installed alcohol injection yesterday. everything went in and worked fine. did some tuning last night with no problems. got up today and noticed when my car is at idle it vibrates very bad. it shakes so much that it sounds like my dash is gonna fall of. as soon as i give a little throttle or am at cruising speeds it is normal. anyone have any idea what is wrong?

 

What kit do you have.Try disconnecting the power to the kit.
Also how did you mount your nozzle,possible leak?

 

the alky kit isn't spraying all the time is it? if not try bumping the idle to 1,200 rpms...

 

i've got the cooling mist kit. it starts spraying at 17 psi. i've disconnnected the power supply to make sure it wasn't spraying all the time and it still does it. the idle stays steady at 840-860 rpm like it did before, just now the car shake like a ****.

 

You gonna be at the meet tonight?

 

Are your plugs fould. Maybe from the tuning it was running to rich or you have a
boost leak

 

coolingmist kits are set to 10 psi. ARE YOU sure that it was set 17psi?
Check the plugs

 

yea i adjusted it to 17psi. i'll try the plugs. if it were the plugs wouldn't it run rough under throttle as well?

 

changed the plugs and checked for boost leaks and had none. it's still rough as hell. my dash is about to rattle out.

 

i have also noticed that the rattle greatly intensifies when i am first taking off. if i rev higher and release the clutch it doesn't do it, but at normal revs and letting out the clutch it makes it rattle more. could i have done something like break the balance shaft belt when i was tuning it?

 

here is data from logging my idle through a 2nd gear pull.

 

ok i've went all over the car. checked compression, timing, and boost leaks. everything seems kosher. i did however jack the car up and listen to it idle while underneath it(prolly not the safest thing to do) and there is a loud rattle/ticking sound coming from what sounds like the transmission area. this is the only thing that i can associate with the vibrations inside the car. from up top listening to the engine it sounds fine aside from the rattle/ticking that i can hear coming from the bottom. the vibrations from the engine seem normal too. it's just when under the car things seem wrong.

 

buy a automotive stethescope and use that to narrow down the mechanical issue....you can pin point the location of the noise...