Fix of The Week 11/25/19
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: two check engine lights and a blown cigarette lighter fuse.
2009 Cadillac CTS – Kartunes Automotive Limited
This vehicle’s check engine light was on, code P0507 – Idle Speed High – Automatic Transmission.
I checked for external vacuum leaks but found none. Next, I removed the air inlet tube to inspect the throttle body (with the engine running) and could hear excessive vacuum from the breather hose. I removed the PCV orifice and found both holes had been drilled out. The customer said he read online that this will prevent oil from building up in the air intake tube and keep the engine “cleaner.“ I replaced the PCV orifice and the engine ran normally.
2010 Hyundai Genesis Coupe – Midas
This vehicle’s check engine light was on with codes P2187 & P2189 – fuel system lean at idle both banks. I found the long term fuel trim to be +20 on both banks at idle. It was normal off idle. I smoke tested intake and didn’t find any leaks. Since the data was screaming vacuum leak, I sprayed carb cleaner around the vacuum components. When the carb cleaner hit where the master meets the booster, the trims shot down to -30. The master cylinder had just been replaced and the sealing o-ring was omitted upon installation. The reason no smoke was seen is because the one–way check valve is built into this booster, making eliminating it during smoke testing impossible. I installed a new o-ring between the master cylinder body and booster.
2005 GMC Sierra 1500 – Market Street Auto Repair & Muffler
The 15 amp cigarette lighter fuse in the vehicle’s power distribution center would blow even after a new fuse was installed. I found there was no communication at the data link connector. I checked for a short to ground at the PDC cigarette lighter 15 amp fuse and determined it had shorted. I lifted up the PDC and snipped one of the two orange wires underneath. I eliminated the DLC short on the cigarette lighter side of that fuse and the battery voltage was then restored at pin 16 of the DLC. Communication was restored. I then ran a new power wire from the PDC to the cigarette lighter and restored that function as well. Problem solved.