that happens)
It almost sounds like your carb is loading up on you when you leave the line.
bbchevy
06-20-2009, 02:01 PM
CAR STUTTERS ON LAUNCH AND THEN CLEARS UP,DRIVING UP PIT ROAD I CAN HEAR A MISS,I HAVE A 6AL BOX WITH A BLASTER COIL AND A MSD 8555 DISTRIBUTOR.I HAD THE BOX CHECKED LAST YEAR AT A SPEED SHOP WITH MSD'S CHECKER AND IT SAID IT WAS OK. MY CAR WAS DOING THE SAME THING WITH THE OLD MOTOR AND CARB.GOT NEW CARB FOR NEW MOTOR FROM PRO SYSTEMS 2 PASSES AND NOW IT STUTTERS ON LAUNCH.
IM LOST!!
MY H2O PUMP,FUEL PUMP,ELECTRIC FAN AND STARTER ARE ALL ON THE SAME REDTOP OPTIMA BATTERY.
I JUST went Through the Same PROBLEM???
It was the 6AL Box!
Changed the Box and the Miss,went with it........................?Go FIGURE?
Later
G
SpD85
11-24-2009, 04:26 PM
Ive had this problem before in 2 different dragsters....
In the 1st one it turned out to be a bad Two Step(dont ask me how)
The 2nd car i tried what i thought was everything and it ended just being that i need some bigger squirters :)
BEAST477
11-24-2009, 04:39 PM
Also if you can get the MSD tester and test with everything hooked up on your car. Then one by one turn on anything electrical you have on the car and see if it misses that way. I chased a similar problem for almost a year. Found it to be my 12 volt fan inside the car.
FullTimeRacing
11-24-2009, 05:34 PM
Ive had this problem before in 2 different dragsters....
In the 1st one it turned out to be a bad Two Step(dont ask me how)
The 2nd car i tried what i thought was everything and it ended just being that i need some bigger squirters :)
Here in the south the whether is just getting cold ,so I had to put more fuel in it to stop the stutter.
MEMRACING62
11-24-2009, 05:43 PM
DO I NEED A GROUND STRAP FROM THE ENGINE BLOCK TO THE FRAME OR IS THE ONE FROM THE BODY TO MY ALUM.HEAD GOOD ENOUGH.
I run one to the frame also on each side, grounds are your friend on these things. You do have your coil/dist wires not running together correct ? Have you checked all you plug wires to make sure they are ok ?before you do anything else correct your ground situation. if this is a unibody car with battery in the trunk run a ground from the battery to the block.
altune
12-11-2009, 05:48 PM
Is ths car stuttering riht off launch or while on the transbrake?
We had found electrical interferrance on the main MSD wire, Too close to the coil wire or coil.
If it stutters on launch and you are not running a jet extension kit, then try raising the float level in the carb a bit and see if the condition changes.
other than that, make sure your MSD wire is not being shared with other components like the trans brake etc.
Also
Run a seperate ground to the head for your MSD