strange knock WI

[Motohead1]

Ok i just installed a DIY water injection system and i am now running 17psi and 10degrees BTCIf i launch from a dead stop i get about 14-18 counts of knock. but if i roll just a little like 1ft per sec. and do a launch i get no knock at all? any sugestions?

 

[zerofreez]

Motor mounts?

 

[greathuskie]

it cant be real knock...

and if you were going 1 foot per second you would be going .68 mph, i would think you are rolling a little faster than that

 

[Motohead1]

Originally posted by greathuskie
it cant be real knock...

and if you were going 1 foot per second you would be going .68 mph, i would think you are rolling a little faster than that

Nope your wrong i am rolling no faster than 1 ft a sec. and whats this fake knock. hell if the ECU sees knock then its knock. I wonder where or if theres a VSS (veical speed sensor) on the car cause also as soon as i start to roll in nutral the idle goes up. hmmm I need to go threw the wring diagram and see what makes it do that.

 

[greathuskie]

the knock sensor can pick up other noises and think they are knock

 

[InferiorWang]

there is a such thing as "phantom knock" where the ecu misreads noises as knock. There's supposed to be a way to make it not see it, but it also screws up the ability to see real knock, too.

 

[Motohead1]

ok seems to be fixed now. WI now comes on at 4psi instead of 6 and base timming is dow to 8 instead of 10.

 

[kpt4321]

Well, yeah. 10 degrees of base timing BTDC is a LOT, unless you are running race gas....

I will only use 5-6 on my car, you don't need more than that.

There is a VSS, and two idle speeds. One is for stopped, one for rolling.


.....Kyle T.

 

[Motohead1]

Originally posted by kpt4321
Well, yeah. 10 degrees of base timing BTDC is a LOT, unless you are running race gas....

I will only use 5-6 on my car, you don't need more than that.

There is a VSS, and two idle speeds. One is for stopped, one for rolling.


.....Kyle T.

Since i run WI you need more base timing as the flame front burns longer so 7+ degrees is not uncomon. I f i keep it at 5 btc with WI then the flame burns so long that my EGTs get really high very quickly.

Hmmm is there a way to adjust the rolling idle? cause it shoots up to 1400 rpm as soon as i move. I adjusted the set idle with grounding the #10 pin on the diognostic and my stoped idle is fine its the rolling idle thats messed up. Thanks