I have a 2006 Denali with a Zex wet 125 kit. I have had the system on for almost a year with no problems at all. It has started to throw a vehicle speed sensor, and TPS code randomly. You can drive along and it will act like you are taking your foot off the gas for a quick second then putting it back on. I can go 500 feet before it goes into “reduced engine power”, or it may go ten miles before it does it. If you turn the truck off and give it thirty seconds then it will start without the “reduced engine power”
I immediately changed the resistor that is in the TPS wire for the Zex system but that didn’t do anything. So then I cut the Zex TPS wire altogether and that didn’t work either. Any thoughts out there?

Cheers

Jon

 

thats different i never had any problems like that

 

what makes you think "reduced engine power" would be related to the N20 wiring? Are you running a WOT switch or are you pulling a TPS signal for activation (window switch)? I would think more along the lines of a bad or dirty VSS (I've had to take mine out and clean it in the past) or a failing TPS.

Chiltons will get you to the VSS, just don't touch the tip of it. Clean with carb cleaner and a clean rag. As for the TPS, when the truck is idling, the idle air counts should be around 28 if I remember correctly. If the counts are jumping around at idle, I'd say you found you issue.