Fix Of The Week 11/18/19
Fix of The Week
Every week we’re posting our favorite head-scratchers and interesting mechanical issues submitted by our Direct-Hit customers.
For a chance to have something you’ve worked on appear as a Fix of the Week, and win a cool little prize for your shop, all you have to do is post your unique fixes in Direct-Hit. Just look up the vehicle you’re working on, click on Post Fix at the top right, then tell us the problem and what you did to fix it.
This Week’s Winners
On this edition of Fix of The Week: a Kia with a leak and two Chevys with wonky wiring.
2015 Kia Forte – Old Line Automotive
The vehicle came in with Code P0456– evap, a small leak. I removed the vacuum hose from the intake manifold to the canister purge valve, then I used the vacuum pump to apply the vacuum. I confirmed it held vacuum. Then I used the scan tool to command the purge valve open and confirmed it released vacuum, then reinstalled the hose.
Next, I raised the vehicle and removed the canister close to the valve hose at the canister and filter. I blew air through the solenoid and confirmed the air passed to the filter side. I used the scan tool to command the solenoid shut. Air would blow through with it shut. I reinstall the hosed to the canister from the closing valve and removed the line from the canister to the fuel tank and plugged it off. I removed the line from the canister to the engine and smoke tested the canister with the closing valve commanded closed. I found smoke leaking from the bracket mounting bosses on the passenger side of the canister. I replaced the evaporation canister and retested—all was fine.
2012 Chevy Cruze – Kingston Auto
The vehicle’s trunk would open randomly by itself. I removed the trunk trim panel that holds the button and looked for corrosion at the back of the button where the wires go in. You could also unplug the harness for the license plate bulbs and the button to verify it doesn’t open by itself anymore. It’s also a good idea to remove the battery in key fob to eliminate it being a faulty key fob. The problem was the trunk release button; it comes as a harness for license plate bulbs and the button is hardwired into the harness.
2008 Chevy Tahoe – Larry Harker’s Auto Repair
The vehicle had two codes: P0300 and P0171. The freeze-frame showed misfire on cylinders 5 and 7, closed-loop at 55 mph. The fuel trim for bank 1 was 28% and bank 2:-12%. It would only misfire on deceleration or very light throttle. The intake had recently been removed and the new electrical tape was on a few injector harnesses. I did not have any misfires in the bay and the fuel trims were perfect. I suspected a problem with the eco-mode cylinders 1-7 4-6 since the misfire only was present during that mode. I discovered the number 5 injector and number 7 injector connectors were swapped and verified with the wiring diagram. I switched the connectors and misfires and fuel trim are now perfect.