I had a P0449 code so I changed purge and vapour canister valves, code shut off! Then I got a P0445 code and changed all my spark plugs and egr valve, bought new gas cap and still can't figure out what the problem is!

Replaced timing chains and phasers P0017 keeps setting. Data display exhaust cam is not reading flatlined.

I changed oil not long after the engine started to smoke. But the exhaust is not smoking well and no irregular sounds are heard from the engine.

I've got a car in the shop currently that is kicking my butt and I could use some input! 2013 Equinox LEA 2.4l FWD 179k miles. This car recently had the motor replaced for broken timing chains that destroyed the head, and then sat for nearly 9 months before it was sold (customer never paid, mechanics lien). It was finally sold and is now back, came in for some unrelated issues (brakes and thermostat) but noticed it during test drives. The vehicle will surge and misfire badly at idle in gear. It does this under a specific set of conditions, and it takes a while to replicate. Once replicated,… Read complete