Problem with Zex TC Window Switch part # 82085

Budman2K · #1 (**permalink**) 07-01-2009, 11:54 PM

I installed a Zex nitrous kit part # 82034 and a Zex Traction Control Window Switch part # 82085 in my 2006 Mustang GT and the window switch is giving me problems.

I have the green tach signal wire from the window switch soldered to the green wire of the # 1 coil on plug. I set the # 1 in the switch to "00" as stated in the instructions. When I start the car and at idle, the display on the switch becomes erratic and starts flashing random numbers. Also at idle when it does this it turns the first gear lockout off so the nitrous can spray when 3000 rpm's are reached and I am hoping at wide open throttle.

I have spoken to 3 different techs at Zex, but I don't think they understood what I was describing is happening.

Here is a video I uploaded to youtube so you can see it for yourself, keep an eye on the lockout light and notice it goes off about half way through the video.

I hope there is a simple solution to this problem so I don't waste more time and $ shipping the switch back and forth if it is not defective.

Thanks in advance for any help you can provide.

ZEX Man · #2 (**permalink**) 07-02-2009, 10:56 AM

We have found on some vehicles that the ignition coils have a "dirty" low rpm signal. This "dirty" signal can cause the erratic low rpm display like your video shows. While the installation instructions do not mention it, we have found that triggering the window switch with the fuel injector, instead of the ignition coil, tends to give a "cleaner" signal and has often times eliminated the rpm display flashing issue your video shows.

Hope this helps!

Budman2K · #3 (**permalink**) 07-02-2009, 11:00 AM

Thanks for your response, I will definitely give that a try this morning and let you know the results.

Budman2K · #4 (**permalink**) 07-02-2009, 12:15 PM

Ok, I soldered the green tach wire to the # 1 fuel injector signal wire and at idle the problem seems to have dissapeared.

Now the problem is when I do light stabs on the gas pedal, it throws random #'s and once again shuts off the 1st gear lockout. I never revved above 2500 rpm and notice the diplay showed 6000 and 4000 and possibly 8000 when it shut the lockout off. You may need to select the HD on the video to see this, video once again blurry.

I have included another video so you can see what I am talking about. I am beginning to think a filter capacitor may be needed to clean up the signal further, what do you think? I also tried the tach signal coming from the ecu and the results were the same as the coil on plug.

Thanks again for the help, I hope we can get this working.

ZEX Man · #5 (**permalink**) 07-02-2009, 06:30 PM

I will discuss the issue with one of our electronics engineers and see what we can do to address this further. In the meantime, check how the green signal wire is routed through the engine bay. If it is bundled with or runs by other coils or their wiring, interference can sometimes be created that results in an erratic signal.

Budman2K · #6 (**permalink**) 07-02-2009, 11:31 PM

So far I have had the green tach signal wire hooked to the # 1 coil on plug, the # 4 coil on plug, the tach signal coming from the ecm that I have my shift light hooked to, and the # 1 fuel injector.

The fuel injector is the only one that the rpm's did not show erratic at idle on the window switch. When hooked to coil on plug # 4 the wire was through the firewall below the battery tray and soldered directly onto the coil wire so it was not near other coil wires.

I really appreciate you looking into this for me, and hope we can solve this problem.