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<blockquote data-quote="PoManNox" data-source="post: 25969" data-attributes="member: 8300">Could you have a bad batch of fuel?&nbsp; Low system voltage (bad/weak battery?).&nbsp;&nbsp; If you haven't disabled the auto stop/start, you need to do that ASAP.&nbsp; Get one of the hood switch bypass cables off the amazon machine for $10.In general, fuel trims should not be too positive or too negative, as in the ECM trying to add or take away fuel to compensate for a problem (like a vac leak, etc).&nbsp; &nbsp;&nbsp; MAF or MAP will usually throw instant codes and CEL if something isn't right with them.The common problems with the 1.5T are frozen or split open charge air coolers.&nbsp;&nbsp; They can get filled with PCV condensation and freeze.&nbsp;&nbsp; You do typically get MAF and MAP codes with that one though.&nbsp;&nbsp; These engines will not run without boost.&nbsp; You might get high idle limp mode at best to get you off the road.Another important parameter for these GDI engines is fuel pressure at the high pressure fuel pump.&nbsp;&nbsp; The HPFP is a fairly common failure point on GDI engines in general.Vacuum pump problems result in a brake pedal so stiff, you'll about poop your pants.&nbsp; Worse than that, the pump can bind and break the end off the exhaust cam.</blockquote>

[QUOTE="PoManNox, post: 25969, member: 8300"] Could you have a bad batch of fuel? Low system voltage (bad/weak battery?). If you haven't disabled the auto stop/start, you need to do that ASAP. Get one of the hood switch bypass cables off the amazon machine for $10. In general, fuel trims should not be too positive or too negative, as in the ECM trying to add or take away fuel to compensate for a problem (like a vac leak, etc). MAF or MAP will usually throw instant codes and CEL if something isn't right with them. The common problems with the 1.5T are frozen or split open charge air coolers. They can get filled with PCV condensation and freeze. You do typically get MAF and MAP codes with that one though. These engines will not run without boost. You might get high idle limp mode at best to get you off the road. Another important parameter for these GDI engines is fuel pressure at the high pressure fuel pump. The HPFP is a fairly common failure point on GDI engines in general. Vacuum pump problems result in a brake pedal so stiff, you'll about poop your pants. Worse than that, the pump can bind and break the end off the exhaust cam. [/QUOTE]

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