87_TA

Well just installed long tubes,mufflex Y and 4" and K/S is in the way of headers.
I'm using 7730 ecm and have K/S disabled anyway cause of solid roller. Do I need to put a resistor on the plug? Or should I keep the KS hooked to it? Does it need to be grounded?

Thanks for any help.

RBob

iTrader: (1)

Use a 3.9K ohm resistor from the knock sensor wire to ground. No SES lite then.

The actual sensor can be put elsewhere on the block. Some Astro vans had them on the rear area of the block where the bellhousing bolts on.

RBob.

JohnL

RBob,
How does the resistor do the trick then? I thought the knock filter gave some sort of PWM signal to the ECM, but I dunno why I thunk that Please disabuse me of my KS ignorance.

John

RBob

iTrader: (1)

Knock sensors are microphones. The knock filter filters the signal from the KS looking for things such as a rapid change in frequency and/or amplitude and high amplitude in a particular frequency range. If knock is detected the knock filter activates a signal that causes an ECM hardware counter to increment. As long as the signal is active the counter counts and we have knock counts (PA3). This signal is just high or low, no real encoding.

For the '730 ($8D) the code uses the ADC to measure the resistance of the KS. The 3.9K resistor matches the resistance of the KS. The $8D code runs another test which is to crank in timing (during PE) until knock is detected. This test can be disabled by setting the coolant temperature threshold at max.

Malfunction code 43 is the result if either check fails.

RBob.

87_TA

Thanks Rob,
The weird thing is I have not gotten a light yet? Currently I have the wire connected to the sensor but just lying on fender.
Well I'm gonna first try to find somewhere to mount it, If not off to get a resistor.

Thanks again.

OMINOUS_87

87_TA

Just relo the KS to the driver side of the block and then plug the passenger side. The driver side drain is plugged and doesnt serve any purpose. You will however have to extend the wiring for the KS.

That is what I did when I dropped in my 2210s, acrually its what most people do, about your only option.

87_TA

Thanks,I'll give it a look.
I could not find the resistor at radio shack, soo I had to wrap a rag around mine and run a ground wire to it to go racing.

TRAXION

Yea - read the long tube installation sticky that I wrote on the exhaust forum. It explains that you have to relocate the KS to the driver's side.

Tim

ski_dwn_it

87,

Why don't you just do what I do? Leave the knock sensor in the motor, leave everything hooked up, but just zero out the retard that is trys to pull?

That way you can see if you get counts, but it will never actually pull any.

I do not get any false knock with the long tubes on mine. Make sure you are not making contact with any metal, even when the motor rocks. I had to spring a few items on mine for clearance. These were with Hookers. But my setups is entirely different as far as chassis is concerned so, I can't give specifics...

87_TA

Thanks Guys,
I plan to relocate it soon as I feel like getting back underneath.