383,11.1 motor,th400 4k convertor,9inch 4.10 gear,100 shot ,took 4 degrees of timming of base 27.breaking up bad in high gear.11.33 at 121,any help would be greatly appreciated.

 

anybody,please help!

 

45 views nobody has a opinion.I thought this was the place to go for advice.

 

What does the jetting look like? Plugs?

 

what do you mean by breaking up? Are you getting detonation? Sputtering? what?

 

cant tell if it missfiring or detonation,52n and 30f jets,plugs look good br8,the discoloration on the ground strap is real close to the base of the plug,ben told it should be in the middle.

 

If you are detonating you will have black specks on the white porcelain inside the plug. you may need a magnifying glass to see them.

You may have too much timing based on what your saying about your ground strap.

 

will i get a high speed miss,if running too rich.

 

maybe but it would be more likely if you were lean. An engine tends to be rich on all cylinders not just one. Check all your wires to make sure they are connected well. Did you check all of your plugs to see if they look similar?

 

Pull 2 more degrees of timing. What does the fuel ring look like?

 

yes,I checked all the plugs,it a ls motor 02 trans am,neever had any problems with the coils,if i pull to much timming that will just make the motor lazy,it wont hurt it,right.

 

fuel ring is not even all the way around.

 

Im running a msd timming twister,has anybody had any problems with these.

 

Cut the threads off the plugs and look at the base of the porcelain. It should look like someone drew a line around it with a dull pencil. If it's bigger than that it's too rich. If it's skinnier/non-existent it's lean.

 

I will do it tomorrow thanks.

 

ok,cut the plug had a dark brown circle on the bottom of the porcelain.havent figured out how to pos pictures,the thicknes of the circle about 1/8 .

 

Check all plugs and jet for the leanest plug. Try pulling .002-.003 out of it if that's the leanest plug. 1/8" fuel ring is too much.

 

Sounds like you need to verify jetting for leanest cylinder and pull some more timing.

 

should the color be a light tan,when the jetting is right on.

 

yes. it should be light and on the wide side. the thiner it is the leaner it is.