FiTech EFI system
Ok, so another piece in combating the dreaded RPM noise fault code.Even after all of the shielding I did on the coil pickup, coil pickup wire and O2 sensor, I would still occasionally get a RPM noise fault. I decided that this could also be coming from AC ripple coming from the alternator. My battery is in the trunk and even though I ran the wires for the Fitech all the way to the battery It's such a long run I didn't think that the filtering from just the battery was enough. I made this filter to help with the noise. I have included a couple of pictures of the oscilloscope trace for you guys to see.
The link that I bought was from Lowe's. It is 1/2" and costs about $5.00.
The wire that I used was 14 gauge house wiring.
The capacitor is a 8200 uf @ 35 volts (make sure you use one that is rated at 35 volts just to be safe)
When you wind the wire make sure you keep the wires close and tight.
The capacitor positive lead goes to the positive voltage input wire. Notice that I melted the insulation away and soldered the positive lead of the capacitor to it. I then slid heat shrink tubing over it.. The negative lead of the capacitor just has the purple wire on it that will go to gound.
I black taped the capacitor to the link and then used huge heat shrink to cover it. You probably won't be able to get heat shrink that large (I got mine from work) but you can just electrical tape everything up.
I mounted this just below the firewall (cable tied to the transmission dipstick tube) so you don't see it.
It is a few inches way from the harness connector DO NOT CUT THE HARNESS COMING OUT OF THE THROTTLE BODY, THIS WILL VOID YOUR WARRANTY, RATHER CUT THE WIRE ON THE PLUG THAT CONNECTS TO THAT HARNESS.
Pictures.
Ok, so another piece in combating the dreaded RPM noise fault code.Even after all of the shielding I did on the coil pickup, coil pickup wire and O2 sensor, I would still occasionally get a RPM noise fault. I decided that this could also be coming from AC ripple coming from the alternator. My battery is in the trunk and even though I ran the wires for the Fitech all the way to the battery It's such a long run I didn't think that the filtering from just the battery was enough. I made this filter to help with the noise. I have included a couple of pictures of the oscilloscope trace for you guys to see.
The link that I bought was from Lowe's. It is 1/2" and costs about $5.00.
The wire that I used was 14 gauge house wiring.
The capacitor is a 8200 uf @ 35 volts (make sure you use one that is rated at 35 volts just to be safe)
When you wind the wire make sure you keep the wires close and tight.
The capacitor positive lead goes to the positive voltage input wire. Notice that I melted the insulation away and soldered the positive lead of the capacitor to it. I then slid heat shrink tubing over it.. The negative lead of the capacitor just has the purple wire on it that will go to gound.
I black taped the capacitor to the link and then used huge heat shrink to cover it. You probably won't be able to get heat shrink that large (I got mine from work) but you can just electrical tape everything up.
I mounted this just below the firewall (cable tied to the transmission dipstick tube) so you don't see it.
It is a few inches way from the harness connector DO NOT CUT THE HARNESS COMING OUT OF THE THROTTLE BODY, THIS WILL VOID YOUR WARRANTY, RATHER CUT THE WIRE ON THE PLUG THAT CONNECTS TO THAT HARNESS.
Pictures.
