What's that knock

[Matthew Little]

Truck has a knock around 1600-2000 rpms. Just under normal driving I get 1-15 deg of knock retard, but under 1/2 to wot no knock at all. I can hear when going slow up to my house,sounds like a lifter tick,but I have already checked ajustment. Any ideas?
Thanks, Matthew 92 ty

 

[kwick6]

Re: What's that knock

Truck has a knock around 1600-2000 rpms. Just under normal driving I get 1-15 deg of knock retard, but under 1/2 to wot no knock at all. I can hear when going slow up to my house,sounds like a lifter tick,but I have already checked ajustment. Any ideas?
Thanks, Matthew 92 ty

what chip and injectors?

 

[Matthew Little]

knock

knock

I have an atr pitbull street for 40's. The 40's were in the truck when I got it ,and some people I have talked to on the board said the would not be big enoungh, but I am running a 20g and can not get the truck leaned out. I am planning on going back to stocks, but did not get them when I got the truck.

 

[93ty475]

Re: knock

Re: knock

I have an atr pitbull street for 40's. The 40's were in the truck when I got it ,and some people I have talked to on the board said the would not be big enoungh, but I am running a 20g and can not get the truck leaned out. I am planning on going back to stocks, but did not get them when I got the truck.

my truck came with the same setup...are you sure they're 40 lb injectors? i think mine had a red stripe...someone said they dont work well on these trucks...i dont think its a "not big enough" issue...mine ran like #@$@# until i put some stockers back in and a stock chip....ran MUCH better then...

servando

 

[kwick6]

Re: knock

Re: knock

I have an atr pitbull street for 40's. The 40's were in the truck when I got it ,and some people I have talked to on the board said the would not be big enoungh, but I am running a 20g and can not get the truck leaned out. I am planning on going back to stocks, but did not get them when I got the truck.

Then I have no idea what the problem could be, sorry.

 

[Matthew Little]

knock

knock

Thanks anyway kwick6,It's not running like sh## but not up to what it should be,The thing went 8.60 with a dead intercooler pump, vac leaks out the as# and a bad coil,the 40's were put in shortly before I got it with a kb chip which I quickly took out, The gm book calls the sound an off square valve or spring,I wanted to put rollers on it so I haven't taken it apart yet.